摘要
通过分析岩石变形破坏过程中的能量变化 ,提出以岩石在峰值强度前储存的弹性应变能和峰值强度后稳定破坏所需的能量耗散之差 (即剩余能量 )与峰值强度后稳定破坏所需的能量耗散之比作为剩余能量指数 ,以反映岩石在峰值强度后区的动态特性 ;推导了剩余能量指数计算公式 ,并给出了其试验测定方法 .此外 ,分析了将剩余能量指数作为岩爆倾向性指标的合理性 ,并采用铜陵有色金属公司冬瓜山深部矿床的典型矿岩进行了峰值前的循环加、卸载试验和变形破坏全过程试验 ,结合该矿床实际岩爆资料 ,对剩余能量指数与现有基于能量理论的岩爆倾向性指标进行对比分析 。
On the basis of analyses of the variation of energy in the course of the deformation and break, a new index called as surplus energy index is defined as the ratio of surplus energy, i.e., the difference between elastic strain energy stored in rock before peak strength and energy dissipated in the course of steady break of rock after peak strength, to the energy dissipated, so as to reflect the dynamics of rock in the course of break after peak strength. The measurement and formula of the index are put forward. The reason why the index can be used to show rock burst proneness is analyzed. Tests of cyclic load unload before peak strength and total stress strain tests are carried out with the typical rocks of Dongguashan deep ore deposit of Tongling Nonferrous Metal Corporation, and in the light of the results of these tests and the actual rock bursts of this deep ore deposit, the index is contrasted with existing rock burst proneness indices based upon energy theories, and proved to be able to reflect actual rock burst proneness and to be used as rock burst proneness index.
出处
《中南工业大学学报》
CSCD
北大核心
2002年第2期129-132,共4页
Journal of Central South University of Technology(Natural Science)
基金
国家"九五"科技攻关计划项目 (96 116 0 1 0 1 0 2 )
