Key Points for the Breaking-through of Large-profile Railway Tunnels in Soft Rocks
(1 Project Management Department of Lanzhou-Chongqing Railway, China Railway No.19 Construction Bureau Group, Dingxi 743001; 2 Lanzhou-Chongqing Railway Co., Ltd., Lanzhou 730050)
Abstract：
Error prediction and adjustment as well as reasonable construction option and organization will be concerned with before and after tunnel breaking through. In addition, it is very complex for the structure at the tunnel breaking-through section. Especially in soft rocks, it is very often to have large convergences and deformations and cracking in primary support before and after the breaking-through of tunnel, liable to result in collapse. The key points of construction before and after the tunnel breaking-through are presented in the paper by taking the construction of tunnel group at Lot I of Lanzhou-Chongqing railway as the background.
JIE Fang-Liang-1,
Hu-Suo-Bin-2,
Zhang-Bao-Yong-1
.Key Points for the Breaking-through of Large-profile Railway Tunnels in Soft Rocks[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(2): 161-163
2011, Vol. 48 