Π形地下连续墙盾构始发施工关键技术研究

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• 英文论文题名：Key technologies in applications of Π-shaped diaphragm wall in shield launching
• 论文作者：胡俊 ; 张翔 ; 刘勇 ; 张正旋
• 英文论文作者：Hu Jun ; Zhang Xiang ; Liu Yong ; Zhang Zhengxuan ; College of Civil Engineering and Architecture ; Hainan University ; Department of Civil & Environmental Engineering ; National University of Singapore
• 年：2016
• 作者机构：海南大学土木建筑工程学院;新加坡国立大学土木与环境工程系;
• 论文关键词：Π形地下连续墙 ; 盾构进出洞 ; 端头加固 ; 数值模拟
• 英文论文关键词：Π-shaped diaphragm wall ; shield break-in/out ; end shaft reinforcement ; numerical simulation
• 会议召开时间：2016-09-26
• 会议录名称：中国土木工程学会2016年学术年会论文集
• 语种：中文
• 分类号：TU753
• 学会代码：OGTY
• 会议名称：中国土木工程学会2016年学术年会
• 会议地点：中国北京
• 主办单位：中国土木工程学会
• 学会名称：中国土木工程学会
• 页数：17
• 文件大小：3234k
• 原文格式：O
• 会议级别：全国

摘要

盾构进出洞存在着很大的施工风险,如何选择合理的盾构进出洞施工方法是目前亟待解决的关键问题。本文基于发明专利《一种Π形地下连续墙盾构进出洞施工方法(ZL201410547255.X)》,对该新型工法展开研究,运用Midas/gts有限元软件,在Π形地连墙合理翼墙长度下对盾构始发掘进的5种工况进行了数值分析,主要得出:采用Π形地连续墙作为始发井洞门处围护结构,再结合直接切削洞门的施工方法,能够明显抑制洞门破除后暴露土体向始发井的位移;翼墙长度越长,危险工况下端头土体位移越小,但地连墙上最大拉、压应力会越大,且地连墙和土体的受拉区范围会沿着翼墙扩展,合理的翼墙长度约为6m;6m翼墙长度下5种工况的数值模拟表明Π形地连墙上的最大拉应力出现在两片翼墙与端墙连接处顶端,最大压应力出现在翼墙底部外角点处,最大拉、压应力均小于强度设计值且有一定的强度储备,该工法是可行的。所得结果可为今后类似工程设计提供技术参考依据。
During the process of shield's break-in and break-out of a tunnel,it is an important technology issue that how to reasonably select the construction scheme of the break in and break out.This study is based on the patent entitled "A construction technology of using the Π-shaped diaphragm wall in shield launching(Grant No.:ZL201410547255.X)".The technology proposed in the patent is discussed in this study.By using the software Midas/gts,numerical analysis was conducted on five scenarios of using the Π-shaped diaphragm wall in shield launching.It is found that by using the Π-shaped diaphragm wall as the supporting structure during the shield launching,together with the direct cutting(tunnel portal) technique,the displacement of soils(resulting from the cutting) towards the ending shaft can be significantly reduced.The longer the length of the wing wall,the smaller settlement of the soils at the dangerous conditions is;however,the maximum tensile and compressive strengths become greater.The diaphragm wall and surrounding soils have the tendency to extent along the wing.A reasonable length of the wing is 6 m.The numerical simulations of five scenarios of the Π-shaped diaphragm wall(with wings being shorter than 6 m)show that the maximum tensile strength occurs at the joint point of two wings and the diaphragm wall,while the maximum compressive strength occurs at the outside corner of the diaphragm wall.Some safety margin can be observed in the maximum tensile and compressive strengths,which indicates the feasibility of the proposed technology.The results in the study may serve as a reference case for comparable grounds/projects.

引文

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