为探讨岩石的强度理论和中间主应力效应，进行了红砂岩真三轴压力试验。
The true triaxial pressure experiment for red sand rock is conducted for the purpose of investigation into the strength theory of rock and the effect of intermediate main stress.
通过动力三轴试验，给出了饱和砂的残余孔隙水压力的全量表达式和不同液化破坏阶段的临界孔隙水压力比的表达式。
Expressions of total residual pore pressure and critical ratio of pore pressure in different failure stages of liquefaction in saturated sand are deduced based on the dynamic tri-axial tests.
方法采用常规三轴岩石强度试验装置，进行井下温度压力条件下的泥浆侵入过程模拟试验。
Method Mud invasion process is simulated with conventional three axis rock strength test device under same downhole pressure and temperature.
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