充填体对地表沉降控制的研究

Control of Ground Subsidence by Backfilling

基于某煤矿使用煤矸石胶结充填开采的工程实例,对充填工作面的上覆围岩的移动变形进行了模拟研究。运用MidasGTS建立了三维模型,采用有限元分析方法研究了充填采场的稳定性状态。研究结果表明:充填后的工作面上覆围岩的位移为0.0314398 m,远小于采空区顶板的位移0.101611 m;充填后的顶板基本不产生拉应力,而空区的最大拉应力达3.47156 MPa。由此可知充填体的加入,有效的控制了工作面上覆岩层的位移,使煤层上方650 m的地表不发生沉降;对地应力的控制效果非常明显,使地应力重新恢复到稳定状态。

Based on the practice of cut-and-fill mining in a coal mine with coal gangue used for cemented backfilling, a simulation study was conducted on the movement and deformation of the overburden on backfilling working face. Based on a three-dimensional model established with Midas GTS, stability of backfilling stope was analyzed with finite element method. Results showed that the displacement of the overburden on the working face after filling is 0. 0314398 m, far less than the displacement（0. 101611 m） of the roof in mined-out area. There＇s little tensile stress generated on the roof after backfilling, but a maximum tensile stress of 3. 47156 MPa in mined-out area. It was concluded that the backfill can effectively control the displacement of overburden on the working face, avoiding the ground settlement occurred on the place 650 m above the coal seam. It can also effectively control ground stress to be stable again.