Type of Soil Tests Required for Deep Foundations Soil testing is required for the deep foundation. It is necessary to ensure the bearing capacity of the soil to support the loads from the deep foundation. Deep foundations are the depth of foundation which is generally greater than two times the width of footing.
Direct Shear Test This test is conducted to estimated the effective friction angle of cohesionless soil. Nonetheless, there are correlations that are developed to evaluate the effective friction angle of cohesionless soil.
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A Standard Penetration Test (SPT) This test is performed to determine the cohesion (and consequently the adhesion) to determine the angle of friction (and consequently the angle of friction between soil and the pile and also the point of resistance) for each soil stratum of cohesionless soil of soil.
A Static Cone Penetration Test (CPT) This test is conducted to determine the cohesion (and subsequently the adhesion) for soft cohesive soils and to check with SPT results for fine to medium sands. For the strata encountering both cohesive and cohesion-less soils, both SPT and CPT tests are required.
Vane Shear Test This test is performed to the estimated undrained in-situ shear strength of impervious clayey soils.
Undrained Triaxial Shear Strength This soil test is carried out on undisturbed soil samples (obtained with thin-walled tube samplers) to determine cohesion and angle of internal friction for clayey soils.
Pressure Meter Test This test is performed to determine the stress-strain curve of horizontal loading. The equipment is either inserted into a predrilled borehole or a self-boring pressure meter is used. Unless the soil is isotropic, the same value cannot be adopted for the vertical direction. This test is performed specifically for piles that are subjected to lateral loading.
Ground Water Condition and Permeability of the Soil Groundwater conditions and soil permeability influence the choice of pile type to be recommended. Groundwater samples need to be tested to consider the possible chemical effects on concrete and the reinforcement. The result of the cone penetration test for the same soil shows substantial scatter. They need to be checked with supplementary information from other exploration methods. If you are looking for a soil testing company in New York, you can trust AAA Group.