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| Analysis of Stress Concentration of a Little Spacing Shallow and Subsurface Excavated Tunnel |
| YANG Hui-jun, LIU Hong-yang |
| China Railway Tunnel Group Co.Ltd, Luoyang, Henan 471009, China |
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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.
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Received: 16 October 2009
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2010, Vol. 27 
