接触单元法在层状顶板离层变形分析中的应用

Application of the contact element method in analyzing the separation and deformation of the stratified roof

为了正确处理岩层交界面的接触问题,准确掌握巷道顶板离层变形状况,根据非线性接触理论,提出采用接触单元法模拟层间接触面,在此基础上构建了分析层状顶板结构的数值计算模型.以山西亚美大宁煤矿全煤巷道为例,运用ANSYS有限元软件模拟分析了巷道开挖后的顶板离层变形特征.数值结果显示,顶板的离层范围为2.6 m,其中顶板1.8 m范围内顶板离层较为明显.FS-4200M钻孔窥视仪现场窥视表明,计算结果与现场实际基本吻合.

In order to properly reflect the mechanical characteristics of the interface and give a correct simulation of the roof separation, a contact element method based on the nonlinear contact theory was put forward, and a finite-element numerical model of the laminated roof in the roadway was built. A gateway entry of Shanxi Asian American Daning Coal Mine was taken as a primary model to be simulated. The characters of the roof deformation as well as the separation were recurred with the ANSYS software after the entry were excavated. The result of simulation shows that the separation scope of the gateway roof is about 2. 6 m and remarkable scope is 1.8 m. Aided by the FS - 4200M strata-scope, the state of the in-situ roof separation was obtained. The calculated results are coincident with the actual observation.