摘要
桩锚支护作为一种在深基坑工程应用范围广泛、支护效果较好的支护形式,具有极大的研究意义。文章以基坑变形基本理论为基础,运用了MIDAS/GTS NX有限元数值模拟软件,以北京某深基坑为研究对象,建立了其桩锚支护结构开挖施工的有限元模型,研究了“围护桩+预应力锚索”支护结构在开挖过程中的基坑以及支护结构变形规律。研究发现基坑分步开挖对其变形会产生非常大的影响,而桩锚支护形式能有效限制支护结构与周围土体的水平位移;坑底隆起值、地表沉降值、桩顶水平位移值均与基坑开挖深度正相关;考虑到基坑变形的时空效应,可以采用分小段、分层开挖支护的方法减小变形。
As a kind of support form with wide application scope and good support effect in deep foundation pit engineering,pile anchor support has great research significance.Based on the basic theory of foundation pit deformation,uses MIDAS/GTS NX finite element numerical simulation software,takes a deep foundation pit in Beijing as the research object,establishes the finite element model of the excavation construction of its pile anchor support structure,and studies the deformation law of the foundation pit and the support structure during the excavation process of the“enclosure pile+prestressed anchor cable”support structure.It is found that the excavation of the foundation pit in steps will have a great impact on its deformation,and the pile anchor support can effectively limit the horizontal displacement of the support structure and the surrounding soil;The heave value of the pit bottom,the surface settlement value and the horizontal displacement value of the pile top are all positively correlated with the excavation depth of the foundation pit;Considering the time-space effect of foundation pit deformation,the method of excavation and support in sections and layers can be adopted to reduce the deformation.
作者
林文利
曾启强
刘金水
颜港归
梁高
LIN Wenli;ZENG Qiqiang;LIU Jinshui;YAN Ganggui;LIANG Gao(Guangzhou Urban Planning Survey and Design Institute,Guangzhou 510060,China;Hainan Haida Engineering Testing Technology Co.,Ltd.,Haikou 570228,China)
出处
《广东土木与建筑》
2023年第3期51-53,92,共4页
Guangdong Architecture Civil Engineering
关键词
深基坑工程
基坑变形
桩锚支护
数值模拟
有限元法
deep foundation pit engineering
deformation of foundation pit,pile anchor support
numerical simulation,finite element
作者简介
林文利(1995-),男,硕士研究生,助理工程师,主要从事有关工程地质与岩土工程研究。E-mail:960098951@qq.com。
