近浅埋煤层重复采动覆岩裂隙发育相似模拟

Similar Simulation of Overlying Strata Fracture Development under Repeated Mining in Shallow

为了得到近距离浅埋煤层重复采动对覆岩裂隙发育的影响,以神东集团石圪台矿为工程背景,利用相似理论进行相似模拟实验,通过对比单层煤开采与重复采动在矿压显现和移动破坏等方面的变化对覆岩裂隙发育进行分析,得出了近距离煤层重复采动对覆岩位移、矿压及裂隙演化的特征影响。结果表明:相比于单一煤层开采,重复采动覆岩裂隙明显增多,来压步距有所减短;覆岩达到最大下沉量位置更靠近开切眼一侧,为工程实践提供了一定理论基础。

In order to study the influence that repeated mining of contiguous seams in shallow to overlying strata fracture development,it taking Shigetai coal mine of Shendong group as engineering background,similar simulation experiment that based on similar theory was utilized,the influence that some variations of strata behavior and convergence failure of single coal seam mining and repeated mining to overlying strata fracture development were analyzed,the characters influence that repeated mining in contiguous seams to overlying strata movement,strata behavior and fracture development The results showed that fractures developed quickly under repeated mining as single coal seam mining,and pressure distance decreased obviously,the maximum subsidence of overlying strata was close to the side of open off cut,it references for engineering practical