跑马坪矿2350以上矿体开采对地表拦渣坝的影响

为了确保地表拦渣坝的稳定,采用离散元程序2D-BLOCK模拟地下矿体开采对地表拦渣坝的影响,计算了矿体开采过程中上覆岩层的冒落过程。通过模拟结果表明：岩层移动是一个自下而上传递的动态过程,只开采左1采场矿体不会影响到地表拦渣坝的安全；而将右2采场回采矿体后,上盘围岩发生大面积冒落,垮落至离地表40m左右时才不再冒落,但上部没有冒落的岩层仍有裂缝存在,说明将右2采场完全采空后极有可能会影响到上部拦渣坝的安全稳定,因此建议处在拦渣坝正下方的右2采场,回采过程中必须保留保安矿柱,这样地表拦渣坝的安全才能有保障。

Influence of the orebody mining above 2350m on stability of ground blocking dregs dam in Paomaping Mine

To ensure the safe of blocking dregs dam, influence of underground mining on blocking dregs dam of surface was simulated by 2D-BLOCK. Caving process of overlying strata in process of deposit body exploitation was calculated. Simulation results show that strata movement is a dynamic process of transfer from bottom to top, and the safety of surface dam is not affected by mining of left 1 stope orebody ; however, when the orebody is mined at the right 2 stope, large area caving happens in the surrounding rock of the hanging wall and falls to about 40m of the ground surface before falling off again. So caving mineSgoaf is very close to the surface, which show that mining of the right 2 stope will probably affect the stability of the upper dam. Therefore, it is suggested that the safety pillar should be retained during the stoping at the right 2 stope orebody under the dam.