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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第1期    总第63期    2015年2月

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文章编号:1672-7029(2015)01-0086-05
L形基坑变形的空间效应研究
阮波1,田晓涛1,杨关文1,2

(1. 中南大学 土木工程学院,湖南 长沙 410075;
2. 贵州正业工程技术投资有限公司,贵州 贵阳550000
)

摘 要: 依托长沙市潮宗御苑小区深基坑工程,利用有限差分软件FLAC3D建立了L形基坑的三维数值计算模型,对基坑的开挖过程进行模拟,研究土体以及支护结构位移的空间分布规律,讨论位移空间分布的影响因素,并将数值计算结果与实测值进行对比分析。研究结果表明:基坑各边中部位移最大,阳角处位移次之,阴角处位移最小;空间效应的影响范围随着基坑开挖深度增加而增大,但增幅逐渐减小, 一般为2~3倍基坑开挖深度;冠梁能够有效控制基坑的角部位移的发展,尤其是阳角处位移,并能够增加空间效应的影响范围。

 

关键字: 倒L形基坑;变形;空间效应;数值模拟

Research on spatial effect of deformation in L-shaped foundation pit
RUAN Bo1,TIAN Xiaotao1,YANG Guanwen1,2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Zhengye Engineering & Investment Incorporation Limited, Guiyang 550000, China

Abstract:Based on the deep foundation pit of Chao Zong Yu Yuan district in Changsha city, a three-dimensional numerical model was established for L-shaped foundation pit using finite difference software FLAC3D, and the construction process was simulated. The spatial distribution law of deformation for soils and retaining structures was analyzed, and the influencing factors were discussed as well. Meanwhile, the calculated results were then compared with field measured data. The results show that the maximum displacement occurs in the central of each side, followed by the displacement of positive corner, and the displacement of negative corner is minimum. The coverage range of spatial effects increases with the increasing value of excavation depth, while the growth rate decreases gradually. In general, the influencing scope is 2 to 3 times of the depth of excavation. The top beam can effectively limit the displacement around corner especially the positive corner of the pit, and increase the coverage range of spatial effects.

 

Key words: reverse L-shaped pit; displacement; spatial effect; numerical simulation

ISSN 1672-7029
CN 43-1423/U

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