Experimental Study on Strength Characteristics of Frozen Sands

The MTS-Landmark 370.10 dynamic and static triaxial test system is used to carry out low temperature conventional triaxial tests at a temperature of -10 ° C and the confining pressures of 0.5MPa, 1MPa, 2MPa, 6MPa, and 8MPa to study the strength characteristics of frozen sands. The test results show that under different confining pressures, the stress-strain curves of frozen sand are strain soften. With the increasing confining pressures, the degree decreases gradually, and the strength has a non-linear characteristic. Based on the envelope theorem, a non-linear strength criterion is proposed in this paper. Compared with the test results, the strength criterion can well describe the non-linear relationship between the strength of frozen sand and confining pressure.