非均质地基承载力及破坏模式的FLAC数值分析

›› 2006, Vol. 27 ›› Issue (11): 1909-1914.

非均质地基承载力及破坏模式的FLAC数值分析

赵少飞^1～3，栾茂田^{1, 2}，范庆来^{1, 2}，吕爱钟³，袁凡凡⁴

1. 大连理工大学海岸和近海工程国家重点实验室，大连 116024；2. 大连理工大学土木水利学院岩土工程研究所，大连 116024； 3. 山东科技大学土木建筑学院，青岛 266510；4. 中国科学院武汉岩土力学研究所，武汉 430071

收稿日期:2005-02-21 出版日期:2006-11-10 发布日期:2013-12-04
作者简介:赵少飞，男，1965年生，博士，副教授，主要从事岩土力学基本理论与数值分析等方面的教学与科研工作
基金资助:
国家自然科学基金资助项目(No.50579006, No.50179006)与教育部跨世纪优秀人才培养计划研究基金资助项目(教技函[1998]2号)

FLAC-based numerical analyses of bearing capacity and failure mechanism of strip and circular footings on nonhomogeneous foundations

ZHAO Shao-fei^1－3, LUAN Mao-tian^{1, 2}, FAN Qing-lai^{1, 2}, LÜ Ai-zhong³, YUAN Fan-fan⁴

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. Institute of Geotehnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 3. School of Civil Engineering, Shandong University of Science and Technology, Qingdao 266510, China; 4. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2005-02-21 Online:2006-11-10 Published:2013-12-04

摘要/Abstract

摘要： 利用基于Lagrangian显式差分的FLAC算法，通过数值计算，对黏结力随深度线性增长的非均质地基上条形基础和圆形基础的极限承载力及地基破坏模式进行了对比计算与系统分析。研究表明：(1) 随着地基黏结力沿深度非均匀变化系数的增大，地基的破坏范围逐渐集中在地基表层和基础两侧；(2) 即使地基的非均质程度较小，当将非均质地基近似地按均质地基考虑时，由此所估算的承载力可能过于保守；(3) 地基承载力系数随黏结力沿深度非均匀变化系数的增大而非线性地增大。与数值解相比，Skempton与Peck等近似公式均可能高估了非均质地基承载力。

关键词: 非均质地基, 条形基础, 圆形基础, 极限承载力, Lagrangian显式差分解法

Abstract: Using the FLAC algorithm based on Lagrangian explicit finite difference method, numerical analyses are made on ultimate bearing capacity and failure behavior of strip footings and circular footings founded on nonhomogeneous clays foundations in which soil cohesion increases linearly with depth. Numerical results show that: (1) foundation failure area much more centralizes in surface layer and around footing sides as nonhomogeneous factor kB/c0 increases; (2) bearing capacity are estimated very conservatively if foundation nonhomogeneity is ignored even if kB/c0 is low; (3) bearing capacity factor of footing nonlinearly increases with kB/c0 and interface characteristic of footing and soil has less influence on the bearing capacity shape factor of circular footings except for the homogeneous foundation. Compared with numerical results, it is found that the approximate equations of Skempton and Peck et al. obviously overestimate bearing capacity factor Nc0 for nonhomogeneous soils.

Key words: nonhomogeneous foundation, strip footing, circular footing, ultimate bearing capacity, Lagrangian explicit finite difference procedure

中图分类号:

TU 441

赵少飞，栾茂田，范庆来，吕爱钟，袁凡凡,. 非均质地基承载力及破坏模式的FLAC数值分析[J]. , 2006, 27(11): 1909-1914.

ZHAO Shao-fei , LUAN Mao-tian , FAN Qing-lai , Lü Ai-zhong , YUAN Fan-fan . FLAC-based numerical analyses of bearing capacity and failure mechanism of strip and circular footings on nonhomogeneous foundations[J]. , 2006, 27(11): 1909-1914.

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