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土岩结合条件下深基坑支护问题是大连地区面临的典型支护问题。桩锚支护结构作为典型基坑支护形式,使其在坑内预留平台的二元结构深基坑中如何有效发挥作用、既经济又安全,是近年来人们不断探索的课题。本文结合本地区一实际工程,运用有限元软件ABAQUS基坑开挖全过程进行非线性分析,结果表明:二元结构分界处是引起支护结构“急剧”变形的关键位置。通过与监测数据对比,表明该数值模型的可靠性,得到了相关的基坑变形规律,为类似土岩结合地区深基坑支护设计、施工及监测提供借鉴。
The support of deep foundation pit under the condition of soil-rock joint is a typical support problem in Dalian area. As a typical form of foundation pit support, the pile-anchor supporting structure can effectively play its role in the deep foundation pit with dual structure reserved in the pit. It is not only economical but also safe, which is a subject that people continue to explore in recent years. Based on an actual project in this area, the nonlinear analysis of the entire process of excavation with finite element software ABAQUS is carried out. The results show that the boundary of binary structure is the key position of “sudden” deformation of supporting structure. By comparing with the monitoring data, the reliability of the numerical model is proved, and the related deformation laws of the foundation pit are obtained, which can provide reference for the design, construction and monitoring of the deep foundation pit support in the similar soil-rock combined area.