), 廖晨聪1(), 王建华1, 李耀良2 1.上海交通大学土木工程系，上海 200240
2.上海市基础工程集团有限公司，上海 200002
收稿日期:2017-05-23出版日期:2018-11-01发布日期:2021-06-04通讯作者:廖晨聪E-mail:1104827221@sjtu.edu.cn;billaday@sjtu.edu.cn作者简介:马合龙（1992-)，男，河南省新乡市人，硕士生，研究方向为顶管及隧道工程．E-mail: 基金资助:国家自然科学基金重点项目(41330633);国家自然科学基金面上项目(51678360);国家自然科学基金青年项目(41602282)Field Test of Mechanical Properties of Large Diameter Steel Jacking Pipe Under Construction and Temperature Load in Soft Soil
MA Helong1(), LIAO Chencong1(), WANG Jianhua1, LI Yaoliang2 1.Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2.Shanghai Foundation Engineering Group Company, Shanghai 200002, China
Received:2017-05-23Online:2018-11-01Published:2021-06-04Contact:LIAO Chencong E-mail:1104827221@sjtu.edu.cn;billaday@sjtu.edu.cn摘要/Abstract
摘要： 为了研究钢顶管在施工及运营阶段的内力特征，采用现场测试的方法，依托黄浦江上游水源地连通工程，对深覆软土、长距离顶进、内径4 m的钢顶管在施工荷载和温差作用下的环向、纵向应变进行监测．分析实测结果表明：管道固定截面随顶进距离增加受力状态改变较小，不同截面中靠近机头处受到顶力的影响较小；纵向应力主要受顶力影响，以受压为主，环向应力主要受到管道埋深影响，深覆软土情况下，管道顶部环向可能出现拉应力，左右受压为主；纵向和环向应力之间相互影响，埋深较大时影响较为明显，长距离顶进下顶进偏心对管道应力有较大影响；顶力的施加会使纵向应力产生较大波动，顶力撤除应力恢复平稳；大直径钢材管道在温差6℃时，温度应力达25 MPa左右，环向、纵向区别较小，不影响正常运营，但仍需谨防极端温差下可能造成的破坏．
关键词: 大直径钢顶管, 受力特性, 现场监测, 施工应力, 温度应力
Abstract: Circumferential and longitudinal strain of steel jacking pipe which is buried in deep soft soil and jacked with long distance was monitored on the spot to study internal force of pipe under construction and temperature load. The results show that internal force of a fixed section changes little due to jacking distance. For different sections, the one that is closer to the jacking machine head is affected less by jacking force. Compressive stress predominates in longitudinal direction, and is mainly affected by jacking force. However, circumferential stress is mainly due to buried depth, and maybe tensile with deep buried on top of pipe. Circumferential stress and longitudinal stress are coupling especially with large buried depth. Eccentricity of jacking force has a great effect on internal force of pipe. When jacking force is applied, longitudinal stress changes by a large margin, and returns to steady after jacking force removed. The stress in pipe can reach 25 MPa caused by 6 ℃ temperature difference, which hardly influences the using of the pipe. There is little distinction between longitudinal stress and circumferential stress. However, extreme range of temperature should be valued, and may cause destroying.
Key words: large diameter steel jacking-pipe, mechanical properties, site monitoring, construction stress, temperature stress
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