高家堡煤矿高水平应力作用下巷道围岩变形研究

Research of deformation of roadway surrounding rock under effect of high horizontal stress in Gaojiapu Coal Mine

  • 摘要: 为研究高家堡煤矿高水平应力作用下巷道围岩变形特征,对高家堡煤矿进行了地应力测量,结果表明,高家堡煤矿以水平应力为主,最大水平主应力为38.67 MPa,方位角为227.30°。对巷道轴向与最大水平主应力方向夹角不同的2条回风巷围岩变形进行了数值模拟和现场实测,结果表明:当巷道轴向与最大水平主应力方向夹角为12°时,塑性区分布在巷道周边附近,呈椭圆状;当巷道轴向与最大水平主应力方向夹角为78°时,顶板塑性区向巷道两角斜上方发展,出现类似方形的塑性区;巷道顶底板的破坏程度大于两帮;巷道轴向与最大水平主应力方向夹角越大,围岩变形越大。

     

    Abstract: In order to study deformation characteristics of roadway surrounding rock under effect of high horizontal stress in Gaojiapu Coal Mine, geostress of Gaojiapu Coal Mine was measured. The results indicate that Gaojiapu Coal Mine is dominated by horizontal stress. The maximum horizontal principal stress is 38.67 MPa and azimuth angle is 227.30°. Numerical simulation and field test of surrounding rock deformation of two return airways with different angles between roadway axis and the maximum horizontal principal stress direction were conducted. The results show that distribution of plastic zone is near the roadway surrounding and shows oval shaped when angle between the roadway axis and the maximum horizontal principal stress direction is 12°. Plastic zone of roof develops on top corners of the roadway and is similar to square when angle between the roadway axis and the maximum horizontal principal stress direction is 78°. The damage degree of roadway roof and floor is higher than that of two sides, and the larger the angle between the roadway axis and the maximum horizontal principal stress direction, the greater the deformation of surrounding rock.

     

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