|
|
|
| Design Technology for Super Large Cross Section Tunnel in Stratum of Completely Weathered Granite with Abundant Water |
| GONG Yan - feng1 ,ZHANG Jun - ru2,XU Xiang - dong1 ,TANG Zhao1 |
| (1. Hubei Provincial Engineering Laboratory for Underwater Tunnel，China Railway Siyuan Survey and Design Institute Group Co. Ltd，Wuhan， Hubei 430063， China; 2. Key Laboratory of Transportation Tunnel Engineering， Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
|
|
|
|
Abstract Research purposes ： In the dangerous difficult mountainous area，affected by the railway station setting and the contact line fork， there will be multi - line station tunnel and variable section tunnels， even form a super large section tunnel. When the shallow tunnel is located in stratum of completely weathered granite with abundant water， tunnel construction has the following security risks ： the topographic and geological conditions are poor， developed groundwater， easy to collapse; Primary support force are large， deformation control is difficult， exit the risk of deformation intrude structure ambit，lose stability and collapse; Tunnel should be taken repeatedly excavation support， difficult force transfer， high security risk of support remove and replace. In view of the domestic and foreign less examples and research on super large cross section shallow tunnel in stratum of completely weathered granite with abundant water，there are less research on it. Based on the practical engineering，the problem is studied in this paper.
Research conclusions ： This paper summarizes the domestic and foreignnowadays construction technology of super large section tunnel， analyzes the mechanical behavior of tunnel constructive process， establishes measures of advanced support，support parameters of lining and constructive methods，the main conclusions are as follows ： (1) The construction of super large section tunnel in stratum of completely weathered granite with abundant water is difficult，high security risk and high cost， should be combined with specific conditions of tunnel engineering to develop practical supporting measures and construction methods. (2) To control primary support deformation and primary supporting measures conversion of super large section tunnel in stratum of completely weathered granite with abundant water， large wall foundation and multiple supporting measures are necessary* (3 ) In order to control deformation of soft stratum with abundant water， deformation and collapse of super large cross section tunnel， should adopt strong advanced reinforcement and reinforcement measures of tunnel face* (4) The relevant research results can provide reference for the design and construction of the super large section tunnel in soft stratum.
|
|
Received: 22 July 2015
|
|
|
|
|
|
|
2015, Vol. 32 
