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青岛地铁车站均为土、岩组合地层,车站大部分在风化程度不同的岩层中,因此研究土岩组合地层中暗挖法车站的合理埋深及结构参数有一定意义。以青岛地铁五四广场站为例,采用数值模拟方法,利用有限元软件Abaqus,结合强度折减法和结构安全系数方法,探讨暗挖车站稳定性的影响因素。通过对车站埋深、衬砌强度及应力释放率正交设计优化模拟,得出埋深影响车站围岩结构的稳定性最大,其次是衬砌强度和应力释放率。通过分析,对结构及施工参数进行了优化,优化方案的车站围岩安全系数为1.69,结构安全系数有足够的余度。
Qingdao subway stations are soil and rock combination stratum, most stations are in different degrees of rock formation, so it is of certain significance to study the reasonable depth and structure parameters of undercutting stations in earth-rock composite strata. Taking the Wusi Square station of Qingdao Metro as an example, numerical simulation method was used to study the influencing factors of the stability of the excavation station by using the finite element software Abaqus, combining the method of strength reduction and structural safety factor. Through orthogonal design optimization simulation of the station depth, lining strength and stress release rate, it is concluded that the depth stability has the greatest stability of the surrounding rock mass of the station, followed by the lining strength and stress release rate. Through the analysis, the structure and construction parameters are optimized. The safety factor of the surrounding rock mass of the optimized scheme is 1.69, and the structural safety factor has sufficient redundancy.