双排桩支护结构性状空间效应的非线性有限元分析论文.pdf

摘要双排桩支护结构作为一种新型的支护形式,由于其具有减少内支撑、增加施工工作面等多方面优点,近年来在工程中得到了广泛的应用。但是其受力机理仍不明确,计算方法尚不成熟,尤其是对于如何在设计中有效的考虑其空间效应的影响尚需进一步研究论证。因此,本文对于空间效应下深基坑双排桩支护结构进行非线性有限元分析。本文首先阐述了双排桩支护结构的主要特点和研究现状,其次基于本文所采用的大型有限元软件PLAXIS对有限元分析原理进行了介绍。本文主要通过对空间效应下深基坑双排桩支护结构进行数值模拟,改变基坑开挖深度、基坑长宽比、双排桩的排距、桩体直径以及结点刚度等模型参数,分析了桩体的变形、内力以及土压力的变化规律。最后,本文得出了一些具有参考价值的结论。根据有限元计算结果,本文总结了在空间效应下双排桩支护结构基坑周边各桩体的变形及受力特点,提出了在双排桩支护设计中各种参数的合理取值范围,并且针对设计中土压力的计算方法提出了一些对于工程实践具有一定指导意义的建议。关键词:双排桩支护结构空间效应有限元土压力 ABSTRACT As a new retaining form,double-row pile retailling stmcture has many advantages, such as reduciIlg supports and increasing working face of the recent years,it was widely applied the stress mechanism is not clear, and the calculation method is not mature· EspeciaUy;how to consider theinfluence ofspatial indesign needs凡rther research deⅡlonstration。Therefore,the Spatial ef-fect on double—row retaining stmctures ofde印foundation pit isanalyzed with nonlinear f-m“e elements inthispapeL Firstly,the main features and research statlls ofdouble-row pileretainmg stmctures are described ,based on thela唱e filliteelement soRware PLAxIS which isused inthispaper,the priIlciple of simulating thespatial ef佗ct on double-row pile retaining stmctures ofde印foundation pit and changing theparameters,such as theeXcaVation deptk ratioofthe foundation p“,thearray pltch ofthe piles,the diameter of the piles and the stiffhess of the variation ofthedeformation,the moment and the eaIrthpressure ofthe piles are 'some conclusions with reference Values are obtained inthispap Based on the resuns of the fmite element analysis,the defIo珊ation and stress characteristics ofthepiles around the p“are reasonable value ranges ofpaurameters in double—row pile retamlng deslgns are some suggestions with guidiIlg significance for engineermg practice ar