超深基坑支护开挖对土体变形影响数值模拟研究

Numerical Simulation Study on the Influence of Extremely Deep Pit Bracing and Excavation on Soil Deformation

研究目的:为了掌握基坑开挖引起的围护结构变形和地层沉降的计算模拟方法,利用理论分析、数值模拟,以土与支护结构相互作用稳定性为研究核心,对深基坑开挖过程中引起的土层位移、地表沉降分布规律以及支护结构的位移、应力改变等相关内容进行研究,掌握基坑开挖引起的围护结构变形和地层沉降的计算模拟方法,从而指导设计工作。研究结果:基坑开挖至设计深度并完成底板施工时,模拟计算基坑外缘地表最大沉降为28.7 mm,施工过程中实测结果为28.46 mm,模拟分析计算结果与实际工程监测结果大致吻合,故研究结果可以指导设计工作。

Research purposes： The studies are done on the soil displacement, distribution of soil surface settlement, timbering structure displacement and stress variety caused by bracing and excavation of extremely deep pit with theoretical analysis and numerical simulation methods for the purpose of mastering the simulation method of timbering structure deformation and soil settlement caused by pit excavation to direct the design work. Research results： The study results indicate that based on the computation, the maximum surface settlement is 28.7 mm when the excavation was finished and the bottom floor was constructed. The measured surface settlement is 28.46 mm during the construction, which is closed to that by computation, so the result of the research can be used for directing the design.