ESTIMATION METHOD FOR UNIAXIAL COMPRESSIVE STRENGTH

摘要

PROBLEM TO BE SOLVED: To provide a method for estimating uniaxial compressive strength of soil from a measurement value in rotating penetration test.;SOLUTION: In penetration test for, when rotating a penetration rod having a screw point 3 at the front end to penetrate into a ground, measuring rotation torque T of the penetration rod while stepwise changing a load W applied onto the penetration rod, a relational expression between horizontal shearing stress τ_h working on the surface of the screw point 3 and the rotation torque T is found on the basis of the size of the screw point 3. In the state that the load W applied onto the penetration rod is zero, the horizontal shearing stress τ_h corresponds to shearing stress τ working on the surface of the screw point. Thus, on the basis of the relational expression, a relational expression between the shearing stress τ working on the surface of the screw point 3 and the rotation torque in the state of the zero load is found, and a Mohr's stress circle theory is applied to the relational expression to calculate the uniaxial compressive strength of soil.;COPYRIGHT: (C)2014,JPO&INPIT