›› 2018, Vol. 39 ›› Issue (8): 2913-2921.doi: 10.16285/j.rsm.2016.2479

• 岩土工程研究 • 上一篇    下一篇

考虑附加应力作用的桩锚支护结构稳定性与位移关系研究

周 勇1, 2,令永强1, 2,杨校辉1, 2   

  1. 1. 兰州理工大学 甘肃省土木工程防灾减灾重点实验室,甘肃 兰州 730050; 2. 兰州理工大学 西部土木工程防灾减灾教育部工程研究中心,甘肃 兰州 730050
  • 收稿日期:2016-10-24 出版日期:2018-08-11 发布日期:2018-09-02
  • 作者简介:周勇,男,1978年生,博士,教授,博士生导师,主要从事深基坑开挖支护和边坡加固方面的教学与研究工作
  • 基金资助:

    国家自然科学基金(No.51568042);教育部长江学者和创新团队发展计划(No. IRT_17R51)。

Relationship between the displacement and stability of pile anchor retaining structure considering additional stress

ZHOU Yong1, 2, LING Yong-qiang1, 2, YANG Xiao-hui1, 2   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2016-10-24 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51568042) and the Program for Changjiang Scholars and Innovative Research Team in University (IRT_17R51).

摘要: 桩锚支护结构应用日益广泛,然而在基坑开挖过程中,基于锚杆预应力的基坑稳定性与位移的量化关系尚未解决。同时考虑锚杆预应力引起的附加应力对基坑稳定性和位移的影响,分别得到预应力与桩锚支护结构基坑整体稳定性安全系数、水平位移的计算公式,以及基坑整体稳定性安全系数与水平位移二者之间的关系表达式;通过典型基坑工程实例与现行通用基坑设计软件计算结果进行对比。结果表明:(1)将预应力以附加应力形式来计算基坑整体稳定性安全系数,安全系数随着预应力增加而增加,二者呈非线性关系;(2)以预应力在土体中产生的附加应力形式来计算桩锚支护结构水平位移,支护结构水平位移随着预应力增加而减小,二者呈非线性关系;(3)给出的支护结构稳定性安全系数和支护结构水平位移之间的关系表达式,更加符合理论与工程实际;(4)现行桩锚支护结构设计偏于保守,考虑预应力的基坑稳定性和位移计算方法,仍需根据大量工程实践进行验证与修正。(5)首次考虑附加应力作用的桩锚支护结构稳定性计算与水平位移关系研究,可为基坑开挖过程中的动态稳定性评价提供理论依据。

关键词: 支护结构, 预应力, 附加应力, 水平位移, 稳定性

Abstract: The pile anchors are used widely as supporting structure. But in excavation, the stability of foundation with the prestressed anchors and displacement hasn't been solved yet. Additional stress caused by prestressed anchors influences on the stability and displacement of foundation, the expression between prestress and the stability of the pile anchor supporting structure, and the equation of horizontal displacement and structure stability are formulated. In a typical foundation pit, comparisons of the calculation results by general design software show that: 1) The prestress is considered as additional stress to calculate the overall stability safety factor of foundation pit, and the safety factor increases with increasing prestess; there exists a non-linear relationship between the safety factor and prestess; 2) Similarly, the displacement of the pile anchor supporting structure can be calculated by the forementioned way; and horizontal displacement of retaining structure decreases as prestress increases, which presents a non-linear relationship; 3) The expression of relationship between the stability safety coefficient of supporting structure and the horizontal displacement of retaining structure is given, which is more suitable for theory and engineering practice; 4) Compared with the calculation method for stability and displacement of the foundation pit considering prestress, the existing design of the pile anchor supporting structure is conservative and still needs to be validated and corrected according to a large number of engineering practices. 5) We first study the relationship of stability of pile anchor supporting structure and horizontal displacement considering additional stress, which can provide theoretical foundation for dynamic stability evaluation of foundation pit in the process of excavation.

Key words: retaining structure, prestress, additional stress, horizontal displacement, stability

中图分类号: 

  • TU 476

[1] 赵久彬, 刘元雪, 何少其, 杨骏堂, 柏准, . 三峡库区阶跃变形滑坡水平位移与降雨量 数学统计模型[J]. 岩土力学, 2020, 41(S1): 305-311.
[2] 童星, 袁静, 姜叶翔, 刘兴旺, 李瑛, . 基于Mindlin解的基坑分层卸荷附加应力计算 及回弹变形的多因素影响分析[J]. 岩土力学, 2020, 41(7): 2432-2440.
[3] 杜文杰, 盛谦, 付晓东, 汤华, 陈贺, 杜宇翔, 周永强, . 地震作用下岩羊村滑坡稳定性与失稳机制研究[J]. 岩土力学, 2020, 41(7): 2461-2469.
[4] 毛浩宇, 徐奴文, 李彪, 樊义林, 吴家耀, 孟国涛, . 基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析[J]. 岩土力学, 2020, 41(7): 2470-2484.
[5] 肖世国, 刘航, 于昕左. 水平柔性拉筋式重力墙−坡体地震整体 稳定性分析方法[J]. 岩土力学, 2020, 41(6): 1836-1844.
[6] 徐毅青, 邓绍玉, 葛琦. 锚索预应力初期与长期损失的预测模型研究[J]. 岩土力学, 2020, 41(5): 1663-1669.
[7] 肖明清, 徐晨, . 基于临界稳定断面的隧道围岩稳定性分析方法探讨[J]. 岩土力学, 2020, 41(5): 1690-1698.
[8] 朱彦鹏, 严紫豪, 朱轶凡. 微型钢管砂浆复合桩在土体中稳定性计算[J]. 岩土力学, 2020, 41(4): 1339-1346.
[9] 郎瑞卿, 杨爱武, 闫澍旺, . 修正等应变假定下刚性桩复合地基固结特性分析[J]. 岩土力学, 2020, 41(3): 813-822.
[10] 米博, 项彦勇, . 砂土地层浅埋盾构隧道开挖渗流稳定性的 模型试验和计算研究[J]. 岩土力学, 2020, 41(3): 837-848.
[11] 毕宗琦, 宫全美, 周顺华, 程茜, . 循环荷载下竖向土拱演化规律试验研究[J]. 岩土力学, 2020, 41(3): 886-894.
[12] 史振宁, 戚双星, 付宏渊, 曾铃, 何忠明, 方睿敏, . 降雨入渗条件下土质边坡含水率分 布与浅层稳定性研究[J]. 岩土力学, 2020, 41(3): 980-988.
[13] 刘一扬, 宋选民, 朱德福, 李竹. 大块度关键块动态结构力学行为及响应特征研究[J]. 岩土力学, 2020, 41(3): 1019-1028.
[14] 苏永华, 李诚诚. 强降雨下基于Green-Ampt模型的边坡稳定性分析[J]. 岩土力学, 2020, 41(2): 389-398.
[15] 朱彦鹏, 陶钧, 杨校辉, 彭俊国, 吴强, . 框架预应力锚托板结构加固高填方边坡 设计与数值分析[J]. 岩土力学, 2020, 41(2): 612-623.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!