地铁小竖井转横通道施工大跨隧道数值模拟分析  

Numerical Simulation Analysis of Large-Span Tunnel Construction through Cross Aisle from Subway Small Shaft

作　　者：白铭海 吉小明[1] 

机构地区：[1]广东工业大学土木与交通工程学院,广州510006

出　　处：《地下空间与工程学报》2015年第2期469-476,共8页Chinese Journal of Underground Space and Engineering

摘　　要：狭小场地施工大跨暗挖隧道是城市地铁建设中的常见问题,而小竖井施工浅埋暗挖大跨隧道的安全控制是狭小场地修建城市地铁的关键技术,在施工时容易发生横通道坍塌或引起地表过大沉降及周围建筑的破坏。本文以广州市轨道交通五、六号线换乘站区庄站南端浅埋暗挖大跨隧道施工为背景,介绍竖井横通道内利用桩梁体系转向施工及狭小场地施工地铁浅埋暗挖大跨隧道的关键技术。利用大型有限元分析软件ABAQUS对超前小导管、超前管棚等预加固措施进行论证,并对小竖井施工大跨隧道过程进行三维数值分析。计算结果表明:开挖到横通道顶标高后在竖井四个角增设一榀竖向格栅,加固横通道马头门、采用超前小导管对通道进行预支护,有效地保证了支护结构安全和隧道围岩稳定;在竖井转入横通道后采用桩梁体系成功地解决了因上部荷载过大引起的横通道稳定问题,并有效地控制了地表沉降。The construction of large-span tunnel in narrow site is the common problem in building urban metro, and the safety control of shallow excavation of large-span tunnel from small shaft is the key technology in this structure. There may be collapse or excessive subsiding occurred. This paper based on the shallow excavation of large-span tunnel in construction of the south Ouzhuang interchange of GuangZhou rail traffic line 5 and line 6 deeply illustrates the key technology about transformation of the construction using pile-beam system and the construction of shallow large-span tunnel excavation in narrow site. This thesis also demonstrates the consolidation measure utilizing advanced ductule grouting and forepoling pipe-shed by large finite element analysis Software ABAQUS, then the process of large-span tunnel construction from small shaft is analyzed by three-dimension finite element method. The results show that adopting pre-reinforcement measure on ingate can ensure the security of construction and the stationary of tunnel surrounding rock. The pile-beam system solves the stabilization problems of cross aisle causing by upper loads successfully, and control the surface subsidence effectively.

关 键 词：小竖井 大跨隧道 马头门 施工安全控制 

分 类 号：U453.4[建筑科学—桥梁与隧道工程]