岩层走向对地下洞室围岩稳定的影响

Influence of bedding strike direction on stability of underground caverns

层状岩体沿层面方向和垂直于层面方向的物理力学特性各异,表现出明显的各向异性,其破坏形式也与一般各向同性岩体不同.根据层状岩体的物理力学性质分析了其破坏特性及其迭代计算方法.采用三维非线性弹塑性有限元数值计算方法,从变形、破坏、应力和扰动综合分析了层状岩体中岩层走向对洞室围岩稳定的影响.通过对一工程实例中各种洞室厂房轴线的计算和比较,结合工程经验,得出层状岩体中地下洞室的合理轴线布置方式.分析结果与工程实际相吻合,为工程设计提供了比较可靠的理论依据.

The physico-mechanical characteristics of layered rock are different between its tangential and normal orientations. And so it possesses anisotropic characteristics and its failure mode is out of the ordinary. The failure characteristics and the calculation method of layered rock are expounded according to its physico-mechanical characteristics. Then influence of strike direction of layered rock on stability of underground caverns is analyzed by using 3D nonlinear elastoplastic finite element method according to states of deformation, failure, stress and disturbance. According to computation and comparison for an engineering example with many programs and engineering experiences, the reasonable layout of underground caverns in layered rock are put forward. The results are in accordance with engineering experiences so as to provide a reliable theoretical basis for engineering design.