某抽水蓄能电站地下厂房围岩劈裂破坏范围预测

对于处在高地应力脆性围岩中的地下洞室群,开挖时洞室围岩容易出现纵向的劈裂裂缝.采用滑移裂纹组模型模拟岩石在轴向压力作用下的劈裂破坏,以分析裂纹之间的相互作用.通过分别计算释放的弹性应变能,裂纹扩展耗散的能量,裂纹滑移耗散的能量,得到了高地应力下脆性岩体的劈裂破坏判据,并将该判据应用到某抽水蓄能电站的开挖计算分析过程中,为高地应力条件下地下工程开挖引起的劈裂破坏提供更加科学合理的预测判据.

Prediction on Surrounding Rock Splitting Failure of Underground Powerhouse in a Pumped-storage Power Station

For underground caverns with high geostress and brittle surrounding rockmass,the excavation will always lead to longitudinal splitting cracks in the surrounding rockmass.The interaction between cracks was analyzed by simulating the splitting failure under axial compression with multi-cracks sliding model.The splitting failure criterion was set up after calculating elastic strain energy and dissipation energies by cracks propagation and slip,and was applied to the underground powerhouse excavation analysis o...