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分析了高地应力条件下地下厂房高边墙变形突变的形成机制,认为地应力动态卸荷引发的围岩松动是导致地下厂房高边墙变形突变的重要原因之一。基于瀑布沟地下厂房高边墙变形突变的实测资料,利用理论分析和数值模拟,计算了高地应力准静态和动态条件下地下厂房开挖卸荷引起的厂房高边墙的水平向位移。与实测资料对比表明,在动态卸荷过程中,结构面的张开和滑移是引起地下厂房围岩变形突变的主要原因,而在准静态卸载条件下,这种结构面张开变形却并不明显。在实际工程中应考虑开挖引起的地应力动态卸荷效应,尽量减小每次开挖对围岩扰动,谨防引起变形突变甚至失稳破坏。
The formation mechanism of deformation and deformation in the high-side wall of underground powerhouse under high ground stress is analyzed. It is considered that the looseness of surrounding rock caused by the dynamic unloading of ground stress is one of the important reasons leading to the deformation and deformation of the high-side wall of underground powerhouse. Based on the measured data of the deformation of the high side wall in Pubugou underground powerhouse, the horizontal displacement of the high side wall of the factory building caused by the unloading of underground powerhouse under high static stress and dynamic conditions was calculated by theoretical analysis and numerical simulation. Compared with the measured data, it is found that in the process of dynamic unloading, the open and slipping of the structural plane is the main reason causing the sudden deformation of the surrounding rock of the underground powerhouse. Under quasi-static unloading conditions, Not obvious. In the actual project, the dynamic unloading effect of earth stress caused by excavation should be considered to minimize the disturbance of surrounding rock during each excavation, so as to avoid sudden deformation or even destabilization.