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Rock Damage Strength Theory and Its Application in Tunnel Design and Construction |
JIANG Su1, GAN Kun-rong1, LIYuan-hai2 |
1. China Railway Tunnel Group Co. Ltd, Luoyang, Henan 471009, China; 2. China University of Mining and Technology, Xuzhou, Jiangsu 221008, China |
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Abstract Research purposes:This paper introduces the wall rock damage strength theory and the problems in application, discusses the current possibility of the theory being applied in tunnel design and construction, analyzes the formation mechanism of the load arch and its impact factors, and explores the way to improve the bearing capacity of surrounding rock.
Research conclusions:(1)The research results and methods of rock damage strength theory may guide the tunnel design and construction, and can be applied in the design concept at macro-level. (2) Improvement of the stress state is helpful for enhancing the bearing capacity of surrounding rock. (3)The bearing capacity of surrounding rock relates to the time function and can be controlled by taking engineering measures. (4)In shallow stratum, the tunnel design load depends on the stress state and damage range of the rock around the tunnel. (5)More attention should be paid to the negative effect of taking the engineering measure on the bearing capacity of surrounding rock while the positive effect is given full play. (6)It is necessary to do the researches on the energy dissipation and release system and the technology for the survey in advance.
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Received: 09 October 2008
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