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介绍了3D-σ有限元法用于评价排水洞稳定性的基本方法,并结合深溪沟排水洞施工实例,对锚固支护方式等因素进行了有限元分析。工程实践表明,围岩应力状态是支护设计的依据,而适时支护是非常重要的,选择在围岩尚未丧失其抗载能力的时刻,及时进行衬砌支护,这对确保围岩稳定和支护安全具有重要意义。
The basic method of 3D-σ finite element method for evaluating the stability of drainage tunnels is introduced. Combined with the construction example of the drainage tunnel in Shenxigou, the finite element analysis of the factors such as anchorage and support methods is carried out. Engineering practice shows that the surrounding rock stress state is the basis of support design, and timely support is very important, the choice of the rock has not yet lost its load-bearing capacity of the moment, timely lining support, which is to ensure the stability of the surrounding rock and Support security is of great importance.