Abstract：Research purposes：In the course of subsurface excavation of a little spacing tunnel, the stress concentration of the soil mass between adjacent pilot tunnels influences the safety of the soil mass between two tunnels, the construction of the subsequent tunnel and the previous tunnel, even damages the surrounding buildings and underground pipe line. Therefore, analysis of the stress concentration of a little spacing shallow and subsurface excavated tunnel is very important to ensure the construction security.
Research conclusions：In the paper, combined with the subsurface excavation of a little spacing group tunnels at Xuanwumen Station, the stress concentration is analyzed on the basis of monitored and measured data, the stress strain effects of the soil mass between two tunnels during the construction of a little spacing tunnel is quantified, and the settlement regulation of the soilmass and the change characteristics of soil pressure are also analyzed. The results show (1) The settlement at the center of soilmass between two tunnels is up to-14. 8mm, being 1.1~2 times of other areas. The relation between soil settlement and soil pressure is identical with the theoretical analysis. This shows the obvious stress concentration happens at this place. (2) The subsequent tunnel slightly affects the previous tunnel in tension. At the same time, according to the distance between working face and monitoring site, the stages of earth settlement and earth pressure are divided to provide the basis for taking measures for reducing the stress concentration.
杨会军；刘虹阳. 浅埋暗挖小净距隧道应力集中现象分析[J]. 铁道工程学报, 2010, 27(1): 42-46.
YANG Hui-jun, LIU Hong-yang. Analysis of Stress Concentration of a Little Spacing Shallow and Subsurface Excavated Tunnel. 铁道工程学报, 2010, 27(1): 42-46.
[ 1 ] Sterp,i D., C ividin,i A. A physical and numerical investigation on the stability of shallow tunnels in strain softening media[J]. Rock Mechanics and Rock Engineering, 2004(4):277-298.
[ 2 ] Gandhe, A., Venkatesw arlu, V., and Gupta, R.N. ,Extraction of coal under a surface water body-a strata control investigation[J]. Rock Mechanics and Rock Engineering, 2005(5):399-410.
[ 3 ] 王梦恕. 地下工程浅埋暗挖技术通论[M]. 合肥:安徽教育出版社, 2005.
Wang Mengshu. Construction Method of Undercutting under Shallow Overburden for Underground Works[M]. Hefei: Anhui Education Press, 2005.
Li Panfeng. Engineering Geological Study on the Stability of Rock Mass Surrounding Large Scale Underground Caverns-taking the Underground Caverns of Laxiwa Hydroelectric Power Station on Yellow River as an example[D]. Chengdu: Chengdu University of Technology, 2004.
Hu Bin. Dynam ic Numerical Simulation Analysis on the Surrounding Rock Mass Stability of the Huge Underground Cavities in a Deep Cutting Gorge[D]. Chengdu: Chengdu University of Technology, 2001.
[ 6 ] 徐志英. 岩石力学[M]. 北京:水利水电出版社, 1993.
Xu Zhiying. Rock Mechanics [M]. Beijing: Water Power Press, 1993.
Yang Huijun, et al. The Construction Technology Research of Large-span Underground Excavation Under Shallow Cover Method Building Metro Station under the Running Metro Station with Extremely Near Distance[R]. Luoyang: China Railway Tunnel Group Co., Ltd, 2008.
Wang Mingnian, Li Zhiye, Guan Baoshu. Research on Controlling Measures for Ground Surface Settlement of Three Little Distance Parallel Shallow Embedded Tunnels[J]. Rock and Soil Mechanics, 2002(6): 821-824.
Wang Nuantang, Chen Ruiyang, Xie Jing. Study on Construction Technique of Multi-tunneling at Shallow Depth of Urban Subways[J]. Rock and Soil Mechanics, 2002(2): 208-212.
2010, Vol. 27 
版权所有 © 2014 《铁道工程学报》编辑部