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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2018, Vol. 37 ›› Issue (03): 51-57.DOI: 10.3969/j.issn.1674-0696.2018.03.10

• 港口航道·水利水电·资源环境 • 上一篇    下一篇

相邻基坑对拉锚索支护结构参数敏感性分析

吴曙光1,2，韩培宇3，宋康1,2，彭朋4   

  1. (1.山地城镇建设与新技术教育部重点实验室(重庆大学)，重庆 400045； 2.重庆大学 土木工程学院, 重庆 400045； 3.苏州高新景枫投资发展有限公司，江苏 苏州 215010； 4. 长江勘测规划设计研究有限责任公司，湖北 武汉430010)
  • 收稿日期:2016-07-07 修回日期:2016-11-23 出版日期:2018-03-20 发布日期:2018-03-26
  • 作者简介:吴曙光(1975—)，男，浙江金华人，副教授，博士，主要从事岩土工程方面的研究。E-mail：wsg1975@163.com。 通信作者：韩培宇(1992—)，男，江苏连云港人，硕士，主要从事岩土工程方面的研究。E-mail：1223041984@qq.com。
  • 基金资助:
    中央高校基本科研业务费项目(106112015CDJXY200006)；国家“十二五”科技支撑计划项目(2012BAJ22806-04)

Parameter Sensitivity Analysis on Pulling Anchorage Supporting Structure in Neighboring Foundation Pits

WU Shuguang1,2, HAN Peiyu3, SONG Kang1,2, PENG Peng4   

  1. (1.MOE Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, P. R. China; 2.School of Civil Engineering, Chongqing University, Chongqing 400045, P. R. China; 3.Suzhou High-Tech Kingfine Investment & Development Co. Ltd., Suzhou 215010, Jiangsu, P. R. China; 4.Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, Hubei, P. R. China)
  • Received:2016-07-07 Revised:2016-11-23 Online:2018-03-20 Published:2018-03-26

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摘要： 利用软件FLAC3D进行参数的敏感性分析，考虑锚索竖向间距、桩直径、相邻基坑间距、锚索预应力、桩间距、桩嵌固长度6个因素对对拉锚索支护 结构性能的影响，具体为桩身弯矩、锚索轴力、桩后土体位移3个方面。分析结果表明：预应力锚索的设置使桩身弯矩局部呈“波浪形”但随着桩直径的 增大，桩身弯矩呈现出“波浪形”的这一特点逐渐变弱；桩的有效抗弯长度随着桩径的增大而变长；可以通过增大预应力的方式，显著减小桩身的控制弯 矩，从而减少桩的配筋，有效地节约工程造价；桩身弯矩沿桩深整体呈“S形”，且控制弯矩都位于嵌固段；当嵌固长度满足一定深度后，嵌固长度变化 对桩身弯矩、预应力锚索轴力、桩后土体位移没有影响。

关键词: 岩土工程, 对拉锚索, 参数敏感性分析, FLAC3D

Abstract: The sensitivity analysis of parameters was carried out by FLAC3D software, considering the influence of 6 factors such as the cable vertical spacing, pile diameter, spacing of neighboring foundation pits, anchorage prestress, pile spacing and pile embedding fixation length on the cable supporting structure performance, specifically for 3 aspects such as the bending moment of the pile body, the axial force of the anchorage cable and the displacement of the soil after the pile. The analysis results show that: the bending moment of the pile looks like a wave locally because of the setting of the prestressed anchor cable, however, this characteristic of the bending moment of the pile is gradually weakening with the increase of the pile diameter. The effective bending length of pile becomes longer with the increase of pile diameter. By increasing the prestress, the control bending moment of the pile can be reduced significantly, and thus the reinforcement of the pile can be reduced and the cost of the project can be saved effectively. The bending moment along the pile looks like the letter S in the whole, and the control bending moment is located in the embedded section. When the embedded length meets a certain depth, the change of the embedded length has no effect on the bending moment of the pile, the axial force of the prestressed anchor cable and the soil displacement after the pile.

Key words: geotechnical engineering, pulling anchorage, parameter sensitivity analysis, FLAC3D

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