A Study on the Mechanical Behavior and Statistical Damage Constitutive Model of Mudstone under Low Confining Pressure

Firstly, Triaxial compression test of mudstones under low confining pressure is conducted to study deformation behaviors and mechanical properties. Then, assumed that the strength of micro-elements fits power function distribution, this paper determines a damage variable and establishes a damage constitutive model which effectively reflects the residual strength in the process of rock failure. Meanwhile, using testing data is to validate the reliability of the proposed model in this paper. Finally, impacts caused by statistic parameters variation on compression strength are analyzed comprehensively. These research outcomes presented in this paper also can effectively offer significant reference for the development of rock mechanics and rock engineering.