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《Rock and Soil Mechanics》 2010-02
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Study of prediction of rockburst intensity based on efficacy coefficient method

WANG Ying-chao, SHANG Yue-quan, SUN Hong-yue, YAN Xi-shui (College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)  
Rockburst is one of the main geological hazards during tunnel construction in high geostress zone. The prediction of possibility and classification of rockburst is one of global problems of tunneling engineering. Based on efficacy coefficient method, a new model for predicting the classification of rockburst is established. Considering the key influential factors of rockburst comprehensively, four factors including σθ /σc, σc/σt, Wet and Is are selected as evaluation indices. The model is tested by a series of rock projects at home and abroad. The obtained results are consistent with practical classification of rockburst and the results of set pair analysis method and extensional method; so it is shown that the efficacy coefficient method used to classify the rockburst intensity is reasonable and effective. Then, the model is applied to Cangling tunnel. The results are in good agreement with practical situation of rockburst. It is proved that the efficacy coefficient method used to classify rockburst intensity is exact and reliable. The efficacy coefficient method is simple and has very strong operability, which possesses a good prospect of engineering application.
【Fund】: 国家自然科学基金项目(No.40672185);; 浙江省重大科技专项社会发展重点项目(No.2006C13027)
【CateGory Index】: U452.11
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