浅埋煤层开采覆岩裂隙发育规律的数值模拟

煤层开采引起的覆岩变形移动,造成顶板水突入井下,严重威胁煤矿生产安全。以榆阳矿区某矿一工作面为背景,基于离散单元数值模拟软件UDEC2D,模拟了浅埋煤层开采时上覆岩体中的位移、应力和裂隙的演化规律。研究表明:随着工作面的推进,采空区中部的裂隙部分被压实,裂隙主要富集于开切眼和工作面附近的上覆岩层中,并与裂隙带顶部的裂隙分布区构成了一个类梯形形状区域;工作面推进至140m时,裂隙发育到最大高度94.5m。研究成果为水下安全开采提供了依据。

A Numerical Simulation about the Low of Overburden Rock Fissures Development when Shallow Coal Seam being Mined

The overburden deformation and movement caused by mining may lead that water in the roof break into mine,which threat the production safety of coal mine seriously.Backgrounded in a coalface in Yuyang coal mine area,this paper study how the displacement, stress and fracture in the overlying strata develop by using non-continuous media discrete element program UDEC2D. According to the study ,when coal surface is moving,fissures in the center area of the gob will partially be compacted,while near the open cut and the face, aboundant of fissures lie in the overlying strata,which constitute a class of trapezoidal area with the top of the fissure fracture zone;when the work face is advancing to 140m,the height of fissure area reaches its maximum value,94.5 m.The results of this research provide a basis for underwater security.