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软黏土中某内支撑式深基坑稳定性安全系数分析

李忠超, 陈仁朋, 陈云敏, 饶猛

李忠超, 陈仁朋, 陈云敏, 饶猛. 软黏土中某内支撑式深基坑稳定性安全系数分析[J]. 岩土工程学报, 2015, 37(5): 769-775. DOI: 10.11779/CJGE201505001
引用本文: 李忠超, 陈仁朋, 陈云敏, 饶猛. 软黏土中某内支撑式深基坑稳定性安全系数分析[J]. 岩土工程学报, 2015, 37(5): 769-775. DOI: 10.11779/CJGE201505001
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LI Zhong-chao, CHEN Ren-peng, CHEN Yun-min, RAO Meng. Factor of safety of a braced deep excavation in soft clay[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 769-775. DOI: 10.11779/CJGE201505001
Citation: LI Zhong-chao, CHEN Ren-peng, CHEN Yun-min, RAO Meng. Factor of safety of a braced deep excavation in soft clay[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 769-775. DOI: 10.11779/CJGE201505001
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软黏土中某内支撑式深基坑稳定性安全系数分析  English Version

  • 1. 浙江大学软弱土与环境土工教育部重点实验室,浙江 杭州 310027; 2. 华东建设工程有限公司,浙江 杭州 310030

基金项目: 国家自然科学基金项目（51225804,U1234204）
详细信息
    作者简介:

    李忠超(1987- ),男,博士研究生,主要从事软土地区深基坑及盾构隧道工程对周围环境影响的研究。E-mail: 10912014@zju.edu.cn。

  • 中图分类号: TU47

Factor of safety of a braced deep excavation in soft clay

  • 1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. East China Construction Engineering Corporation of Zhejiang, Hangzhou 310030, China

摘要

    摘要
  • 摘要: 软黏土中深基坑稳定性安全系数是基坑设计的重要指标,目前基坑稳定性安全系数评估方法主要有传统经验公式法和有限元强度折减法。针对深厚软黏土中某倒塌内支撑式深基坑,采用传统经验公式法和有限元强度折减法对该基坑稳定性安全系数FS进行了计算分析,比较了不同土体强度指标计算结果的差异,结合其它学者的研究,对各计算方法及其所采用土体强度指标的合理性进行了评价。研究结果表明：无论是应用经验公式法还是有限元强度折减法,采用不排水抗剪强度指标su计算得到的基坑FS均比较接近1.0,而采用土体c, 强度指标得到基坑FS均远大于1.0。应用有限元强度折减法时,数值计算不收敛准则相对交点法得到基坑FS偏大。采用交点法与Terzaghi法得到基坑FS最接近1.0,与基坑处于极限平衡状态事实相符。
    Abstract: The factor of safety (FS) is a very important design index for deep excavation in soft clay. The existing methods for FS mainly include the conventional methods and finite element method (FEM) based on the reduced shear strength technique. In this study, the conventional methods and reduced shear strength FEM are used for FS evaluation of a failed deep excavation in soft clay. By comparing the values of FS of the excavation using different soil strength parameters and methods, the applicability of the analysis methods and soil strength parameters is evaluated. The research results indicate that the values of FS of the excavation calculated by the conventional methods and the reduced shear strength FEM using the total stress indexes, i.e., su, =0, are very close to 1.0 and those from Terzaghi’s method, while the values of FS of the excavation are much greater than 1.0 using the soil strength parameters c and from triaxial tests. When the reduced shear strength FEM is applied for FS evaluation, the values of FS obtained from the convergence criterion method are much greater than those from the intersection method. The values of FS of the excavations using the intersection method and Terzaghi’s method are both very close to 1.0, which is consistent with the limited equilibrium state of the excavations at failure.
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出版历程
  • 收稿日期:  2014-04-21
  • 发布日期:  2015-05-19

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