Experimental on coupling properties of stress and acoustic emission during coal and rock fracture under multilevel dynamic loadings
SUN Huan1，2，LIU Xiaoli1，CHEN Yulong1
(1. State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China；2. College of Energy Engineering，Xian University of Sciences and technology，Xian，Shannxi 710054，China)
It is a significant task for rock mass stability monitoring to study coupling properties of stress and acoustic emission(AE) of coal and rock fracture under multilevel dynamic loadings. Thispaper is aiming at revealing relations of stress and AE of coal and rock samples under multilevel dynamic loadings. Stress and AE synchronous data has been obtained from mechanic properties testing system of coal and rock samples under multilevel dynamic loadings. The results show that the accumulation stress of coal and rock under multilevel dynamic loadings is obviously less than the maximal compression stress. Then，multilevel dynamic loadings could induce cracks extension according to the felicity effect of coal and rock. Memory characteristic of rock stress shows obvious felicity effect and the felicity ratio presents a decline trending with the larger level dynamic loadings. Also，fractal dimension between stress and AE has been calculated by using of GP algorithm，which could explain the perform of felicity effect reasonably. Coulping properties of stress and AE show more obvious on fractal structure characteristics. The fractal dimension is relatively larger. The felicity effect is not obvious and the fatigue damage and structure defect degree is lower，which show the negative correlation.
孙 欢1，2，刘晓丽1，陈宇龙1. 多级动荷加载条件下煤岩应力–声发射耦合特性试验[J]. 岩石力学与工程学报, 2018, 37(S2): 4076-4085.
SUN Huan1，2，LIU Xiaoli1，CHEN Yulong1. Experimental on coupling properties of stress and acoustic emission during coal and rock fracture under multilevel dynamic loadings. , 2018, 37(S2): 4076-4085.
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2018, Vol. 37 
