考虑邻近地下结构影响的基坑变形三维数值分析

发布时间：2018-03-01 15:07

本文关键词： 基坑有限宽度土体地铁车站立柱桩横墙数值分析　出处：《上海交通大学学报》2016年11期 　论文类型：期刊论文

【摘要】：基于摩尔库伦弹塑性本构,提出了考虑土体小应变刚度特征的数值分析方法,并在有限差分软件FLAC3D中实现二次开发.将提出的数值方法用于模拟某基坑的施工过程,该基坑邻近既有地铁车站,且坑内外分别存在横墙和立柱桩.将数值计算结果与实测数据进行对比,验证所提出的数值方法的有效性.进一步对比分析了有无立柱桩和坑内横墙时围护墙的变形特性.研究表明,由于基坑与车站间的土体宽度大于临界宽度值,其围护墙变形不受邻近车站地下结构的影响;立柱桩的存在能够减小主动区土压力,坑内横墙增加了被动区的抗力,使得围护墙变形明显减小.
[Abstract]:Based on Moore Coulomb elastoplastic constitutive equation, a numerical analysis method considering the characteristics of small strain stiffness of soil is proposed, and the secondary development is realized in the finite difference software FLAC3D. The numerical method is used to simulate the construction process of a foundation pit. The foundation pit is adjacent to the existing subway station, and there are transverse walls and vertical piles inside and outside the pit. The numerical results are compared with the measured data. The effectiveness of the proposed numerical method is verified. Furthermore, the deformation characteristics of the retaining wall with or without the vertical column pile and the transverse wall in the pit are compared and analyzed. The results show that the soil width between the foundation pit and the station is larger than the critical width. The deformation of the retaining wall is not affected by the underground structure of the adjacent station, the existence of the column pile can reduce the earth pressure in the active zone, the resistance of the passive zone is increased by the transverse wall in the pit, and the deformation of the retaining wall is obviously reduced.
【作者单位】：山东省建筑科学研究院;泰安市工程质量检测中心;
【分类号】：TU753

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