狭窄黏性填土刚性挡墙主动土压力研究

应宏伟; 朱伟; 黄东; 谢新宇; 李冰河

狭窄黏性填土刚性挡墙主动土压力研究 English Version

应宏伟^1,2,
朱伟^1,2,
黄东³,
谢新宇^1,2,
李冰河⁴

(1. 浙江大学岩土工程研究所，浙江杭州 310058；2. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310058；3. 华润置地（成都）有限公司，四川成都 610066；4. 浙江省建筑设计研究院，浙江杭州 310008)

详细信息

作者简介:
应宏伟(1971– )，男，江西萍乡人，博士，副教授，主要从事岩土工程的教学与科研工作。

中图分类号: TU476
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Active earth pressures against rigid retaining walls with narrow cohesive backfill

(1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. MOE, Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 3. China Resources Land (Chengdu) Limited, Chengdu 610066, China; 4. Institute of Architectural Design and Research, Hangzhou 310008, China)

摘要

摘要: 对于临近既有地下室或竖直基岩面的挡土墙，由于墙后填土宽度有限，采用经典的库伦、朗肯土压力理论计算挡土墙主动土压力是不合适的。采用有限元分析软件ABAQUS，对狭窄黏性填土刚性挡土墙的主动土压力问题进行研究，探讨了墙后土体的临界裂缝深度和滑裂面的发展规律。考虑墙土之间的黏着力和填土竖向裂缝，建立新的理论分析模型，得到了挡土墙水平主动土压力合力的求解方法和主动土压力分布的解析公式。土压力合力系数与土压力强度的理论解和数值解吻合较好，验证了本文理论解的合理性。研究表明，主动极限状态下，填土表面两侧均将产生竖向裂缝，且临界裂缝深度不随填土宽度变化，其值与朗肯裂缝深度接近；随着填土宽度的减小，填土内将产生一道甚至多道滑裂面，挡土墙主动土压力也从基于半无限土体假定的广义库伦土压力值逐渐减小。
- 刚性挡墙 /
- 主动土压力 /
- 黏性填土 /
- 数值分析 /
- 解析方法
Abstract: In the case of a retaining wall adjacent to an existing basement or a vertical rock face, the width of backfill is limited. So it is not appropriate to use the Coulomb or Rankine theory to calculate the active earth pressures on the retaining wall. The software ABAQUS is used to execute the numerical simulation of active earth pressures on the rigid retaining wall with narrow cohesive backfill. The critical depth of the vertical cracks and the slip surfaces in the backfill are discussed. Based on the numerical analysis results, a new theoretical model is presented considering the adhesion between the wall and the fill as well as the vertical cracks in the fill. The formulae of the resultant force coefficient and the distribution of the active earth pressures on the retaining wall are put forward. The comparison between the theoretical and the numerical results demonstrate the rationality of the proposed theory. It is shown that the vertical cracks will appear at both sides of the fill, and the critical depth of the cracks, which do not change with the fill width, is approximately equal to the magnitude obtained by the Rankine theory. It is also shown that the one or multiple slip surfaces will occur in the fill as the width of the fill decreases. Furthermore, the active earth pressures on the retaining wall will decrease gradually from the magnitude obtained by the generalized Coulomb theory, which is based on the semi-infinite boundary assumption, to zero when the width of the fill decreases continuously. |
- rigid retaining wall /
- active earth pressure /
- cohesive backfill /
- numerical simulation /
- analytical method

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参考文献(13)

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