运用国际岩土数值软件FLAC3D建立武汉地铁二号线名都车站基坑模型,并对比现场监测数据,研究该地铁基坑开挖引起的变形规律。结果表明:数值分析结果与现场监测成果吻合;高楼层的保利华都因其基础为桩基础,故地铁基坑开挖后沉降位移较小,其侧基坑地表沉降曲线呈“三角形”;低矮楼层的西藏中学因其基础为条形浅基础,故地铁基坑开挖后沉降位移较大,其侧基坑地表沉降曲线呈“阶梯状”。对比现场监测成果与数值模拟分析结果,数值模拟可较好地分析了解基坑开挖引起的变形规律,从而为信息化施工、基坑支护方案的修正提供有效合理的依据。
Abstract
FLAC3D was employed to establish the numerical model of the foundation pit of Mingdu station of Wuhan subway line 2. By comparing the numerical analysis with field monitoring data, we analyzed the regularity of deformation caused by excavation. Results show that numerical analysis is consistent with field monitoring results. High-rise building Baolihuadu in the north of the foundation pit suffers small settlement owing to its pile foundation, and the settlement curve of the side-pit’s ground surface displays a triangle shape; while Tibetan school in the south undergoes large settlement because of its strip shallow foundation, with stepped settlement curve of the side-pit’s ground surface. The numerical simulation analysis could well reflect the deformation regularity, and could provide effective and reasonable basis for the informatized construction and the modification of foundation pit support scheme.
关键词
FLAC3D /
地铁基坑 /
变形规律 /
数值模拟分析
Key words
Fast Lagrangian Analysis of Continua in 3-dimensions (FLAC3D) /
subway foundation pit /
deformation regularity /
numerical simulation analysis
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 江晓峰,刘国彬,张伟立,等.基于实测数据的上海地区超深基坑变形特性研究[J].岩土工程学报,2010,32(增2):570-573. (JIANG Xiao-feng, LIU Guo-bin, ZHANG Wei-li, et al. The Research on Deformation Characteristics of Super Deep Foundation Pit Based on the Measured Data in Shanghai[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(Sup.2): 570-573.(in Chinese))
[2] 刘宝琛.综合利用城市地面及地下空间的几个问题[J].岩石力学与工程学报,1999,18(1):109-111. (LIU Bao-chen. A Few Questions about the Comprehensive Utilization of the Urban Ground and Underground Space[J]. Chinese Journal of Rock Mechanics and Engineering, 1999,18(1):109-111. (in Chinese))
[3] 柳建国,程良奎.北京地区基坑支护技术的发展与工程实践[J].岩土力学,2009,30(4):1013-1017. (LIU Jian-guo, CHENG Liang-kui. Pit Support Technology Development and Engineering Practice in Beijing[J]. Rock and Soil Mechanics,2009,30(4):1013-1017. (in Chinese))
[4] Terzaghi. K,Peck R B. Soil Mechanics Engineering Practice[M]. New York ,1948.
[5] 王 霆,刘维宁,张成满,等. 地铁车站浅埋暗挖法施工引起地表沉降规律研究[J]. 岩石力学与工程学报,2007,26(9):1855-1861. (WANG Ting,LIU Wei-ning,ZHANG Cheng-man,et al. Study of Ground Settlement Induced by Shallow Metro Station Constructions[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(9):1855-1861.(in Chinese))
[6] 韩 煊. 隧道施工引起地层位移及建筑物变形预测的实用方法研究[D]. 西安:西安理工大学,2006. (HAN Xuan. The Analysis and Prediction of Tunneling-induced Building Deformations[D]. Xi’an:Xi’an University of Technology,2006. (in Chinese))
[7] 孟 丹,臧晓光,于广明,等.地铁车站开挖引起地表沉降分析方法的对比研究[J].岩石力学与工程学报,2012,31(6): 1169-1178. (MENG Dan,ZANG Xiao-guang,YU Guang-ming, et al. Comparative Study of Analytical Methods for Round Surface Settlement Induced by Subway Station Construction[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(6): 1169-1178. (in Chinese))
[8] 张爱英.基坑开挖对邻近建筑物影响的数值模拟分析[D].西安:西安科技大学,2008. (ZHANG Ai-ying. Numerical Analysis of the Adjacent Structure in Foundation Excavation Engineering[D]. Xi’an:Xi’an University of Science and Technology,2008.(in Chinese))
[9] 曾 远, 李志高, 王毅斌. 基坑开挖对邻近地铁车站影响因素研究[J]. 地下空间与工程学报, 2005, 8(4): 642-645. (ZENG Yuan, LI Zhi-gao, WANG Yi-bin. Research on Influencing Factors of Deep Excavation Adjacent to Subway Station[J]. Chinese Journal of Underground Space and Engineering, 2005, 8(4): 642-645. (in Chinese))
基金
国家自然科学基金面上项目(41172281);973计划项目(2011CB710604);中央高校摇篮人才计划(CUGL100413);中央高校特色学科团队(CUG090104)
PDF(4526 KB)
