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以某紧邻区间隧道深基坑为研究对象,建立三维有限元模型对基坑施工过程进行模拟,然后根据分析结果对基坑支护结构进行优化。结果表明,优化后的方案基坑开挖引起的区间隧道最大位移较原方案减小了36.3%,隧道结构最大裂缝满足规范要求,即优化后的方案能够更好地保护隧道结构的安全。研究结果可为今后紧邻隧道的基坑支护设计提供一定借鉴。
Taking the deep foundation pit of an adjacent tunnel as the research object, a three-dimensional finite element model is established to simulate the construction process of the foundation pit, and then the foundation pit supporting structure is optimized according to the analysis results. The results show that the maximum displacement of the tunnel caused by excavation of the optimal scheme is reduced by 36.3% compared with the original scheme, and the maximum cracks in the tunnel structure meet the requirements of the specification. That is, the optimized scheme can better protect the safety of the tunnel structure. The results of the study can provide some reference for the design of the foundation pit supporting tunnel in the future.