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NEW ROCK BURST PRONENESS INDEX |
Tang Lizhong, Wang Wenxing |
(Institute of Rock and Soil Mechanics and Engineering,Central South University, Changsha 410083 China) |
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Abstract From point of view of energy accumulation and energy dissipation during deformation and break of rock, it is pointed out that the ratio of uniaxial compressive strength to uniaxial tensile strength can show the accumulation performance of elastic deformation energy of rock with relatively complete texture and the ratio of total strain before peak strength to total strain after peak strength can show the relation between energy accumulation and energy dissipation. The rockburst proneness index is defined as the product of the two ratios. Testing study is made on the typical rocks at the deep deposit of Dongguashan Mine,Tongling Nonferrous Metal Corporation. Based on the testing results and the investigation of actual rock burst at the mine,the index is analyzed by contrast to existing rockburst proneness index and is verified to be able to show fairly well the rockburst proneness. Finally,a criterion of rockburst proneness is put forward.
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