Geotechnical investigations are performed by geotechnical engineers or engineering geologists to obtain information on the physical properties of soil earthworks and foundations for proposed structures and for the repair of distress to earthworks and structures caused by subsurface conditions.
A geotechnical investigation will include surface exploration and subsurface exploration of a site. Sometimes, geophysical methods are used to obtain data about sites. Subsurface exploration usually involves soil sampling and laboratory tests of the soil samples retrieved.
To obtain information about the soil conditions below the surface, some form of subsurface exploration is required. Methods of observing the soils below the surface, obtaining samples, and determining physical properties of the soils and rocks include test pits, trenching, boring, and in situ tests.
- Drilling of boreholes through all types of soil, rock, bouldery strata ( Diameter: 75-150, HX & PX size)
- Collection, testing and preservation of soil, rock & water sample.
- Standard Penetration Test ( N value)
- Dynamic Cone Penetration Test
- Plate load Test (PLT )
- Pile Load Test
- Field California Bearing Ratio (FCBR)
- Electrical Resistivity Test (ERT)
- Measuring the depth of Groundwater Table
SUBSURFACE DRILLING IN SOIL/ROCK
Soil/Rock investigation will be done to determine the depth and characteristics of the different subsurface formations, the required foundation depth, the most suitable and economical type of foundations, the allowable bearing capacities and expected settlement for the proposed structures along with the guidelines for earthwork construction specifications, cement type, backfill and other geotechnical recommendations.
The soil/rock investigation will be made as follows:
- Drilling the required number of boreholes till the required depth in all types of formations encountered.
- Engineering analysis will be made and detailed design criteria shall be provided to design the safe and economical foundation for the structures based on the in-situ and laboratory testing and findings.
We provide a wide range of survey services, including pipeline, construction, topographic / pre-engineering, and cadastral surveys.
Land surveying, land information and data management are services needed for a number of industries involving land development, resource exploration/development, telecommunications and engineering.
Differential Global Positioning System (DGPS)
The SP80’s Z-Blade GNSS-centric technology delivers fast and reliable GNSS positioning utilizing all available GNSS signals to produce the optimal solution even in challenging environments. GPS-only, GLONASS-only or BeiDou-only positioning modes are available when necessary. This instrument is created by Spectra Geospatial’s engineering design lab in Germany. With a 99.9 percent reliability, it features an instant RTK initialization that comes with a range of up to 24 miles. Data processing is also fast with this receiver with its 0.05 to 999-second recording interval.
The SP80 is the most reliable, durable and productive system to get the job done.
We are conducting this survey by using latest and fool proof techniques and instruments like; Electronic Total- station equipment and Auto-levels having following precision specifications.
Angle-measurement up to 0.1” of arch and distance up to 2.5 Km. To a single prism to an accuracy of 2mm+2ppm recording automatically all measurements into GRE4 alphanumeric.
Geophysical investigations required for foundation studied of any structures like dam, Power plants, high rise building, towers, and bridges, and underground structures etc.
Further by Geophysical tests (Seismic refraction test, Cross-hole/ Downhole/ Tomography seismic) we can obtain bedrock quality & overburden thickness, Fracture, fault, weak zone identifications, determination of dynamic properties of strata, seismic velocities.
Hydrological investigations are required for obtaining the parameters of ground water and designing of tube wells. This investigation is required for planning of township, industrial projects. We are executing this test by latest equipment’s (resistivity sounding method) and by the expert Hydro-geologists.
PLATE LOAD TEST
Plate Load Test is a field test for determining the ultimate bearing capacity of soil and the likely settlement under a given load. The Plate Load Test basically consists of loading a steel plate placed at the foundation level and recording the settlements corresponding to each load increment.
A test pit is dug at site up to the depth at which the foundation is proposed to be laid. The mild steel plate (also known as bearing plate) used in the test should not be less than 25 mm in thickness and its size may vary from 300 to 750 mm. The plate could be square or circular in shape. Circular plate is adopted in case of circular footing and square plate is used in all other types of footings. The plate is machined on side and edges. The load is applied to the test plate through a centrally placed column. The test load is transmitted to the column by one of the following two methods:
(i) By Gravity loading or reaction loading method
(ii) By loading Truss Method
FIELD CALIFORNIA BEARING RATIO
The California bearing ratio test is penetration test meant for the evaluation of subgrade strength of roads and pavements. The results obtained by these tests are used with the empirical curves to determine the thickness of pavement and its component layers. This is the most widely used method for the design of flexible pavement.