【摘要】：針對晉城礦區(qū)開展下保護(hù)層開采試驗,采用模擬試驗,現(xiàn)場實測等手段研究下保護(hù)層開采覆巖運移、裂隙動態(tài)演化特征及被保護(hù)層變形規(guī)律。模擬結(jié)果表明:伴隨基本頂?shù)闹芷谄茢?采動裂隙呈梯形演化,貫通的豎向裂隙沒有連通至上被保護(hù)層。保護(hù)層開采后,被保護(hù)層下沉平緩連續(xù),膨脹變形率保持在0.5%左右。深基點位移計動態(tài)監(jiān)測下保護(hù)層94302工作面開采覆巖運動全過程,得到了監(jiān)測巖層的移動曲線,掌握了上覆巖層橫向三區(qū)、縱向三帶離層裂隙時空演化規(guī)律。通過鉆孔電視觀測覆巖裂隙分布特征及被保護(hù)層煤體結(jié)構(gòu)變化,得到冒落帶高度2.2~4.5 m,裂隙帶高度20.0~25.7 m,發(fā)現(xiàn)被保護(hù)層煤體受采動影響產(chǎn)生水平方向為主的小角度次生裂隙。
[Abstract]:In view of the mining test of the lower protective layer in Jincheng mining area, the migration of overlying rock, the dynamic evolution characteristics of fissures and the deformation law of the protected layer in the mining area of Jincheng mining area are studied by means of simulation test and field measurement. The simulation results show that with the periodic fracture of the basic top, the mining fracture evolves ladder, and the vertical fracture through is not connected to the protected layer. After the mining of the protective layer, the subsidence of the protected layer is gentle and continuous, and the expansion deformation rate is kept at about 0.5%. Under the dynamic monitoring of deep base point displacement meter, the whole process of overlying rock movement in protective layer 94302 working face is obtained, and the movement curve of monitoring strata is obtained, and the temporal and spatial evolution law of cracks in transverse three zones and longitudinal three zones of overlying strata is mastered. The distribution characteristics of cracks in overlying rocks and the structural changes of coal bodies in protected strata are observed by drilling TV. The height of caving zone is 2.2 鈮，

本文編號：2493734