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| ANALYSES OF THREE PARAMETERS FOR STRAIN MODE ROCKBURST AND EXPRESSION OF ROCKBURST POTENTIAL |
| SHANG Yanjun1，ZHANG Jingjian2，FU Bingjun3 |
(1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. North China Institute of Water Conservancy and Hydroelectric Power，Zhengzhou，Henan 450011，China；
3. Chinese Society for Rock Mechanics and Engineering，Beijing 100029，China) |
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Abstract On the basis of the 5-factors comprehensive method for rockburst classification，the authors put forward an empirical criterion for expressing rockburst potential and intensity. The field investigation and statistic analyses are carried out with help of interaction matrix approach. The proposed criterion is called rockburst potential ，where is maximum value of shear stress in sides walls； is tensile strength； is the intactness index of rock mass. Corresponding to the 4 grades as intense，moderate，weak and no rockburst，the 3 boundary values are presented as 1.7，3.3 and 9.7. General calculation for depths of H = 1 000 and 2 000 m(lateral coefficient = 1.0)，the values are 3.3 and 6.5，corresponding to upper limit of weak rockburst，and median of moderate rockburst，respectively. Case studies for application show the feasibility and reliability of the index .
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Received: 05 November 2012
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2013, Vol. 32 
