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| RESEARCH ANALYSIS OF EXCAVATION-INDUCED RELAXATION OF ROCK FOUNDATION AND EVALUATION OF ANCHOR EFFECT |
| ZHANG Shihu1，2，FU Shaojun1，2，CHEN Shenghong1 |
| (1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. School of Civil and Architectural Engineering，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract Aiming at specific rock mechanical problem which is about excavation-induced relaxation of rock foundation，key technologies such as criterion and calculating method of relaxation，finite element algorithm of relaxation effect are deeply studied. Based on laboratory and in-situ rock mechanical experiments，an experiential formula of the shear safety factor effect is provided when rock is anchored. A practical finite element algorithm for the evaluation of relaxation and anchor effect is established. Taking Xiaowan arch dam as background，spatial-time distribution of foundation rock mass relaxation is displayed；two anchoring cases are compared on the basis of stress，deformation，the shear safety factor of critical section in shallow dam foundation and bolt stress. The reliability and practicality of this research is verified by the comparative analysis between numerical simulation and monitoring data. This research has provided a reliable basis for the decision-making.
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Received: 22 April 2013
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2014, Vol. 33 
