Experimental Determination of Shear Strength of Soil Subjected to Dynamic Loading
Abstract
Experimental Determination of Shear Strength of Soil Subjected to Dynamic Loading
Incoming article date: 28.11.2017This article presents the results of the experimental study of how the loading rate effects the strength characteristics of soft soils. As such characteristics, the shear strength of soil was used being equal to the magnitude of tangential stresses when the limiting state was reached. The magnitude of the shear strength is considerably dependent on the strain rate. The experimental determination of this dependence was performed using the method of dynamic penetration of an axisymmetric body into the soil. Along with that, a direct measurement of stresses acting tangential to the surface of the body during its penetration into the soil was effected. Experimental studies were carried out for the body being penetrated with the range of rates from 2 to 100 m/s. It has been found that within the range of rates from 2 to 10 m/s the magnitude of the shear strength of soil increases as the loading rate grows. Further, its magnitude starts decreasing and at the rate of over 95 m/s becomes negligible. This gives grounds to construe soft soils subjected to dynamic loading as a compressible liquid.
Keywords: limiting soil state, shear strength, soil strain diagram, strain rate, method of dynamic penetration, compressible liquid