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浙江大学学报(工学版)
浙江大学学报(工学版)  2017, Vol. 51 Issue (8): 1475-1481    DOI: 10.3785/j.issn.1008-973X.2017.08.001
土木与交通工程     
坑底加固控制地铁基坑开挖引起土体位移的现场测试与分析
李卓峰1, 林伟岸1, 朱瑶宏2, 边学成1, 叶俊能2, 高飞1, 陈云敏1
1. 浙江大学 软弱土与环境土工教育部重点实验室, 浙江 杭州 310058;
2. 宁波市轨道交通工程建设指挥部, 浙江 宁波 315012
Field test and analysis of controlling metro excavations deformation by foundation reinforcement
LI Zhuo-feng1, LIN Wei-an1, ZHU Yao-hong2, BIAN Xue-cheng1, YE Jun-neng2, GAO Fei1, CHEN Yun-min1
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
2. Ningbo Rail Transit Project Construction Headquarters, Ningbo 315012, China
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摘要：

为了研究地铁基坑坑底加固对周边土体位移的影响，通过某软土地基地铁基坑南北测试段的水泥搅拌桩加固效果进行静力触探测试获得加固前、后锥尖阻力，计算得到南北测试段加固后土体无侧限抗压强度分别为0.58和1.17 MPa.对南北测试段表面沉降和地连墙水平位移进行实测，得到南北测试段地连墙最大水平位移分别为81.3、48.3 mm，地表沉降最大值分别为-79.1、-40.2 mm.建立Plaxis有限元计算模型，分析不同坑底加固效果工况下基坑开挖变形情况，模拟结果与实测结果基本一致.分析结果表明，南北测试段坑底加固后地连墙最大水平位移分别降低40%和64%，地表沉降分别降低26%和63%，地基加固能够有效地减小地铁基坑围护结构水平变形和地表沉降.
Abstract:

The values of soil cone resistance were obtained by cone penetration tests before and after the foundation reinforcement in order to analyze the influence of foundation reinforcement on soil deformation surrounding metro excavation. The unconfined compressive strengths of soil reinforced in the south and north test sections were 0.58 MPa and 1.17 MPa respectively. The lateral wall deflections and the ground settlements were measured. The maximum lateral wall deflections in the south and north test sections were 81.3 mm and 48.3 mm respectively. The maximum ground settlements were -79.1 mm and -40.2 mm respectively. The finite element models were established by Plaxis, which parameters used results of field tests. The simulation results accorded with the measured results. The analysis results showed that the maximum lateral wall deflections were reduced by 40% and 64% respectively, after being reinforced in the south and north test sections. The maximum ground settlements were decreased by 26% and 63% respectively. Foundation reinforcement can effectively reduce the lateral wall deflections and the ground settlements of metro excavations.
收稿日期: 2016-12-05 出版日期: 2017-08-16
CLC:  TU472  
基金资助:

国家自然科学基金资助项目（51678524，51478434）；宁波市社会发展科技攻关资助项目（2014C50036）.
通讯作者: 林伟岸,男,副高级工程师.ORCID:0000-0002-3864-451X.     E-mail: linweian@zju.edu.cn
作者简介: 李卓峰(1992-),男,博士生,从事结构性软土性能、地铁设计与施工等研究.ORCID:0000-0003-1026-642X.E-mail:lizhfg@126.com
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引用本文:

李卓峰, 林伟岸, 朱瑶宏, 边学成, 叶俊能, 高飞, 陈云敏. 坑底加固控制地铁基坑开挖引起土体位移的现场测试与分析[J]. 浙江大学学报(工学版), 2017, 51(8): 1475-1481.

LI Zhuo-feng, LIN Wei-an, ZHU Yao-hong, BIAN Xue-cheng, YE Jun-neng, GAO Fei, CHEN Yun-min. Field test and analysis of controlling metro excavations deformation by foundation reinforcement. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(8): 1475-1481.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2017.08.001    或    http://www.zjujournals.com/eng/CN/Y2017/V51/I8/1475

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