(中南工业大学资源环境与建筑工程学院,长沙 410083;
重庆大学资源与环境学院, 重庆 630044)
摘 要: 对描述岩爆倾向的弹性变形能量指 数W ET进行了研究。岩石超声检测试验表明, 在单轴压缩条件下, 岩石试样中弹性波传播速度发生明显变化的特征区间,正好与其强度的80%左右的应力水平具有良好的对应关系,并据此提出了利用弹性波速度变化来控制卸载时机, 达到更准确测定W ET的新试验方法。 这一方法,较好地克服了由于岩石力学性质离散度大对W ET测定准确性的限制。
关键字: 岩爆 应力 弹性应变能指数 弹性波
(College of Resource, Environment and Civil Engineering,
Central South University of Technoloyg, Changsha 410083, P. R. China
1 Chongqing University, Chongqing 630044, P. R. China)
Abstract:The elastic strain energy index (W ET ) for describing rockburst tendency was studied. The ultrasonic measurements for rock samples under uniaxial compression showed that there is a good correspondence between the feature zone that the velocity of elastic wave is evidently changed and the stress level that about 80% of the rock's compression strength. Based on the conclusion, a new experimental method for determining WET was proposed, which can conquer the limit to accuracy of W ET resulting from the dispersion ratio of rock mechanical properties.
Key words: rockburst stress elastic strain energy index elastic wave