基坑双排桩支护的桩间土等效计算模型研究  

Study on Equivalent Calculation Model of Soil Between Piles in Double-row Piles Supported by Foundation Pit

作　　者：曹净[1] 钱国伟[1] 高越 左怀西 Cao Jing;Qian Guowei;Gao Yue;Zuo Huaixi(Faculity of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,P.R.China;CABR Foundation Yunnan Co.,Ltd.,Kunming 650016,P.R.China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]建研地基云南有限公司,昆明650016

出　　处：《地下空间与工程学报》2020年第3期749-757,共9页Chinese Journal of Underground Space and Engineering

摘　　要：随着基坑向场地复杂和变形控制严格的趋势发展,因各种应用较少的基坑双排桩支护又重新受到了重视,工程应用逐渐增多,但现有基坑双排桩计算模型中桩间土等效问题仍有待完善。在现行的行业规程计算模型的基础上,从3个不同的角度对桩间土等效模型做出尝试与探讨,提出了3个基坑双排桩改进计算模型。而在对3个改进计算模型进行总结后,通过引入了等效桁架模型,进一步对桩间土等效模型进行改进,并提出基于等效桁架模型的基坑双排桩结构计算模型。结合具体的算例,对4个改进计算模型的合理性加以验证,通过4个计算模型之间的对比分析,得出基于等效桁架模型的基坑双排桩结构计算模型更加合理。最后,将基于等效桁架模型的改进计算模型应用到昆明地区一个实际工程案例中,通过工况和桩间土压缩特性的分析,对双排桩支护结构的受力和变形特性进行了探讨,旨在能为基坑双排桩支护的理论研究及工程应用提供一定的参考。The double-row piles support seldom applied in foundation pit due tovarious reasons has been reattention,and it has gradually increased in engineering applications.But the equivalent problem of soil between piles is still need to be improved in the existing calculation model of double-row piles.This paper tried to discuss the equivalent model of soil between piles from three different points based on calculation model of current professional technical specifications,and three improved calculation models of double-row piles for foundation pit re proposed.Next,based on a brief summary of three improved calculation models,the equivalent model of soil between piles was further improved by introducing the equivalent truss model,and a calculation model of double-row piles in foundation pit was proposed based on equivalent truss model.Then,the rationality of four improved calculation models were verified through a specific numerical example.By contracting the analysis result of four calculation models,it’s concluded that the calculation model of double-row piles based on equivalent truss model is more reasonable.Finally,the improved computational model based on equivalent truss model was applied to a practical case in Kunming.Through analysis of working condition and compressibility of soil and between piles,the stress and deformation characteristics of the double-row piles retaining structure are discussed,which is designed to provide some reference for theoretical research and engineering application of double-row piles.

关 键 词：基坑 双排桩支护 桩间土 改进计算模型 变形特性 

分 类 号：TU311[建筑科学—结构工程]