岩土力学 ›› 2019, Vol. 40 ›› Issue (12): 4848-4856.doi: 10.16285/j.rsm.2018.1861

• 岩土工程研究 • 上一篇    下一篇

各向异性软土基坑抗隆起稳定极限平衡分析

周建1, 2,蔡露1, 3,罗凌晖1, 2,应宏伟1, 2   

  1. 1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058;2. 浙江大学 浙江省城市地下空间开发工程技术研究中心,浙江 杭州 310058; 3. 苏州常宏建筑设计研究院有限公司姑苏分公司,江苏 苏州 215000
  • 收稿日期:2018-10-08 出版日期:2019-12-11 发布日期:2020-01-04
  • 作者简介:周建,女,1970年生,教授,主要从事软黏土力学、软土地基处理、非饱和土本构模型等方面的研究工作。
  • 基金资助:
    2016国家重点研发计划课题(No.2016YFC0800203);国家自然科学基金重点项目(No.51338009)

Limit equilibrium analysis of anisotropic soft clay stability against excavation basal heave

ZHOU Jian1, 2, CAI Lu1, 3, LUO Ling-hui1, 2, YING Hong-wei1, 2   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou, Zhejiang 310058, China; 3. Suzhou Changhong Architectural Design and Research Institute Co., Ltd., Gusu Branch, Suzhou, Jiangsu 215000, China
  • Received:2018-10-08 Online:2019-12-11 Published:2020-01-04
  • Supported by:
    This work was supported by 2016 National Key R&D Program(2016YFC0800203) and the Key Project of National Natural Science Foundation of China(51338009).

摘要: 土体的各向异性与沉积环境和应力历史密切相关。以能够考虑土体特性的各向异性不排水抗剪强度公式为基础,利用圆弧滑动方法,并考虑破坏面上强度的折减( ),推导各向异性软土基坑抗隆起稳定极限平衡解。对软土基坑抗隆起稳定进行研究,系统分析了开挖深度H、围护结构插入深度D、最下道支撑与坑底相对距离He/H等几何因素及土体有效内摩擦角 、各向异性强度比k及强度沿深度非均质变化的斜率 等强度参数的影响。最后结合工程实例,验证了公式的适用性,为软土基坑工程抗隆起分析提供了新的思路。

关键词: 软土, 不排水抗剪强度, 各向异性强度比, 圆弧滑动方法, 大主应力轴方向角

Abstract: The anisotropic properties of soft clays are closely related to the sedimentary environment and stress history. Based on a theoretical formula of anisotropic undrained shear strength which take soft clay characteristics into account, this paper analyzes the soft clay stability against basal heave with slip circle method with consideration of strength reduction on the failure surface. The considered strength reduction formula can be expressed as , which means shear strength on the failure surface equals to the undrained shear strength times the cosine value of effective internal friction angle. Stability against basal heave of excavation is studied. Based on a number of examples, the influences of geometrical factors such as the excavation depth H, embedded depth D, and relative distance of the lowest support to the pit bottom He/H are analyzed. Strength factors such as the effective internal friction angle , anisotropic strength ratio k and slope of heterogeneous shear strength versus depth are also investigated. Finally, the applicability of the formula is verified by the engineering example. This paper provides a new idea for the stability analysis against excavation basal heave.

Key words: sofy clay, undrained shear strength, the anisotropy strength ratio, the arc sliding method, principal stress axis angle

中图分类号: 

  • TU447
[1] 姚宏波, 李冰河, 童磊, 刘兴旺, 陈卫林. 考虑空间效应的软土隧道上方卸荷变形分析[J]. 岩土力学, 2020, 41(7): 2453-2460.
[2] 瑜璐, 杨庆, 杨钢, 张金利. 塑性极限分析鱼雷锚锚尖贯入阻力[J]. 岩土力学, 2020, 41(6): 1953-1962.
[3] 张雪东, 蔡红, 魏迎奇, 张紫涛, 梁建辉, 胡晶. 基于动力离心试验的软基尾矿库地震响应研究[J]. 岩土力学, 2020, 41(4): 1287-1294.
[4] 王国辉, 陈文化, 聂庆科, 陈军红, 范晖红, 张川, . 深厚淤泥质土中基坑开挖对基桩 影响的离心模型试验研究[J]. 岩土力学, 2020, 41(2): 399-407.
[5] 贺志军, 雷皓程, 夏张琦, 赵炼恒. 多层软土地基中单桩沉降与内力位移分析[J]. 岩土力学, 2020, 41(2): 655-666.
[6] 雷华阳, 胡垚, 雷尚华, 祁子洋, 许英刚, . 增压式真空预压加固吹填超软土微观结构特征分析[J]. 岩土力学, 2019, 40(S1): 32-40.
[7] 张治国, 李胜楠, 张成平, 王志伟, . 考虑地下水位升降影响的盾构施工诱发地层 变形和衬砌响应分析[J]. 岩土力学, 2019, 40(S1): 281-296.
[8] 叶观宝, 郑文强, 张 振, . 大面积填土场地中摩擦型桩负摩阻力分布特性研究[J]. 岩土力学, 2019, 40(S1): 440-448.
[9] 龚文惠, 赵旭东, 邱金伟, 李逸, 杨晗. 饱和软土大应变自重固结非线性分析[J]. 岩土力学, 2019, 40(6): 2099-2107.
[10] 张 奎, 赵成刚, 李伟华. 海底软土层对海洋地基场地动力响应的影响[J]. 岩土力学, 2019, 40(6): 2456-2468.
[11] 蒲诃夫, 宋丁豹, 郑俊杰, 周 洋, 闫 婧, 李展毅. 饱和软土大变形非线性自重固结模型[J]. 岩土力学, 2019, 40(5): 1683-1692.
[12] 邱 敏, 袁 青, 李长俊, 肖超超, . 基于孔穴扩张理论的黏土不排水抗剪强度 计算方法对比研究[J]. 岩土力学, 2019, 40(3): 1059-1066.
[13] 杨爱武, 潘亚轩, 曹 宇, 尚英杰, 吴可龙, . 吹填软土低位真空预压室内试验及其数值模拟[J]. 岩土力学, 2019, 40(2): 539-548.
[14] 杨鹏, 蒲诃夫, 宋丁豹. 竖井地基的大应变固结分析[J]. 岩土力学, 2019, 40(10): 4049-4056.
[15] 吴建涛, 叶 霄, 李国维, 蒋 超, 曹雪山, . 高路堤下PHC桩加固软土地基的承载及变形特性[J]. 岩土力学, 2018, 39(S2): 351-358.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!