Experimental Research on the Load／Unload Response Ratio （LURR） Theory
摘要
Implementing acoustic emission experiments with large rock samples, LURR (Load/UnloadResponse Ratio) theory was studied. The loading conditions in the experiments were designedto simulate the complicated loading process of underground rocks. The damages emerginginside the rock samples were recorded by the acoustic emission technique during the loadingprocess. The experimental results were consistent with prediction by LURR theory. Integratingthe changing processes of LURR value Y and the location process of acoustic emission eventsshowed agreement between the variation of LURR value Y and the damage evolution inside therocks. Furthermore, the high value of Y emerged before the complete breakdown of materials.Therefore, the damage evolution of rock specimen can be quantitatively analyzed with LURRtheory, thus the failure of the rock materials and the earthquake occurrence may be predicted.The experimental results gave a further verification of LURR theory.