锚喷支护洞室的弹塑性边界元——有限元耦合计算法

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。

ELASTOPLASTIC ANALYSIS OF UNDERGROUND OPENING OF SHOTCRETE-SUPPORTING BY COUPLING METHOD OF B. E. AND F.E.

In this paper calculating principles of elastoplastic analysis of underground opening supporteel by shotcrete under initial field stress by coupling method of B.E. and F.E. are presented, and the calculating formulae are derived. The programme of a computer is compiled according to the principles and formulae as mentioned in this paper. The stability of underground opening has been analyzed in the computing example. The shoterete is imitated by F.E. and the rock domain in which non-zero inelastic slrains are expected to develop is handled by B.E. The general integral equation systems are establisheel by making use of continuity conditions of the interface between shotcrete and rock mass. For an perfectly elastoplasie ease the displacements and slresses in rock mass and shotcrete are obtained by iterative computation.