EVALUATION OF PHYSICO-MECHANICAL PROPERTIES OF SOILS

Integrated shallow geophysical surveys


The complex of shallow-depth geophysical methods together with drilling of geotechnical wells to the depth of 4-6 m with selection of soil samples provides comprehensive information for drawing up the geotechnical conclusion for construction of buildings of the 1st category (houses, one-storey industrial constructions), including the design of electrical earthing.
The complex includes:
– multi-wave seismic exploration,
– electrometry by the VES method,
– GPR sounding,

Seismoacoustic measurements in wells

Borehole seismoacoustic methods of assessment of physical and mechanical properties of soils and rocks are used in surveys on large objects of industrial and civil engineering.
The main research method is vertical seismoacoustic profiling (VSP) with the excitation of pulses on the earth’s surface and the reception of oscillations by hydrophone receivers in wells with a depth of up to 35-40 m and filled with water.
On the basis of measurement the velocity of longitudinal and transverse waves propagation soil density, elastic modules, Poisson’s ratio are determined.

Borehole methods in combination with seismic exploration

Micro seismic log (MSL) and VSP methods are used to study elastic wave velocities in the upper part of the geology section in conventional seismic exploration, to assess the physical-mechanical properties of soils and rocks in the design of water intake wells, to clarify the geological structure of the section of non-metallic mineral deposits and building materials (sand, gravel, marl dolomite). The depth of the detailed dismemberment of the section consists of 100 meters or more. The estimation of forecast deformation and strength properties of soils – total deformation modulus, angle of internal friction, the specific adhesion is performed. The most effective application of VSP in a complex with data of shallow geotechnical seismic prospecting.