基于正交试验的围护结构变形影响因素

doi:10.12066/j.issn.1007-2861.1950

摘要/Abstract

摘要：

深基坑开挖可能引起围护结构与周围土体的变形, 而这些变形对各种影响因素具有不同的敏感程度. 以上海长江西路越江隧道新建工程为例, 根据实际土层分布建立了里程 NK0+534.100 处基坑体系横截面的几何模型, 使用有限元分析软件 ABAQUS 进行了基坑开挖过程的数值模拟, 分析了基坑施工过程中地下连续墙水平位移随深度的变化特征, 对比研究了现场监测数据与数值模拟结果. 选取地下连续墙厚度、窄基坑开挖深度、窄基坑开挖宽度 3 个影响因素, 并对每个因素取 3 个水平, 使用正交试验和正交表 L$_{9}$(3$^{4})$ 实现了 9 种不同情况的数值模拟试验, 并基于这些因素对地下连续墙水平位移的影响进行极差分析和方差分析. 结果表明: 数值模拟结果与现场监测数据吻合程度较好; 对地下连续墙水平位移影响程度由大到小的因素依次为地下连续墙厚度、窄基坑开挖深度、窄基坑开挖宽度; 地下连续墙厚度-地下连续墙的水平位移呈负相关, 窄基坑开挖宽度、深度-地下连续墙水平位移呈正相关. 研究成果对基坑施工过程中围护结构的变形分析具有一定的参考价值.

关键词: 基坑, 围护结构, 水平位移, 有限单元法, 正交试验

Abstract:

Excavation of deep foundation pit may result in deformation of supporting structures and surrounding soils. These deformations have different sensitivities to different influencing factors. Taking Shanghai Yangtze River Tunnel Project as an example, this study establishes a geometrical model of the foundation pit excavation based on actual soil distributions. The finite element analysis software ABAQUS was used to simulate the excavation process of the foundation pit. Horizontal displacements of the diaphragm wall were examined during excavation. Comparison between the field monitoring data and the simulated ones was made. Three factors influencing horizontal displacement of the diaphragm wall were chosen: thickness of diaphragm wall and width/depth of narrow excavation, and for each factor tree levels were set. Thus a total of 9 numerical simulation tests were performed based on the orthogonal table L$_9$(3$^4$) using an orthogonal test technique. Range analysis and variance analysis were then made. The simulation results are close to the field monitoring data. Factors affecting horizontal displacement of diaphragm wall in a descending order are thickness of diaphragm wall, depth of excavation of narrow foundation pit, and width of excavation of narrow foundation pit. Thickness and horizontal displacement of the diaphragm wall show a positive relation, while width and depth of excavation of the narrow foundation pit and horizontal displacement of the diaphragm wall show a negative relation. The results may provide references in analyzing deformation of retaining structures in foundation pit construction.

Key words: foundation pit, retaining structure, horizontal displacement, finite element method, orthogonal test

中图分类号:

TU473

刘旭, 徐金明, 刘绍峰. 基于正交试验的围护结构变形影响因素[J]. 上海大学学报(自然科学版), 2019, 25(6): 1003-1012.

Xu LIU, Jinming XU, Shaofeng LIU. Exploring factors influencing deformation of retaining structure in orthogonal tests[J]. Journal of Shanghai University（Natural Science Edition）, 2019, 25(6): 1003-1012.

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参考文献 15

[1]	樊胜军, 胡长明, 刘振江 . 某深基坑施工期围护结构变形监测与数值模拟分析[J]. 施工技术, 2010,39(9):82-84.
[2]	姜忻良, 宗金辉, 孙良涛 . 天津某深基坑工程施工监测及数值模拟分析[J]. 土木工程学报, 2007,40(2):79-84.
[3]	李斯海, 张玉军 . 深基坑开挖与支护过程的平面有限元模拟[J]. 岩石力学与工程学报, 1999,18(3):342-345.
[4]	李四维, 高华东, 杨铁灯 . 深基坑开挖现场监测与数值模拟分析[J]. 岩土工程学报, 2011,33(S1):284-291.
[5]	刘杰, 姚海林, 任建喜 . 地铁车站基坑围护结构变形监测与数值模拟[J]. 岩土力学, 2010,31(S2):456-461.
[6]	孙凯, 许振刚, 刘庭金 , 等. 深基坑的施工监测及其数值模拟分析[J]. 岩石力学与工程学报, 2004,23(2):293-298.
[7]	万志辉, 刘红艳, 步艳洁 . 深基坑围护结构变形监测与数值模拟分析[J]. 施工技术, 2015,44(7):83-86.
[8]	武朝军, 陈锦剑, 叶冠林 , 等. 苏州地铁车站基坑变形特性分析[J]. 岩土工程学报, 2010,32(S1):458-462.
[9]	赵海燕, 黄金枝 . 深基坑支护结构变形的三维有限元分析与模拟[J]. 上海交通大学学报, 2001,35(4):610-613.
[10]	Xie X Y, Zhu K W . Development of a three-dimensional modeling method for monitoring overall foundation pit deformation based on terrestrial laser scanning[J]. Applied Mechanics and Materials, 2015,743:866-875.
[11]	董金玉, 黄志全, 马述江 , 等. 基于正交设计和数值分析的夯扩挤密碎石桩加固液化碎土方案优化研究[J]. 岩土工程学报, 2013,35(S2):968-973.
[12]	张伟, 韩旭, 刘杰 , 等. 一种基于正交试验设计的土中爆炸数值模型确认方法[J]. 工程力学, 2013,30(3):58-65.
[13]	黄震, 朱术云, 姜振泉 , 等. 基于正交设计的覆岩移动影响因素敏感性分析[J]. 地下空间与工程学报, 2013,9(1):106-112.
[14]	张慧, 梧松 . 电化学方法加固超软土机理现场试验研究[J]. 建筑科学, 2014,30(11):44-50.
[15]	Liu C, Zhang Z X, Richard A R . Pile and pile group response to tunneling using a large diameter slurry shield-case study in Shanghai[J]. Computer and Geotechnics, 2014,59:21-43.