岩石间接拉伸试验的数值模拟

用岩石破坏过程分析数值软件(FRPA),对三点弯曲、圆环劈裂和圆环水压致裂3种间接拉伸试验进行数值模拟,通过不同试验条件下得到的试验结果,对各试验方法相对应的抗拉强度求解公式的使用条件给出建议.结果表明:求解抗拉强度的每个计算公式都有其相对应的应用条件,有明显的尺寸效应;影响三点弯曲法求解抗拉强度的因素较多,但计算公式本身并未完全体现出来;圆环水压致裂法影响因素少,适用性强,准确性高.

Numerical Simulation of Indirect Tensile Tests for Rock

The RFPA(Rock Failure Process Analysis) code was used to make the numerical simulation of indirect tensile tests of three points bend,cirque crack and cirque hydraulic pressure crack.Suggestion was made on the application conditions of the tensile strength formula for each test method based on the obtained test results under different test conditions.The test results show that each formula for tensile strength has its own corresponding application conditions and has evident dimensional effect.The factors influencing the solution of the tensile strength in three-point bend method are many and are not all embodied in the calculation formula while the cirque hydraulic pressure crack method has few influencing factors,strong applicability and high accuracy.