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为了解采动覆岩破坏充水情况,确保水库下压煤安全开采,大平煤矿利用EH-4电导率成像系统在N1S1工作面对采动覆岩进行了探测。经对岩层电导率图象解译:工作面推过22 m,采空区上方岩层内形成一拱型高阻区,电导率800Ω以上岩拱高度约90 m(相当于采高的7.2倍);工作面推过92 m,采空区上方高度约300 m(相当于采高的24.2倍)为拱形低阻区,岩层电导率30Ω以下,离层破碎岩层集中发育在拱顶部区域。工作面超前约70°角范围,岩层破坏充水,电导率下降。推过160～190 m后,上覆岩层电导率普遍在10～20Ω之间,呈充水特征。
In order to understand the situation of mining overburden rock destruction and water filling, and ensure safe mining of coal under pressure, Daping Coal Mine carried out exploration on the N1S1 working face by using EH-4 conductivity imaging system. After interpreting the conductivity of the rock formation, the working face is pushed over 22 m and an arched high-resistance zone is formed in the rock formation above the gob area. The rock arch height above 800 Ω is about 90 m (equivalent to 7.2 times of mining height) ; The working face is pushed through 92 m, the height above the goaf is about 300 m (equivalent to 24.2 times of mining height), which is the arched low resistance zone with the conductivity of 30Ω or less. The broken rock strata are concentrated in the vault area. Face ahead of about 70 ° angle range, water damage rock formation, conductivity decreased. After 160 ~ 190 m of pushing, the conductivity of the overlying strata generally ranges from 10 to 20Ω, and is characterized by water-filling.