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本文阐述了具有喷层支护的地下洞室在围岩压力作用下弹塑性边界元和有限元耦合法的计算原理,导出了计算公式,并编制了相应的计算机程序,对具有喷层支护的地下洞室进行了稳定性分析,将喷层考虑为有限元区域,用边界元法对围岩进行塑性分析,通过围岩与喷层接触面上的谐调条件建立了统一的积分方程组,利用“近似中点刚度法”对理想弹塑性岩体进行了增量迭代计算,从而求出围岩和喷层中的应力和位移。
This paper expounds the calculation principle of elasto-plastic boundary element and finite element coupling method for underground caverns with spray layer support under surrounding rock pressure, derives the calculation formula, and compiles the corresponding computer program, which has spray layer support. The stability of the underground cavern was analyzed, the spray layer was considered as a finite element region, and the boundary rock was used to conduct plastic analysis of the surrounding rock. A uniform integral equation system was established by the harmonized conditions on the interface between the surrounding rock and the sprayed layer. Using the “approximate neutral point stiffness method”, an incremental iterative calculation of the ideal elasto-plastic rock mass was performed to obtain the stress and displacement in the surrounding rock and spray layer.