摘要
伴随着地铁盾构技术的不断发展,类矩形地铁盾构逐渐进入人们的视线。盾构隧道施工荷载对隧道结构有不容忽视的影响,文章以宁波类矩形盾构隧道为依托,开展了施工荷载作用下的衬砌结构受力现场试验研究,探讨了施工阶段同步注浆对衬砌结构受力的影响。研究表明:注浆压力的影响区域主要集中在盾尾后面三环的距离;施工期的注浆作用会使衬砌结构受力整体大于稳定后的结构受力,且会引起荷载的不对称分布;注浆压力的实测影响范围大于设计模型中的作用范围。
With the development of subway shield technology, the quasi-rectangular shield tunnel is gradually coming to prominence. Since the effect of construction loads on the shield tunnel＇s structure cannot be ignored, a field experiment regarding a lining＇s structural behavior under the construction load was carried out to evaluate the mechanical effect of simultaneous grouting on the structural behavior of the lining, using the quasi-rectangular shield tunnel in Ningbo as an engineering model. Studies show that the area affected by grouting pressures is gener- ally concentrated in a location approximately three segment rings away from the shield tail. Because of the grouting effect, the load on the lining structure during construction is higher than that in the final state, and the load distribu- tion trends to be asymmetrical and the measured grouting pressure affected area is larger than shown by the design model.
出处
《现代隧道技术》
EI
CSCD
北大核心
2016年第6期174-181,共8页
Modern Tunnelling Technology
基金
国家自然科学基金资助项目(51578409)
关键词
类矩形盾构
现场试验
施工荷载
注浆压力
Quasi-Rectangular shield
Field experiment
Construction load
Grouting pressure
