›› 2017, Vol. 38 ›› Issue (3): 875-882.doi: 10.16285/j.rsm.2017.03.033

• 数值分析 • 上一篇    下一篇

一种基于强度折减法的刚性桩复合地基整体稳定性评价方法研究

闫 超1, 2, 3,刘松玉1, 2,邓永锋1, 2   

  1. 1. 东南大学 岩土工程研究所,江苏 南京 210096;2. 江苏省城市地下工程与环境安全重点实验室,江苏 南京 210096; 3. 安徽大学 资源与环境工程学院,安徽 合肥 230039
  • 收稿日期:2015-04-12 出版日期:2017-03-11 发布日期:2018-06-05
  • 作者简介:闫超,男,1985年生,博士,主要从事地基处理、地下空间技术方面的研究工作。
  • 基金资助:

    国家自然科学基金(No.41330641);国家自然科学基金(No.51279032)。

A method of evaluating integral stability of rigid pile composite foundation based on strength reduction method

YAN Chao1, 2, 3, LIU Song-yu1, 2, DENG Yong-feng1, 2   

  1. 1. Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 2. Key Laboratory of Urban Underground Engineering and Environmental Safety of Jiangsu Province, Nanjing, Jiangsu 210096, China; 3. School of Resource and Environment Engineering, Anhui University, Hefei, Anhui 230039, China
  • Received:2015-04-12 Online:2017-03-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41330641) and the National Natural Science Foundation of China (51279032).

摘要: 当前在评价复合地基稳定性时通常采用极限平衡法进行分析,即采用复合地基理论,把刚性桩的黏结力和摩擦角等效为地基整体的黏聚力和内摩擦角,然后采用圆弧条分法计算其整体安全系数。显然,该计算方法假定了桩体与土体皆发生剪切破坏。但相关研究成果表明,群桩中存在多种破坏模式,单纯采用剪切破坏模式计算出的安全系数可能偏安全。从刚性群桩的实际破坏模式出发,提出一种适用于刚性桩破坏特征的强度折减法,即通过强度折减法搜索复合地基系统的临界状态时,刚性桩的破坏模式应符合实际破坏情况。同时,根据刚性桩的变形破坏特征,探讨强度折减法临界状态判别方法,通过算例比较只折减抗剪切强度参数和笔者所提方法的差异,验证了本文方法的可行性和合理性。

关键词: 强度折减法, 复合地基, 安全系数, 稳定性评价

Abstract: At present the limit equilibrium method is generally used to evaluate the stability of composite foundation. In this procedure, the composite foundation theory assumes the cohesion and friction angle of rigid pile are equivalent to that of the whole foundation, and then the safety factor of the whole foundation is obtained by circular slice method. This theory considers the shear failure at critical state for all rigid pile and the soil. However, according to the relevant research results, shear failure is not exclusive for group piles, and the safety factor based on the shear failure mode may tend to be overestimated. Based on the actual failure mode of rigid pile group, a strength reduction method is developed for rigid pile failure. That is, when the critical state of composite foundation system is searched by strength reduction method, the failure mode of rigid pile should meet the actual damage. At the same time, on the basis of the deformation and failure characteristics of the rigid pile, methods for identifying critical state are discussed. The feasibility and validity of the proposed method are verified through comparing the proposed method and the traditional method only considering shear failure.

Key words: strength reduction method, composite foundation, safety factor, stability evaluation

中图分类号: 

  • TU 457

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