加卸载响应比(LURR)理论的实验研究

Experimental Research on the Theory of LURR (Load/Unload Response Ratio)

利用大尺度岩石试件破坏声发射实验 ,对加卸载响应比 (Load UnloadResponseRatio)理论进行了实验研究。实验采用的加载条件力求能够模拟地下岩石的复杂受力过程。在加载过程中 ,岩石试件内部出现的损伤用声发射技术进行了记录。实验数据经过分析之后所得的结论与加卸载响应比理论预测的结果相符合。把加卸载响应比值Y的变化情况与声发射事件定位的过程相对比 ,也可以进一步看出岩石材料内部的损伤发展过程与加卸载响应比Y值的变化具有一致性。而高Y值的异常情况出现 ,又是在材料发生最终破坏之前 ,所以 ,可以用加卸载响应比理论定量地分析岩石试件损伤演化情况 ,从而对岩石材料的破坏及地震做出预测。实验结果再一次验证了加卸载响应比理论。

Implementing the acoustic emission experiments with the large-scaled rock samples, LURR (Load/Unload Response Ratio) theory was studied. The loading conditions in the experiments were designed to simulate the complex loading process of the underground rock. The damages emerging from inside the rock samples are recorded by the acoustic emission technique during the experimental process. The analyzed results of experimental data are consistent with the prediction by LURR theory. Comparison between the changing processes of LURR value Y and the location process of acoustic emission events showed the agreement between the variety of LURR value Y and the damage development inside the rock. Furthermore, the extremely high value of Y emerged before the complete breakdown of materials. Therefore, the damage development of rock can be analyzed quantitatively with LURR theory thus the failure of the rock material and an earthquake may be predicted. The experimental results gave a further verification on LURR theory.