不同布桩方式对h型双排桩支护结构影响的数值模拟  

Numerical Simulation of the Impact of Different Pile Arrangement on the Supporting Structure of h-Shaped Double-Row Piles

作　　者：詹智麒 徐光黎[1,2] ZHAN Zhiqi;XU Guangli(Institute of Geological Survey,China University of Geosciences (Wuhan),Wuhan 430074,China;Faculty of Engineering,China University of Geosciences (Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)地质调查研究院,湖北武汉430074 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2020年第3期193-199,共7页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41772314)。

摘　　要：h型双排桩是传统门架式双排桩支护结构的一种优化工程方案,相较于传统的双排桩支护结构,其具有结构整体刚度大、受力性能良好、施工成本和难度低等优点,已在基坑工程、滑坡治理工程中得到了广泛的应用。以湖北省某地区深基坑开挖项目为例,利用有限元软件PLAXIS 3D建立采用h型双排抗滑桩作为支护结构的多级开挖的基坑工程三维数值模型,采用平行布置和梅花型布置两种不同布桩方式对h型双排桩支护结构的影响进行了数值模拟计算与对比分析。结果表明:对于h型双排抗滑桩,后排桩承受了大部分的荷载,设计时需对后排桩进行加强;后排桩与连梁连接处桩身弯矩最大,在设计时需重点加强;在其他条件相同时,采用梅花型布置的h型双排桩,其作用效果要优于平行布置,在基坑工程设计时可优先采用,以达到提高安全性且实现经济、合理的目的。The h-shaped double-row piles,an engineering scheme of optimization of traditional gantry type double-row pile supporting structure,offers great structural stiffness,good mechanical properties,low construction cost and easy operation,compared with traditional double-row pile supporting structures,and has been widely used in the foundation pit engineering and landslide control engineering.Taking a deep excavation project in Hubei Province as an example,this paper establishes a three dimensional numerical model of foundation pit engineering with multi-stage excavation using h-shaped double-row piles as supporting structure by the finite element software PLAXIS 3D.The paper numerically simulates and comparatively analyzes the impact of two different pile arrangement ways,namely,parallel arrangement and plum blossom arrangement,on the supporting structure of h-shaped double-row piles.The results show that back row piles bear more load,so the back row piles need to be strengthened in the design;the bending moment of the back row pile at the connection with the contact beam is the largest,which needs to be strengthened in the design;the h-shaped double-row piles with plum blossom arrangement have better effects than those with the parallel arrangement do,which could be prioritized to improve the engineering safety and economy.

关 键 词：基坑工程 h型双排桩 布桩方式 数值模拟 

分 类 号：X948[环境科学与工程—安全科学]