软土地层大直径钢筋混凝土顶管上浮失稳研究
Research on uplift stability failure of large diameter reinforced concrete pipe jacking in soft soil stratum
崔旭辉 1陈春林 1杨钊 1周洋 1杨睿1
作者信息
- 1. 中交第二航务工程局有限公司,武汉 430040
- 折叠
摘要
软土地层是顶管施工中较难处理的一类地层,由于土体强度低、压缩量大,易发生管节失稳事故.为研究软土地层大直径钢筋混凝土顶管在失稳发展过程中的受力特性,依托武汉汤逊湖污水处理尾水排江穿湖段顶管工程,对管节轴向应变进行了现场监测.研究了测试管节在穿越上浮失稳区域时的受力情况,分析了管节上浮失稳机理.提出了一种管节上浮失稳判定方法,并对现场所采取的上浮失稳处理措施进行了总结.结果表明:在软土地层中,顶进力、注浆压力、浮力和管节偏转角是引起管节上浮失稳的主要因素.当局部管节上浮时,管节底部将出现应力集中,且随着顶进的进行,上浮量和上浮区域逐渐增加.
Abstract
Soft soil stratum is a kind of stratum that is difficult to deal with in pipe jacking construction.Because of low strength and large compression of the soil,it is easy to cause the stability failure of pipe.In order to study the mechanical characteristics of large diameter reinforced concrete pipe jacking in soft soil stratum during the development of pipe stability failure,based on the sewage pipe jacking project crossing Tangxun Lake in Wuhan,the axial strain of the pipe was monitored on-site,the force conditions of the test pipes when crossing the uplift stability failure area were studied,and the mechanism of the uplift stability failure of the pipes was analyzed.A method was proposed to determine the uplift stability failure of pipe.In addition,the treatment measures for uplift stability failure taken on site were summarized.The results show that the jacking force,grouting pressure,buoyancy force and pipe deflection angle are the main factors causing uplift stability failure in soft soil stratum.When the local pipes are uplifted,the stress concentration will appear at the bottom of the pipe,and the uplift value and the uplift area gradually increase as the jacking progresses.
关键词
软土地层/大直径钢筋混凝土顶管/管节失稳/受力特性Key words
soft soil stratum/large diameter reinforced concrete pipe jacking/stability failure of pipe/mechanical characteristics引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据