
96
D01:10.7672/sgjs2015110096
施工技术
CONSTRUCTION TECHNOLOGY
2015年6月上第44卷第11期
双排桩受力变形规律及影响因素有限元分析
周鹏华",黄晓程",2
(1.中建三局集团有限公司工程总承包公司,潮北武汉430064;2.溯北中建三局建筑工程技术有限责任公司,
湖北武汉430070)
[摘要】以武汉市凯德广场深基坑工程双排桩支护结构为依托,采用MidasCTSNX软件对其进行数值仿真模拟分析。得到桩间加固和无加固双排桩桩身位移随深度变化曲线,分析其各自变化规律及异同点;得到两者桩身应力随深度变化曲线,分析其各自变化规律及异同点,及桩间土加固对桩身受力产生的影响;分析得到预留土土体力学性质对桩间加固和无加固双排桩位移的影响;同时分析了桩间加固土体弹性模量E、黏聚力c值单独变化对桩身位移产生的影响,以及两参数同时变化对身位移影响。
【关键词]基坑;双排桩;预留土体;位移;应力;有限元分析
【中图分类号】TU753
【文献标识码]A
【文章编号】1002-8498(2015)11-0096-05
FiniteElement Analysis of Deformation Law and Influencing Factors for
Double-row Piles
Zhou Penghua',Huang Xiaocheng'2
(1. General Construction Company of CCTEB Group Co.,Lid.,Wuhan,Hubei 430064,China;
2. Hubei Building Construction Technology Co. ,Lad. of CCTEB Group Co. ,Lad.,Wuhan,Hubei 430070,Chine)
Abstract:Based on the double-row piles supporting structure in deep foundation excavation of Wuhan Cade Square, numerical simulation analysis of double-row piles supporting structure is completed by software Midas GTS NX. The displacement curves are obtained with depth variation of double-row piles which are strengthened and are not strengthened between piles. This paper analyzes the variation law and the same or different points, and the stress variation curves are obtained with depth variation of pile body. This paper analyzes the variation law and the same or different points, and the impact of strengthening between piles on pile body's stress; analyzes the impact of reserved soil' mechanical properties on the displacement of double-row piles which are strengthened and are not strengthened between piles; and analyzes the impact of the E and c values' individual change of reinforced soil between piles on pile's displacement, and the impact of the two parameters' simultaneous change on pile's displacement.
Key words: foundation excavation;double-row piles; reserved soil; displacement; stresses;finite element analysis
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引言
近年来,随着高层建筑和各类地下工程的大量
兴建,深基坑支护结构越来越引起工程技术人员的重视。双排桩是一种新型的围护结构,它是由两排平行的钢筋混凝土桩以及桩顶的冠梁、桩间的连梁形成的空间门架式组合结构体系。这种结构具有较大的侧向刚度,可以有效限制围护结构的侧向变
【作奢简介】周鹏华,高级工程师,E-mail;154713918@q9.com
[收稿日期】2014-12-29 万方数据
形,因而其围护深度比一般悬臂式围护结构深。与单排悬臂结构、内撑式围护结构相比,其具有施工方便、不用设置内支撑、挡土结构受力条件好等优点,因此在工程中得到广泛应用。
目前,双排桩已有不少计算模型,基于不同的假定,归纳起来主要有3大类:一是根据经典土压力理论确定土压力的计算模型,如修正系数法、体积比例系数法、桩间土刚塑体法等,这些方法主要缺点是其假定与实际工程有较大出人,且难以估算支