特殊地层中一种双层井壁结构的应力计算

Stress calculation for a double layer shaft in special strata

针对特殊地层中的一种双层井壁结构,建立了其受力分析方法。利用附加力分布规律对力学模型进行了简化,应用线性叠加原理将问题分解为自重特解、侧面边界特解、均布端部力解答3个子问题,分别求解各子问题并叠加后便得到简化力学模型的一组圣维南解。以某双层井筒为背景进行了算例分析,并与相同条件下单层井壁的应力计算结果进行了对比。利用第四强度理论分析了井壁的安全性,结果表明,与单层井壁相比,该双层井壁内壁安全性得到了较大的提高,而外壁安全性则有所降低。总体而言,采用该双层井壁结构对矿井的安全生产是有利的,而外壁是该井壁结构需要加强治理的薄弱环节。

A stress calculation method has been established for a double layer shaft in special stratum. After some simplifications of the mechanical model,the problem has been broken down into three subproblems, and a Saint-Venant solution has been obtained by solving and adding up each subproblem. An example for certain double layer shaft has been presented, and the stress results have been compared with the single layer shaft of the same conditions. The fourth strength theory has been applied to study the security of the shafts, and the results show that, compared with the single layer shaft, the security for the inside lining of the double layer shaft is enhanced greatly, while the security of the outside lining is reduced. On the whole, the application of this double layer shaft is advantageous for the safety production of the mine,and the outside lining of this shaft is the weak zone that needs to be cured mainly.