摘要
目前,曲线顶管技术在地下工程建设中的应用越来越广泛。但曲线顶管因管节之间存在偏角使得应力分布不均,其受力特性和应力传递路径与传统直线顶管存在显著差异。以拱北隧道曲线顶管管幕工程为依托,采用室内顶管受力模拟试验系统,对曲线钢顶管匀速顶进过程进行了模拟试验,研究了管节接头应力特征、顶进力传递路径及其与顶推力大小、造斜角度之间的关系。试验结果表明:曲线顶管中,管节两端接头出现应力集中,形成一条明显的顶力传递路径,且应力集中会随着顶力和造斜角度增大而加剧;在垫片被压紧处应力传递路径更显著。
Currently,the curved pipe jacking technique has been widely applied to construct underground projects.However,the deflection angle of curved pipe jacking makes stress distribution asymmetrical,and force characteristics and stress path are different from that of traditional straight pipe jacking greatly.Because of the reinforcement structure of pipe joint and the special construction method,it is urgently required to study strain characteristics of pipe during pipe jacking deeper.Based on the curved pipe roof of Gongbei Tunnel project,a curved steel pipe jacking experiment was conducted with constant speed by laboratory pipe jacking mechanics simulation test system.The pipe stress characteristics,jacking force transfer path and relationship with jacking force and deflection angle were studied.The results show that stress concentration occurred at pipe joint on both sides of pipe.An obvious force transfer path is formed.Besides,this concentration would increase the jacking force and deflection angle enlarging.The stress path is prominent at the location where gaskets are extruded.
出处
《地质科技情报》
CAS
CSCD
北大核心
2016年第2期79-82,共4页
Geological Science and Technology Information
基金
港珠澳大桥珠海连接线拱北隧道暗挖段管幕工程科研项目"复杂条件下长距离大直径曲线顶管及管幕施工关键技术研究"
关键词
曲线顶管
钢管节
受力特性
室内模拟试验
curved pipe jacking
steel pipe
mechanical characteristics
laboratory simulation test
