Geotechnical Survey

Geotechnical investigations in Kenya & East Africa

Geotechnical investigations have become an essential component of every construction to ensure safety of human beings and materials. It includes a detailed investigation of the soil to determine the soil strength, composition, water content, and other important soil characteristics.

Why are Geotechnical Surveys Needed?

Geotechnical investigations are executed by geotechnical engineers and geologists to acquire information regarding the physical characteristics of soil and rocks. The purpose of geotechnical investigations is to design earthworks and foundations for structures, and to execute earthwork repairs necessitated due to changes in the subsurface environment. A geotechnical examination includes surface and subsurface exploration, soil sampling, and laboratory analysis. Geotechnical investigations are also known as foundation analysis, soil analysis, soil testing, soil mechanics, and subsurface investigation. The samples are examined prior to the development of the location. Geotechnical investigations have acquired substantial importance in preventing human and material damage due to the earthquakes, foundation cracks, and other catastrophes. Geotechnical investigations can be as simple as conducting only a visual assessment of the site or as detailed as a computer-aided study of the soil using laboratory tests.

Geotechnical Investigations Include:

Disturbed soil sampling

Disturbed soil sample is the most common method of soil sampling. There are several techniques of soil sampling. The choice of the most appropriate way depends on the purpose of the sampling & the subsequent use of the samples.

Soil laboratory testing

Our soil testing programmes are crucial to projects with great sensitivity to soil behaviour - high-rise buildings, bridges, dams, power plants, mines, levees, offshore platforms and tunnels, for example.

Dynamic Cone Penetration (DCP) Testing

Used to measure the strength of in-situ soil and the thickness and location of subsurface soil layers. It is similar to CPT in that a metal cone is advanced into the ground to continuously characterize soil behavior.

Vane shear testing

Vane shear testing is one of the most common in-situ methods for the estimation of the undrained shear strength of the soil. Excellent for profiling shear strength when used in combination with the CPTu or full flow penetrometer.

Undisturbed soil sampling

Undisturbed soil core samples are taken to determine many basic soil physical properties. The relative volumes of the solid, liquid and gaseous phases can be determined either by mass or by volume.

Seismic Cone Penetration Testing (SCPTu)

Used in the determination of low strain in-situ compression (P) and shear (S) wave velocities. The determination of P-wave and S-wave arrival times from the recorded time series is of importance to the evaluation of seismic wave velocities.

Dynamic Penetration Tests (DPT)

Provides a measure of a material’s in-situ resistance to penetration. The test is performed by driving a metal cone into the ground by repeated striking it with a 17.6 lb (8 Kg)weight dropped from a distance of 2.26 feet (575 mm).

Piezo-cone Penetration Testing (CPTu)

CPTu is a in situ testing method used to determine the Geo-technical engineering properties of soils & assessing subsurface stratigraphy, relative density, strength & equilibrium groundwater pressures.

Other Services Include:

Piezo-cone Penetration Testing (CPTu)

CPTu is a in situ testing method used to determine the Geo-technical engineering properties of soils & assessing subsurface stratigraphy, relative density, strength & equilibrium groundwater pressures.

Ground Water Investigations

The investigations consist of measuring of groundwater table level, hydraulic head at different depths and total rainfall. The results of these investigations are used for estimating the amount of rainwater infiltrating into the bedrock and the properties of flow paths inside the rock.

Piezometers Installation & Monitoring

Piezometers are used for measuring pore pressures in ground.
Pore pressure has fundamental importance to understanding ground behaviour, before—during—and after construction.

Dam Safety Studies

Saturation determination in dam body.

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