综放开采工作面覆岩EH-4电导率分布特征
Distribution Characteristics of Overburden EH-4 Electric Conductivity in Full Mechanizd Caving Face
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摘要: 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800 Ω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30 Ω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10～20 Ω之间,呈充水特征。
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关键词:
- 特厚煤层 /
- 综放开采 /
- 覆岩破坏 /
- EH-4电导率成像系统 /
- 岩层充水
Abstract: To understand the situation of overburden damage and water filling after mining to ensure safety mining under reservoir,EH-4 electric conductivity imaging system was used to forecast overburn damage in N1S1 coal face of Daping coal mine.It can be obtained from the image data of rock strata conductivity that overlying strata above goal forms a arched high resistance zone with high resistance when advancing length of working face is 22 m,the height of the arched zone is about 90 m which is as 7.2 times as mining height when strata conductivity is more than 800 Ω.When advancing length of working face is 92 m,the height of the arched low resistance zone is about 300 m which is as 24.2 times as mining height and strata conductivity decreases to less than 30 Ω.When the angle range of working face advancing is about 70°,strata is destroyed and water filled and conductivity decreases.When working face length advances 160~190 m,strata conductivity is normally between 10 Ωto 20 Ω,and strata shows water filling characteristics. -
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