›› 2015, Vol. 36 ›› Issue (8): 2307-2314.doi: 10.16285/j.rsm.2015.08.025

• 基础理论与实验研究 • 上一篇    下一篇

条形基础加筋砂土地基极限承载力计算

刘拴奇1, 2,卢坤林1, 3,朱大勇1, 3,吴迎雷1, 3,甘文宁1, 4   

  1. 1.合肥工业大学 土木与水利工程学院,安徽 合肥 230009;2.机械工业勘察设计研究院有限公司,陕西 西安 710048; 3.合肥工业大学 安徽土木工程结构与材料省级试验室,安徽 合肥 230009;4.广西壮族自治区水利电力勘测设计研究院,广西 南宁 530023
  • 收稿日期:2014-09-15 出版日期:2015-08-11 发布日期:2018-06-13
  • 通讯作者: 卢坤林,男,1980年生,博士,副教授,主要从事岩土稳定理论与工程方面的研究工作。E-mail: lukunlin@hfut.edu.cn E-mail:liushuanqi@163.com
  • 作者简介:刘拴奇,男,1987年生,硕士研究生,主要从事岩土稳定理论与工程方面的研究工作
  • 基金资助:
    国家自然科学基金资助项目资助(No. 51078123,No. 51179043,No. 41402256)

A method for calculating the ultimate bearing capacity of a strip footing on the reinforced sand

LIU Shuan-qi1, 2, LU Kun-lin1, 3, ZHU Da-yong1, 3, WU Ying-lei1, 3, GAN Wen-ning1, 4   

  1. 1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, China; 2. China Jikan Research Institute of Engineering Investigations and Design, Co., Ltd., Xi’an, Shaanxi 710048,China; 3. Anhui Provincial Laboratory of Civil Engineering and Materials, Hefei University of Technology, Hefei, Anhui 230009, China; 4. Guangxi Water and Power Design Institute, Nanning, Guangxi 530023, China
  • Received:2014-09-15 Online:2015-08-11 Published:2018-06-13

摘要: 基于传统的极限平衡条分法,利用临界滑动场法计算了条形基础的加筋地基极限承载力。假定土体处于极限平衡状态时,土体与筋材间存在均匀的摩擦力,通过建立土体条块极限平衡方程,推导了地基承载力的递推关系式。首先,设定计算土体范围,并划分条块和离散状态点;其次,根据递推公式计算各个状态点的参数,并搜索临界滑面;最后,根据搜索出的滑面计算地基承载力。通过实例比较进一步验证了计算结果的可靠性,并分析了首层筋带埋深、铺设层数和长度对地基承载力和滑面位置的影响。研究结果表明:地基承载力随着筋带埋深的增加先增大后减小;随着层数和长度的增加先逐渐增大,最后趋于稳定;滑面位置的变化规律主要是垂直影响深度和水平影响范围增大或减小。该方法原理简单、易于编程,为条形基础加筋地基承载力的计算提供了一种新思路,是临界滑动场法在地基承载力计算中的推广应用。

关键词: 条形基础, 加筋地基, 极限承载力, 极限平衡法, 条分法

Abstract: The ultimate bearing capacity of a strip footing on the reinforced sand is studied based on both the limit equilibrium slice method and the critical slip field method. It is assumed that friction of the interface between the soil and reinforcements is uniform when the reinforced foundation soil is in the limit equilibrium state. Based on the limit equilibrium equations of soil slice, a recursion expression of slice force is derived. Firstly, the borders of the soil mass with potential sliding are determined, then soil mass is divided into a series of slices, and the state points is distributed on interfaces between the slices. Secondly, the recursion expression is used to calculate the parameters of all state points and search the critical slip surface. Finally, the bearing capacity can be determined according to the critical slip surface which meets the balance of forces and moments. The reliability of calculation results is shown by comparing with the results in literature. Effects of distance from footing bottom to top reinforcement, layer numbers and length of reinforcement on bearing capacity and slip surface are also presented. The results show that the bearing capacity increases firstly and then decreases as the depth increases, or it increases firstly and becomes stable lastly as layer number and length increase. It is also shown that the slip surface changes mainly in the vertical and horizontal ranges. Because the proposed method is easy to understand and numerically implement, it provides a new idea to calculate the bearing capacity of strip footing on reinforced sand, and it extends the critical slip field method to the calculation of bearing capacity.

Key words: strip footing, reinforced foundation, ultimate bearing capacity, limit equilibrium method, slice method

中图分类号: 

  • TU 470+.1
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