采动影响下硐室群稳定性预测研究

Forecast of Stability of Underground Caverns Affected Rock Mass by Mining

在受采动影响情况下,为了判断岩体内硐室群的稳定性,提出了利用概率积分法与Druck-er-Prager准则相结合的判断方法.在极坐标系统下,根据概率积分法原理,推导出岩体内任意一点的xε,εy,zε,γxy,γxz,yγz等6个变形分量;以此为基础,求出该点的最大主应变、中间应变、最小主应变,利用Drucker-Prager准则,求出应力差Δf;若Δf大于零表明该点己破坏,若小于零表明该点不受采动影响.利用自主开发的判别程序,生成离散数据,借助Grapher4.0后处理平台,生成可视化图形,进而直观地判断岩体内硐室群的应变状态是否达到破坏.工业性试验表明该方法判断岩体内硐室群受开采影响情况下具有一定的可靠性.

We propose the method of using the probability integral in combination with the D-P(Drucker-Prager) criterion to determine the stability of underground caverns affected by mining.According to the basic theory of probability integral in a polar coordinate system,the deformation components of εx,εy,εz,γxy,γxz and γyz at a random point in rock mass are deduced.On this basis,the maximum principal strain,the middle strain,and the minimum principal strain are deduced and the stress difference Δf is obtained by using the D-P criterion.If Δf is greater than zero,it indicates that this point has become failure;if Δf is smaller than zero,it indicates that this point has not become failure.The discrete data is generated by using the self-developed computer program and the visual graph is generated with the aid of Grapher 4.0.By doing so,we can visually judge whether the deformation of the underground caverns has reached a failure state or not.The practice shows that this method is some reliabile.