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在无先例可循的条件下,背景工程采用三维岩土工程数值分析软件ZSOIL的流固耦合计算功能以及小应变硬化土模型,对基坑开挖、底板凿除、降承压水的全过程进行分析,预测基坑开挖及降承压水对周边环境的影响,并根据分析结果评价施工方案的可行性。实测结果表明,既有地下基坑结构改造过程中的降承压水引起周边项目最大沉降不超过7.6 mm,证明所采用的降水方案是可接受的。
In the absence of precedent, the background engineering uses the fluid-solid coupling calculation function of ZSOIL, as well as the model of small strain hardening soil, to analyze the whole process of excavation, floor excavation and lowering pressure water The impact of excavation and lowering pressure on the surrounding environment is predicted and the feasibility of the construction scheme is evaluated based on the analysis results. The measured results show that the maximum subsidence caused by the pressure drop during the reconstruction of the existing underground pit structure does not exceed 7.6 mm, which proves that the precipitation plan adopted is acceptable.