边坡J_(RC)-J_(CS)极限平衡安全系数的计算

Limit equilibrium calculation of safety factor for J_(RC)-J_(CS) slope

为了采用极限平衡法计算节理粗糙度系数JRC与节理压缩强度为JCS的岩质边坡安全系数,建立JRC-JCS准则下简化Bishop极限平衡计算公式,并分析JRC-JCS参数对于边坡安全系数的影响。研究结果表明:随着JRC的增大,黏结力c和内摩擦角-呈非线性增大,并且黏结力受影响的敏感度增大,而内摩擦角受影响的敏感度降低;黏结力c和内摩擦角-均随JCS的增大呈非线性增大;随着JRC和JCS的增大,边坡的安全系数F逐渐增大,JRC越大,节理面越粗糙,岩体的稳定性越高;JCS越大,岩石颗粒排列得越紧密,岩体的压缩强度越大,岩体的稳定性越高,边坡整体安全系数也越大;F与JRC和JCS的关系呈现非线性特征,可通过指数方程进行拟合。

In order to use limit equilibrium method to calculate the safety factor of the slope based on JRC--JCS model, the simplified Bishop limit equilibrium method for safety factor of the JRC--JCS slope calculation was established, and the influence of JRC--JCS parameters on slope safety factor was studied. The results show that cohesion c and internal friction angle φ increase with the nonlinear increase Of JRc. With the increase Of JRC, cohesion force sensitive influenced by JRC increases while that of the friction angle decreases. Cohesive force and internal friction angle increase nonlinearly with the increase of JCS. With the increase of JRC and JCS, the safety factor of the slope F increases gradually, the greater the JRC is, the rougher the rock mass joint surface, and the higher of the stability of the rock mass becomes. The higher JCS is, the more closely to the rock particles aligned, and the greater the rock compression strength is, so the increasing stability of the rock slope leads to greater overall safety factor. The relations ofF with JRC and JCS show nonlinear characteristics, and can be fitted by exponential equation.