Energy release law during the damage evolution of water-bearing coal and rock and pick-up of AE signals of key pregnancy disasters
LAI Xingping1，2，3，ZHANG Shuai1，CUI Feng1，2，3，WANG Zeyang1，XU Huicong1，FANG Xianwei1
(1. College of Energy Science and Engineering，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China；
2. State Key Laboratory of Coal Resources in Western China，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China；3. Key Laboratory of Western Mine Exploration and Hazard Prevention，Ministry of Education，Xi'an University of
Science and Technology，Xi'an，Shaanxi 710054，China)
Abstract：Water-bearing state has an important influence on the damage evolution process of coal and rock samples. In order to study the l energy release law in the whole process of damage evolution of coal and rock samples with different water-bearing states under uniaxial compression，to pick up the AE signals of key pregnancy disasters based on the common criteria of energy contribution rate and ringing count contribution rate and hence to guide the application of AE technology in rock mass engineering monitoring and disaster early warning，uniaxial compression tests of coal and rock samples in different water-bearing states are carried out by using rock mechanics test system and full-information AE information analyzer. The mechanical properties，energy release law，failure modes and key parts of disaster AE signals of coal and rock samples under different water-bearing conditions are mainly analyzed. The test results show that the mechanical properties of coal and rock samples are different in different water-bearing states and the increase of water content can effectively weaken the strength of coal and rock samples. The energy release law of coal and rock samples in different water-bearing states is different. While water softens the coal-rock matrix，it also absorbs a large amount of elastic strain energy，which further leads to an increase of the proportion of the elastic strain energy and a rapid decrease of the dissipative strain energy in the loading yield stage of water-bearing coal and rock corresponding to the energy storage period (AE quiet period). When the pore water pressure increases to expand and penetrate the cracks，the sample immediately enters the failure stage. Under different water-bearing conditions，the uniaxial compression failure modes of coal and rock samples are in the form of shear，and the shear crack tends to be complex as the water content increases. The AE signal picking method based on the energy contribution rate and ring count contribution rate calculation criterion is verified to be feasible，and a corresponding relationship with other conventional AE parameters is established. The research results can provide reference for the specific analysis of precursory characteristics and disaster early warning.
来兴平1，2，3，张 帅1，崔 峰1，2，3，王泽阳1，许慧聪1，方贤威1. 含水承载煤岩损伤演化过程能量释放规律及关键孕灾声发射信号拾取[J]. 岩石力学与工程学报, 2020, 39(3): 433-444.
LAI Xingping1，2，3，ZHANG Shuai1，CUI Feng1，2，3，WANG Zeyang1，XU Huicong1，FANG Xianwei1. Energy release law during the damage evolution of water-bearing coal and rock and pick-up of AE signals of key pregnancy disasters. , 2020, 39(3): 433-444.
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2020, Vol. 39 
