【摘要】 采用YTJ20型岩层探测记录仪,对新汶孙村煤矿埋深1300m、侧临采空的2222东回风巷内顶板破裂分区进行探测研究,结果表明:深部高应力是深部岩层分区破坏的根源;在侧空开采条件下,处于深部高支承压力集中的区域,顶板岩层内分区破裂数量将大于处于卸荷、大变形区域岩层分区破裂数量,但受岩层沉降大变形的影响,沿着卸荷、大变形区域岩层内原宽裂缝或离层的下部,在张裂作用下破裂区将进一步扩展,因此可以通过观测离层来确定深部较大尺度岩层分区破裂的位置;同时,岩性对分区破裂有一定的影响,粉砂岩比砂岩更易出现分区破裂现象。研究结果为进一步研究深部关键层结构及其力学特征,深部岩层分区破裂和深部岩石力学致灾机制之间的关系提供依据。更多还原

【Abstract】 Strata exploring instrument of YTJ20 was adopted for inspecting the zonal fractures inside roof strata with lateral cave,in eastern ventilation roadway No.2222 of 1 300 m deep in Suncun mine.The results show that high level stress is the root of zonal disintegration in deep mines.Under the lateral cave condition,the quantity of fractured zones inside the high stress strata is more than that inside the meiobar of strata being in the state of unloading and large subsidence.But tensile fractures expand underneath the wide split or separation in the unloading and large subsiding strata,so the location of large-scale zonal disintegration can be determined by measuring the bedding separation.Also,the mechanical properties of strata have a great influence on the zonal disintegration;zonal disintegration is easier to occur in siltstone than in sandstone.The results supply a basis for researching the structure and mechanical features of deep key strata;and establishing the relations between zonal disintegration and rationale of rock mechanical disaster in deep mine further is also presented.更多还原