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| Study and Application of Safety Grade of Surrounding Rock Deformation in Construction of Railway Tunnel |
| ZHANG Min-qing1,HUANG Hong-jian2,WU Chuan1 |
1.Engineering Management Center, China Railway Corporation, Beijing 100844, China;
2. Chengdu-Guiyang Railway Limited Liability Company, Chengdu,Sichuan 610031, China |
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Abstract Research purposes:There are more than 4000 railway tunnels under construction which are about 8 000 km in China.In recent years the tunnel collapse accident occasionally occurred, causing casualties, economic losses and social influence of certain. Establishing the safety grade of railway tunnel surrounding rock deformation is very important for site management. On the basis of research results at home and abroad, this paper analyzed safety monitoring data, which is supplemented by theoretical calculation and based on the safety of initial support, formulated the railway tunnel deformation control safety management numerical value.
Research conclusions:(1) The current safety grade management of railway tunnel surrounding rock deformation can not integrate with the international standards. (2) By using standard design parameters and numerical simulation computation, vault settlement after excavation supporting of surrounding rock grade Ⅳ tunnel is 11 mm, the surrounding rock grade V tunnel is 19 mm, and field measurement is far larger than the value. Therefore, the deformation of tunnel surrounding rock is mainly controlled by the excavation method, the initial supporting construction quality, and the initial support closed timeliness. (3) The management of early warning level 2 and warning level 1 is carried out according to the total deformation and deformation rate of tunnel surrounding rock deformation, total deformations of grade Ⅲ are 40 mm and 80 mm respectively, grade IV are 50 mm and 100mm,grade V and VI are 75 mm and 150 mm, deformation rate are 5 mm/d and 10 mm/d. (4) The research results can be used for railway tunnel surrounding rock deformation monitoring and safety management.
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Received: 17 June 2014
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2014, Vol. 31 
