恒源煤矿井筒非采动破坏判据的弹性力学分析

    Elastic Mechanics Analysis of Non-mining Failure Criteria for Shaft Lining in Hengyuan Coal Mine

    • 摘要: 以恒源煤矿为例,根据煤矿新生界含隔水层的多层沉积特征及弹性力学理论,给出各含、隔水层的位移函数,运用变分法得出松散层底含释水时,各层下沉时作用在井筒上的摩阻力解析解。在此基础上,利用摩尔-库伦强度理论对立井井筒进行强度校核,得出立井井筒的非采动破坏的临界水头降深值。研究结果表明,恒源煤矿井筒发生非采动破坏时的极限附加荷载为0.68 MPa,即临界水头降为68 m,计算结果与矿井实际情况较为吻合。

       

      Abstract: Taking Hengyuan Coal Mine as an example, according to the sedimentary characteristics of Cenozoic water-bearing and water-resisting layer and the theory of elastic mechanics, we give the displacement function of each aquifer and water-resisting layer. The analytical solution of frictional resistance acting on shaft lining during the sinking of each layer is got by using the variational method when the floor of unconsolidated layers contains or releases water. On this basis, the Mohr-Coulomb shear failure theory is used to analyze the strength of shaft lining. The critical waterhead fall of non-mining fracturing of shaft lining is got. The ultimate additional load is 0.68 MPa when the shaft lining of Hengyuan Coal Mine occurrs non-lining fracturing and the drop of head is 68 m. The calculation results obtained from formula agree well with the actual condition of mines.

       

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