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初始应力场的形成与围岩性质、构造、埋藏的条件和构造运动的历史有着密切的联系,是指隧道结构开挖前的围岩周围的初始静态应力场,它问题是相当复杂的。初始地应力状态与施工引发的附加应力状态是不相同的,对遂道开挖后围岩的应力分布、破坏、变形有着相当重要影响,可以这么说:对坑道开挖后一系列力学过程和现象做出正确评价是需要我们对围岩初始应力状态有充分了解的。
The formation of initial stress field is closely related to the nature of the surrounding rock, tectonic and burial conditions and the history of tectonic movement. It refers to the initial static stress field around the surrounding rock before excavation of the tunnel structure. The problem is quite complicated. The initial state of stress is not the same as the state of additional stress caused by construction. It has a quite important influence on the stress distribution, destruction and deformation of surrounding rock after tunnel excavation. It can be said that after a series of mechanical processes and Phenomenon to make a correct assessment is that we need to fully understand the initial state of surrounding rock stress.