2006, Volume 8, Issue 12
Strategic Study of CAE >> 2006, Volume 8, Issue 12
Shield Driven Tunneling in the Complex Layer：Direction Control of Shield and Preventing Segment Crack
1. Beijing Jiaotong University, Beijing 100044, China
2. China Railway Tunnel Group, Luoyang, Henan 471009, China
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Abstract
The ground layer of the No.2 Metro Line in Guangzhou has the characteristics of mixed ground conditions： more curves and big gradient variation. So it is difficult to excavate successfully and control the tunneling direction and shield tunneling attitude. Furthermore, it is also difficult to prevent segment crack and local failure and dislocation of segment. In order to control the tunneling direction and shield tunneling attitude more successfully, the reason of direction warp was studied and the actual measure data of Yue-San shield tunneling zone were analyzed. At last, the reason and the rule of direction warp were got and many methods to control shield tunneling attitude were tried. The main cause of segment crack and local failure of segment, were also studied with numerical simulation, and methods to control segment crack were brought forward.
Keywords
mixed ground ; tunnel ; attitude control ; segment crack ; segment dislocation
Figures
图1三—火区间隧道掘进方向偏差统计
图2火—越区间隧道掘进方向偏差统计
图3激光指向与测量
图4VMT导向显示平台
图5管片接缝处的裂缝
图6管片开裂和破损的主要原因示意图
图7施工过程盾构管片等效拉应力分布
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