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《Chinese Journal of Underground Space and Engineering》 2017-03
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Experimental Study on the Effect of Acoustic Emission Quiet Period of Granite with Water-Saturated

Zhang Yanbo;Liang Peng;Liu Xiangxin;Tian Baozhu;College of Mining Engineering,North China University of Science and Technology;Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory;  
Through uniaxial loading acoustic emission test of dry and water saturated granite,combined with the experimental analysis of scanning electron microscope,effect of water on the acoustic emission quiet period before the destruction of granite was study.The results show that dry and water saturated granite has AE quiet period before rock rupture,the load level is 54.89% when dry granite appear AE calm period,and the saturated granite is 89.87%.The AE event of dry granite is small and constant,and energy rate is high in AE calm period,but AE events rate increases and energy rate decreases after saturated.The AE signal waveform entropy of dry granite ranges from 1.5 to 2.5 in calm period,but the range of full water granite is 0.5~1.5.Water-saturated can change granite microscopic fracture mode,which provides theoretical basis how the water affects the rock acoustic emission characteristics.Experimental results enrich the understanding of acoustic emission calm,which is important for identification precursory phenomena of acoustic emission calm.
【Key Words】: water-saturated granite AE quiet period entropy microscopic structure
【Fund】: 国家自然科学基金(51374088 51174071);; 河北省自然科学基金(E2012209047)
【CateGory Index】: TU45
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