开挖卸荷后节理岩质边坡的稳定性分析

Analysis of Stability of Jointed Rock Slope Unloading

在对节理裂隙受拉压不同状态的分析基础上,分别采用应力控制裂隙张开、应变控制裂隙闭合的判别准则,利用ABAQUS软件建立了倾角为90°的垂直节理和倾角为52.5°的倾斜节理组成的节理岩质边坡模型,并对该节理岩质边坡的稳定性进行了模拟分析。通过对节理岩质边坡破裂过程的模拟,直观地得到了坡体的滑移破坏面,证明了节理是控制岩质边坡破坏的主要因素,对于理解边坡的破坏形成机理具有重要意义,说明该判别准则能够较为准确地预测节理岩质边坡潜在破坏面的形状与位置,对于复杂的边坡稳定性分析可以提供相应的理论借鉴。

Based on the analysis foundation of the jointing tension or presses the different condition, used the stress adjustment joint to open, the strain control joint closed criterion separately, had established the double jointing rock slope model which used the ABAQUS software. The rock mass contains two sets of planes of weakness ： one vertical set of joints and one set of inclined joints. And the simulation analysis to this jointing rock s slope＇s stability has been carried on. Through this method to the jointing rock slope slide proeess＇s simulation, the slope body＇s slipping failure plane was ob- tained intuitively. It proved that the jointing controls the primary factor which the rock slope destroys. It is the important meaning to mderstand slope Is destruction which forms mechanism. This criterion can forecast accurately the jointing rock slope latent failure plane＇s shape and position, may provide the corresponding theoritical regarding the complex rock slope stability analyses.