Thermal Properties of Mudstone at High Temperature

Abstract

An experimental study of the thermal damage properties of mudstone at high temperature can serve as a reference for problems in rock mechanics under high temperature, such as in oil exploration, geothermal resource development, and nuclear waste treatment. In this study, a uniaxial compression test of mudstone was conducted using the MTS 810 electrohydraulic servo system and MTS 652.02 high-temperature furnace under different temperatures ranging from 25 to 800°C to analyze the thermal damage properties of mudstone at high temperature. The main results of the study are as follows: the ductility of mudstone is improved under the effect of high temperature, and the failure mechanism exhibits a transition trend from brittleness to ductility; the elastic modulus increases from normal temperature to 400°C and then decreases rapidly when the temperature is over 400°C; and by defining the damage by tangent deformation modulus and combining the test data from uniaxial compression tests of mudstone at high temperature, the damage evolution rules of mudstone at high temperatures are obtained.