浅埋煤层冲沟下开采坡体活动规律及其机理
首发时间:2008-12-30
摘要:煤层浅埋条件下,地表冲沟对岩层活动的影响使井下矿压显现异常。根据实验室相似材料模拟实验,得出了冲沟下开采时坡体活动规律;以冲沟坡体为研究对象,结合离散元数值计算结果,分析了坡体活动对井下开采的影响机理并建立了相应的力学模型,并提出了冲沟坡体活动对井下开采的影响具有一定的可控性。结果表明:向沟开采时,坡体出现水平滑移、整层回转;背沟开采时,坡体呈现多边块反坡倾倒;冲沟岸坡的临空性及井下采空是造成冲沟下开采时坡体岩层活动的主要原因。
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Laws and mechanisms of slope movement due to shallowly buried coal seam mining under ground gully
Abstract:Strata behavior associated with shallowly buried coal seam mining under ground gully is abnormal due to the effect of ground gully on slope movement. Based on the results of similar material simulation, the laws of slope movement due to mining under gully were analyzed. Focused on the slope rock, the mechanisms of slope movement influence upon underground mining were proposed and the respective structural models were built by means of the numerical simulation and physical simulation. It pointed out that the influence of slope movement on underground mining could be controlled to a certain extent by some appropriate measures. The results indicate that slope rock behaves horizontal sliding and rotation by layers in gully-wards mining which means mining towards gully, and reverse polygon rotation in gully-away mining which means mining away from gully. Slope movement associated with mining under gully is attributed to the free faces existing in underground and ground gully.
Keywords: shallowly buried coal seam gully-wards mining gully-away mining slope movement
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