Our Infrastructure services

  • Road & Highway
  • Buildings
  • Bridge, flyovers, Underpass

Design of structure

We provide services ranging from simple structural design to prime professional with total project responsibility through construction. Projects include office buildings, schools, hospitals, and heavy industrial structures.

Services Provided:

  •     Structural design
  •     Devising technical specifications
  •     Preparing construction drawings
  •     Bill of quantities and estimation of cost, analysis of rates
  •     Building design
  •     Drafting services
  •     Building Inspection-Structural
  •     Project development
  •     Quality Control / Assurance Services
  •     Instrumentation for performance evaluation
  •     Preparation of tender documents

Soil Nailing

Soil nailing technique

NSS Engineers & Geotechnical Services is please to be the consultant for execution and to design the soil nailing technique for stabilization of the natural or manmade soil slope. We have been regularly using this technique for the stabilization of the soil slope in different challenging environments with satisfactory approach. The theory of the soil nailing and its application is discussed below for observation and consideration of the facts of this technique. It is completely our pleasure to take an opportunity for implementing the applications of this technique.

The soil nailing is the technique which is use to reinforce the existing ground by increasing the normal loads (and hence the shear strength) on potential sliding surfaces through the nails, which is simply consist of steel tendon, but most commonly the tendon is encapsulated in a cement grouted body to provide corrosion and improved load transfer to the ground.

It is an effective an economical method to stabilize the excavated soil face or landslide zone. Soil nail technology was first used in France to build a permanent retaining wall cut in soft rock, whereas the first soil nail wall to use modern soil nailing techniques was built near Versailles in 1972. After that it has been common methodology for the stabilization of the soil mass in different applications. Destabilization of the soil mass caused by the increase in tensile force compare to the compressive force or normal force (resisting force). In this technique nails work predominantly in tension but are considered by some work also in bending/shear in certain circumstances. The effect of the nail reinforcement is to improve stability by a) increasing the normal force and hence the soil shear resistance along potential slip surfaces in frictional soils and b) reducing the driving force along potential slip surfaces in both frictional and cohesive soils. A construction facing is also usually required and is typically shotcrete reinforced by welded wire mesh. In soil nailing, the reinforcement is installed horizontally or sub – horizontally, which would be approximately parallel to the direction of major tensile straining in the soil to minimize the tensile force and to maximize the resisting potential of the soil mass through nail-ground interactions.

Best suited conditions for soil nailing

  • In general, the economical use of soil nailing requires, the ground has to be stand unsupported in a vertical or steeply – sloped cut of 1 to 2 m in height for one to two days.
  • In addition, it is highly desirable that an open drill hole can maintain its stability for at least several hours neither the execution of the work would be more challenging.
  • Geologically the best suited conditions for soil nailing would be characterized as the stiff to hard fine-grained soils which include stiff to hard clays, clayey silts, silty clays, sandy clays, and sandy silts are preferred soils.
  • Sand, gravels, cobbles, pebbles and boulder, which are dense to very dense soils with some apparent cohesion also work well for soil nailing.
  • Weathered rocks is also favorable for soil nailing while it would be weathered throughout and there should not be the weak planes.
  • The soil which has been deposited by glacial event is also favorable for soil nailing.

Design of soil nailing

Design of soil nailing for stabilization of respective soil mass could be executed with two approaches i.e. the selection of limit states and design approaches. Again there are two common limits has to be considered i.e. strength limit and service limit states. The strength limit state is the limit state that addresses potential failure mechanisms or collapse states of the soil nail wall system. The service limit state is the limit state that addresses loss of service function resulting from excessive wall deformation and is defined by restriction in stress, deformation and facing crack width under regular service conditions.
In design approaches the initial design considerations include wall layout (wall height and length), soil nail vertical and horizontal spacing, inclination of soil nail, length of soil nail and distribution, soil nail material and relevant ground properties. After considering these all parameters the design engineer has to be evaluating the nail length and maximum nail force. Nail length, diameter and spacing typically control external and internal stability of the wall. These parameters could be adjusted during design until all external and internal stability requirements are met. After the initial design is completed, final design progresses where the soil nail wall has to be tested for external and internal failure modes, seismic considerations and aesthetic qualities. Drainage, frost penetration and external loads such as wind and hydrostatic forces also have to be determined and included in the final examination of the design.

Construction of soil nail

With the design complete, the execution of the soil nailing and the construction of soil nail wall is the next step. Most soil nail wall construction follows a specific procedure. Its construction process is faster than other similar methods. The construction process start by cutting the soil face, which would be approximately vertical and after that put the temporary bracing at that excavated soil face, if necessary. This can be manually performed or can be used earth moving equipment. After that start the drilling into the soil, where the nail, steel bar, is going to be placed. The holes for the soil nails are drilled at predetermined locations as specified by the design engineer. The equipment used for this step is dependent on the stability of the material in which the soil nail is supporting. After inserting the nails into drilled holes, it must be grouted into the soil to create structure similar to a gravity wall.
With the holes drilled, the next step is to install and grout the nails into place. After all nails are inserted, a drainage system is put into place. Synthetic drainage mat is placed vertically between the nails heads, which are extended down to the base of the wall where they are most commonly connected to a footing drain. A layer of shotcrete is applied and bearing plates are installed before a final facing is put in place to complete the soil nail wall. Variations of the steps described above may be necessary to accommodate additional preparation tasks or supplementary activities for specific project conditions.

Advantage of soil nailing

  •  It is cost effective over other alternatives for stabilization of the natural soil slope or any man made excavated soil face.
  • It has a less impact on environment and the other natural phenomena because of the minimum excavation and backfilling of the respective region.
  • The method is well-suited to sites with difficult or remote access because of the relatively small size and the mobility of the required construction equipment.
  • The method is also well suited to urban construction where noise, vibration and access can pose problems.
  • Minimize right-of-way requirement.
  • Can be used as both temporary and permanent support

Application of soil nailing

  • Providing an earth retention system for deep excavations
  • It can be useful to create permanent retaining walls.
  • This has been regularly used for stabilizing slopes and landslide.
  • It can also be used for natural hillsides stabilization and disturbed terrain.
  • It can be used to stabilize the man made soil cut slopes.
  • It would be helpful to preserve the natural areas.
  • Supporting and strengthening ground around tunnel excavations.

Project Management Services

Our experienced staff has diverse technical and management skills., Testing and Research Services to the Civil Engineering Profession and Geotechnical Engineering in particular. We specialise in providing Geotechnical Consultancy for Hydro Projects.

We also provide project management consultancy services which include supervision of work in accordance with technical specifications, preparation of running account bills, final bills, Interaction with the clients and contractors.

Services Provided:

  •     Supervision/Inspection of Construction
  •     Quality Control/Assurance services for all civil engineering Projects
  •     Preparation of specifications and Procurement of Equipments
  •     Civil Works Rehabilitation
  •     Estimation and Bid Evaluation
  •     Preparation of tender documents
  •     Project Monitoring & Evaluation
  •     Training and knowledge dissemination to Project staff

Laboratory Testing

We feature in-house capabilities to provide laboratory testing of soil, rock, concrete, coarse & fine aggregates, mortar, bricks, tiles etc. We follow current BIS test procedures for tests conducted by our firm, and stay abreast of changes in methods along with new procedures through our membership in the Bureau of Indian Standards (BIS). For tests not covered by BIS, International Standards are followed. Laboratory test results are issued in concise computer generated formats and graphics with supplemental data acquisition reports available upon request. Our in-house laboratory testing capabilities are summarized as follows:


  •     Gradation Analysis
  •     Grain Size Distribution
  •     Atterberg Limits
  •     Unconfined Compressive Strength
  •     Direct Shear Test
  •     Triaxial Shear Test
  •     Consolidation
  •     Permeability
  •     Density and Specific gravity
  •     Relative Density
  •     CBR
  •     Proctor Compaction
  •     Determination of Total Soluble Solids, Organic Matter, Calcium Carbonate, Cation Exchange Capacity, pH Value and Total Soluble Sulphates
  •     Characterization of Expansive, Soft, Sensitive & Dispersive Soils

Intact Rock & Rock Joints

Intact Rock

Rock Joints

  • Uniaxial Compressive Strength
  • Modulus of Elasticity and Poisson’s Ratio
  • Triaxial Compression Test
  • Tensile Strength - Direct & Indirect (Brazilian Method)
  • Flexural Strength
  • Point Load Strength Index
  • Hardness
  • Slake Durability Test
  • Swelling Index Test
  • Direct Shear Test
  • Permeability
  • Petro graphic Examination
  • Index Properties



  • Specific Gravity
  • Water Absorption
  • Gradation
  • Gradation
  • Aggregate Abrasion Value
  • Soundness
  • Petrographic Examination
  • Crushing Strength
  • Alkali – Aggregate Reactivity
  • Chemical MethodMortar Bar Method
  • Accelerated Method
  • Flakiness Index
  • Elongation Index
  • Elongation Index
  • (coal & lignite, clay lumps, material finer than 75 micron IS sieve , soft fragments & shale) 


  • Specific Gravity
  • Water Absorption
  • Gradation & Fineness Modulus
  • Material finer than 75 micron IS sieve
  • Bulking
  • Soundness
  • Mortar Making Properties
  • Organic Impurities
  • Petrographic Examination
  • Mica Content
  • Alkali Aggregate Reactivity
  • Chemical Method
  • Mortar Bar Method
  • Accelerated Method


  • PH Value
  • Volume of 0.02 normal NaOH to neutralize 100ml sample of water, using phenolphthalein
  • Volume of 0.02 normal H2So4  to neutralize 100 ml sample of water using mixed indicator
  • 28 days compressive strength of concrete cubes with water against distilled water
  • Initial setting time of cement & water against that of cement & distilled water
  • Organic impurities
  • Inorganic impurities
  • Sulphates ( as SO3)
  • Chlorides (as Cl )
  • Suspended matter


  •  Water Absorption
  • Aggregate Abrasion Value
  • Aggregate Impact Value
  • Initial Void Ratio
  • Coefficient of Compressibility
  • Coefficient of Uniformity
  • Breakage Factor
  • Coefficient of Permeability
  • Density
  • Shear Parameter


  • Chemical Composition(Carbon, Sulphur,Phosphorus, Sulphur&Phosphorus)
  • Nominal mass per meter
  • 0.2 percent proof stress
  • yield stress
  • Percentage elongation
  • Tensile strength
  • Bond strength
  • Rebound test


  • Dimensions
  • Water Absorption
  • Compressive strength
  • Efflorescence
  • Warpage


  • Dimensions
  • Flexural Strength
  • Abrasion Resistance

Geotechnical Engineering

Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. Geotechnical engineering includes investigating existing subsurface conditions and materials; assessing risks posed by site conditions; designing earthworks and structure foundations; and monitoring site conditions, earthwork and foundation construction.

Construction project reviews have consistently shown a major factor in delay and cost overrun to be the unforeseen conditions in the ground. The provision of solutions requires a thorough understanding of soil, rock and groundwater interactions.

Cost-effective site investigation, combined with experienced interpretation of the data collected, is an essential element of project risk assessment and management.

We provide complete feasibility assessment, design and project management service in all aspects of ground engineering, we are able to combine knowledge with experience to provide cost effective solutions.

We provide the following Field Testing Services:- SOIL INVESTIGATION:

  •     Drilling and Sampling
  •     Bore Hole Logging
  •     Field Permeability Test
  •     Standard Penetration Test
  •     Static Cone Penetration Test
  •     Dynamic Cone Penetration Test
  •     Vane Shear Test
  •     Bearing Capacity of Foundation
  •     Plate Load Test
  •     Liquefaction Studies
  •     Pressure meter Test
  •     Modulus of Sub- grade Reaction (K-Value)
  •     California Bearing Ratio


  •     Drilling and Sampling
  •     Bore Hole Logging
  •     Field Permeability
  •     Modulus of Deformation/ Elasticity
  •     In-situ Shear Test
  •     In-situ Stress Measurement
  •     by Flat Jack Technique/ Hydraulic Fracturing Technique
  •     Pull Out Test of Rock Bolts/Anchors
  •     Monitoring of Rock Movements
  •     Geophysical Investigations
  •     Seismic Refraction Test
  •     Seismic Reflection Test
  •     GPR Investigations
  •     Gross hole, up hole & down hole tests
  •     Electrical Receptivity Test
  •     Sonic Tomography


Concrete Technology is a vital technical input relevant to any large civil engineering concrete construction project. NSS pay personnel are experts of national repute in the fields of structural engineering, concrete technology & Construction materials. Some of the prominent activities are listed below:

  •     Construction Materials Survey for Hydroelectric and Irrigation Projects
  •     Non- destructive testing for evaluation of quality of concrete
  •     Drilling out concrete cores for laboratory testing
  •     Inspection and safety evaluation of old dams, powerhouses and other hydraulic structures
  •     Setting up of field quality control laboratories
  •     Supervision and execution of quality control
  •     Temperature control studies on mass concrete for dams & other massive structures

NSS laboratory personnel are having more than a decode of experience in evaluation of construction materials, design of concrete & mortar mixes, laboratory & setting up of laboratories, specialized tests on concrete etc.

  •     Laboratory testing of construction material such as cement, pozzolana, chemical & mineral admixtures, coarse aggregate, fine aggregate, mixing and curing water, bricks, tiles, masonry, stone, etc.
  •     Design of structural grade concrete, mass concrete, high performance concrete, self compacting concrete, high strength concrete
  •     Design of gunite /shotcrete /steel fiber reinforced shotcrete mixes
  •     Design of epoxy resion /poly urethane mortar & epoxy resion /polymer concrete mixes
  •     Design of colcrete & colgrout masonry
  •     Tests on hardened concrete
  •     Alkali aggregate reaction studies
  •     Laboratory studies on Roller Compacted Concrete Mixes
  •     Specialized tests on concrete such as evaluation of creep & shrinkage parameters

Geological Investigation

Geological investigation is a very much important part in civil engineering as well as in infrastructure development. With an ever increasing demand for housing and development of infrastructure, the surface and subsurface geological condition has widely been considered as an important parameter. NSS Engineers & Geotechnical Services takes an opportunity to perform all types of geological investigations using advanced and highly recommended tools.

The list of Geological investigations are given below –

  •     Geological mapping.
  •     Structural mapping.
  •     Geomorphological mapping.
  •     Preparation of Geological reports
  •     Geological interpretation using Geophysical tools
  •     Preliminary Geological investigations for Civil Engineering projects.
  •     Sub surface geological investigations using recommended tools.

Geophysical Survey

The application of Geophysics to challenging geologic, environmental, engineering, or other scientific problems provides an alternative, often unique, insight into the subsurface unlike more conventional assessment methods such as drilling. NSS offers its clients site investigation strategies that reduce the likelihood of overlooking unexpected subsurface conditions while enhancing the understanding of subsurface site characteristics. The expertise of the NSS Geophysical professionals makes it possible to provide our clients with high quality services to address a wide spectrum of needs and situations. Geophysics can enhance investigation of an enormous range of projects including such diverse examples as dams and underground powerhouses, storage tanks, environmental site assessments, determining depth to rock and mapping subsurface features in geotechnical investigations, fracture and aquifer mapping in hydro geologic investigations, providing detailed stratigraphic data in coal exploration, and locating burials and artifacts in archaeological studies. NSS offers a diversity of surface and borehole geophysical methodologies. With the rapid growth of information and digital technologies, high quality, routine, and cost-effective applications of sophisticated geophysical methods have become possible. NSS has dedicated itself to being a leader in effectively delivering geophysical services in this rapidly evolving, high-tech field. NSS is committed to providing its clients with high quality geophysical surveys and professional reports written in a manner that emphasizes NSS's understanding of each client's chief concerns.

Services Offered Include:

  •     Seismic Refraction Test
  •     Seismic Reflection Test
  •     Cross Hole, Up Hole & Down Hole Tests
  •     Electrical Resistivity Test
  •     Sonic Topography

GPR Investigations

  •     Detection of Buried Utilities
  •     Geotechnical Investigations
  •     Environmental Investigations
  •     Tunnelling & Underground Caverns
  •     Archaeology
  •     Mining & Quarrying
  •     Defense Applications

Slope Stabilization

Slope stabilization poses some of the most complicated design and construction challenges in our industry. Our knowledge of geological conditions and sensitivity to the environment allows us to specialize in difficult stabilization installations, such as unpredictable excavation support, unusual terrain, and infrastructure interference in either rural or urban settings.

In addition to quick response to our clients’ needs, NSS offers technical skill in design & and construction covering:


  •     Reinforced Earth
  •     Soil Nailing
  •     Micro pile Stabilization
  •     Structural and Architectural Shotcrete
  •     Silica fume steel fiber reinforced shotcrete
  •     Ground Improvement by Grouting
  •     Rock Bolting/Anchoring
  •     Application of Geogrids


(A)Cohesion less Soils:

  •     Vibro Compaction
  •     Dynamic Compaction
  •     Compaction Piles
  •     Compaction Grouting
  •     Jet Grouting Grouting (Soil, Cement, Lime, Chemical)
  •     Use of Geofabrics
  •     Reinforced Earth
  •     Blasting

    (B)Soft Clays

  •     Preloading
  •     Stone Columns
  •     Use of Geofabrics
  •     All Types of Soils
  •     Use of Micro piles
  •     Under Reamed Piles

    (C)Expansive Soils:

  •     Moisture Control
  •     CNS Layer
  •     Lime Stabilization

Dispersive Soils:

  •     Lime (Gypsum) Treatment

Our Services

Topographic surveying involves the production of maps and plans, which are true to scale. Topographic maps are produced to accurately represent details of both the natural and built environment. They will also include symbols representing features or data too small to produce to scale.

Our Survey team regularly carries out high standard site surveys for our clients. Topographical and Site Surveys are directed towards planning and design for engineering purposes.

We provide services for small and large scale    topographical surveys customized to the clients’    needs.

Areas Covered:

  •     Hydro Electric Projects
  •     Water Resources Projects including Canals, Aqueducts, Superpassages, etc.
  •     Concrete, Earth and Rockfill Dams
  •     Tunnels and Underground Powerhouses
  •     Thermal Power Stations
  •     Highways and highway structures
  •     Railways and rail structures
  •     Industrial Complexes
  •     Remote surveying. i.e. surveying without the need to visit inaccessible or dangerous points such as overhead cables or open motorway carriageway
  •     Cross section surveys such as river cross sections or rail embankment sections
  •     Types of Survey Handled:
  •     Topographical Survey for new sites including taking details of external boundaries, reconciling
  •     with land records, covering details of features within the area, contour details & working out exact area.
  •     As Built/ Constructed Structure for studies & documentation of existing structures to observe exact deformation in all directions.
  •     Construction Survey during execution/ commissioning of projects for providing exact lay outs,vertical controls & supervising dimensional control at high elevation by use of latest equipment.

Pile Testing

NSS provides site pile testing and pile condition reporting services to the construction industry. These services include Pile Integrity Testing (PIT); Cross Hole Sonic Logging; Pile Length Measuring and consultancy on the capacity and serviceability of piles. We use the latest site testing equipment and analysis software to provide a fast, efficient and cost effective service.

Pile Integrity Testing (PIT)

Defects in concrete piles caused either during or after construction may seriously affect their performance in service. Load testing of piles may be used to check the assumptions adopted in the load capacity design of the piles. However, it is too expensive and time consuming to use load testing as a means of checking workmanship. Modern non-destructive methods based on small strain impulse techniques enable the integrity of all the piles on a site to be established rapidly and economically to enhance confidence in the foundation. The test is performed using a portable, battery powered unit which requires no backup vehicle or vulnerable cables across site that disrupt normal construction activity. The test equipment is based upon the most modern digital data acquisition and signal processing techniques currently available, thus maximising the resolution and effectiveness of the test system. In excess of two hundred piles per day may be tested with this unit, depending on access and pile head condition.

Cross Hole Sonic Logging (CHSL)

The CROSS-HOLE SONIC LOGGER is used to detect defects in concrete structures and in other solid structures such as rock or concrete-rock interfaces. Defects that may be detected using sonic logging include: honeycombing; segregation due to improper concrete placement methods; washout of cement due to groundwater flow; cracks in pile shafts due to shrinkage; inclusion of foreign material causing contamination of concrete; necking and arching of piles due to collapse of side walls during withdrawal of temporary liners.

Vibration Monitoring & analysis of vibrations for optimisation of hammer parameters for compaction of soils, at power house sites due to turbo-generators, during driving of sheet piles, due to traffic in rock mass , in abutments due to movement of overhead trolleys & for assessing safety of constructed due to vibrations imposed by blasting etc.

Repair and Rehabilitation

Structural Repair Strategies:

Our core capabilities include the identification and design of thoroughly-formulated structural repair strategies for building facades, high-rise commercial office buildings, public buildings, high-rise residential buildings, industrial plants, civil structures, masonry and concrete dams, bridges fire-affected structures etc. We also undertake recommendation of restoration & repairs measure of Heritage buildings and structures Our work includes concrete, brick/stone masonry & steel structures. We also solve building roof waterproofing problems through the use of various types of roof membrane systems.

Use of Latest Concrete Repair Materials and Equipment:

NSS has access to the latest technology in both concrete repair and related materials and the necessary equipment, enabling us to solve clients' maintenance and repair problems through integrated solutions tailored to the short, immediate or long term measures as appropriate

NSS is dedicated to creating value for its asset management customers by utilising best practices, methods and technology to solve structural repair and restoration problems being forced by owners and managers