装配式地连墙力学性能分析及应用范围研究

Study on mechanical properties and application scope of trench cutting assembled diaphragm wall

渠式切割装配式地下连续墙较传统现浇地连墙施工对周边环境影响小,在基坑工程中的应用越来越多。基坑开挖过程中,必须控制围护结构的变形,以保护邻近地铁。为研究渠式切割装配式地下连续墙的力学性能和在邻近地铁深基坑工程中的应用,采用数值模拟手段建立了板桩-接头荷载结构模型,分析了板桩的力学性能;基于平面应变计算方法探讨了渠式切割装配式地下连续墙在邻近地铁深基坑工程中的适用性,提出其工程应用范围,结合工程实例验证了其合理性。结果表明,渠式切割装配式地下连续墙的力学性能与地连墙有相似性,当板桩变形小于30 mm时,其变形控制能力优于等厚度地连墙;数值分析结果与工程实测结果有较好的一致性,所提的工程应用范围较为合理。本文的研究成果对杭州软土地区邻近地铁设施的深基坑工程的设计和施工有一定指导意义。

Compared with the traditional diaphragm wall,the construction of the trench cutting assembled diaphragm wall has less impact on the surrounding environment.It is widely used in foundation pit engineering.During the excavation of foundation pit,the deformation of retaining structure must be controlled to protect the adjacent metro.In order to study the mechanical properties of the trench cutting assembled diaphragm wall and its application in the deep foundation pit engineering near the metro,the sheet pile joint load structure model was developed by means of numerical simulation,and the mechanical properties of sheet pile were analyzed.Based on the plane strain calculation method,the applicability of the trench cutting assembled diaphragm wall in the deep foundation pit engineering of adjacent metro was discussed.The scope of its engineering application was proposed,and its rationality was verified with an engineering example.The results show that the mechanical properties of the trench cutting assembled diaphragm wall are similar to those of the diaphragm wall.When the deformation of the sheet pile is less than 30 mm,its deformation control ability is stronger than that of the diaphragm wall with equal thickness.The numerical analysis results are in good agreement with the actual observed results.And the proposed engineering application scope is reasonable.The research results of this article have certain guiding significance for the design and construction of deep foundation pit engineering adjacent to metro in soft soil area in Hangzhou.