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地下厂房稳定分析首先要确定围岩变形破坏运动类型。本文按照四种岩石力学条件从工程实践中归纳了五种变形破坏运动类型,以便在设计阶段进行初步判断和选择岩体力学模型,并以三峡工程地下厂房为实例,着重研究了块体结构的围岩稳定分析方法。在建立围岩力学模型时,要结合地下洞室的尺寸处理不同规模的不连续面。三个方向的应力对块体稳定性的响影同样重要,在没有条件使用三维有限单元法时,可用全空间赤平投影法与二维有限单元法结合计算。研究结果表明,在设计地下洞室方向时,不仅要考虑初始应力的方位,同时还应考虑软弱结构面的方向。
The stability analysis of underground powerhouses must first determine the type of rock deformation and failure. In this paper, five kinds of deformation and failure movement types are summarized from the engineering practice according to the four rock mechanics conditions, so as to make preliminary judgment and select the rock mechanics model at the design stage. Taking the underground powerhouse of the Three Gorges Project as an example, the emphasis is on the research of the block structure. Surrounding rock stability analysis method. When building a rock mechanics model, it is necessary to deal with discontinuous surfaces of different sizes in combination with the size of the underground cavern. The effect of stress in three directions on the stability of the block is also important. When there is no condition for using the three-dimensional finite element method, the full-space stereoplanar projection method can be used in combination with the two-dimensional finite element method. The research results show that when designing the direction of the underground cavern, not only the orientation of the initial stress should be considered, but also the direction of the weak structural plane should be considered.