Experimental study on basic mechanical behaviors of sandy mudstone under low freezing temperature

Abstract

In order to get the basic mechanical properties of sandy mudstone for the investigation, water-saturation rock samples were tested by uniaxial and triaxial compressive tests under different temperatures (-30-20℃) and different conditions of confining pressure (6, 8, 10 MPa). The effect of low temperature on the basic mechanical parameters of sandy mudstone was analyzed, and compressive strength and residual strength were discussed along with the change of the confining pressure test. The results show as follows: low temperature (below 0℃) has great influence on strength properties and deformation characteristics of sandy mudstone, and compressive strength, cohesion, internal friction angle, residual strength and elastic modulus increase with the decrease of temperature; residual strength has an attenuation increasing trend, and the maximum axial strain decreases with the decrease of temperature. Confining pressure has great influence on strength characteristics of sandy mudstone, and compressive strength and residual strength increase linearly with the increase of confining pressure. By analyzing a lot of experimental data, getting a series of fitting curves and their relational expressions.