Abstract
Uniaxial compression experiments and acoustic emission (AE) tests were conducted on weakly consolidated sandstone samples with bedding angle of 0°, 45°, and 90° collected from Xiaojihan coal mine in Shaanxi Province, China; the acoustic emission (AE) characteristics of bedding sandstone were investigated, including the influencing mechanism of bedding angle on characteristics, spatial distribution, and b value changes of AE activity. According to the research, AE ringing counting rate and energy rate are the highest and energy release is intense during the loading process when the bedding angle is 0°, and these values decrease and the energy release is gentle with rising of the angle. Based on spatial distribution, the number of AE events was the largest and cluster phenomenon occurs between the bedding plane when the bedding inclination was 0°, which decreased and sprouted along the plane of bedding plane at 45° and which was smaller and evenly distributed in the space at 90°. With the increase of bedding angle, the proportion of large‐scale microcracks decreases and the variation range of microcracks narrows down. Therefore, under the same uniaxial compression conditions, the b value increases by the increase of bedding angle. The research results offer reliable reference to carry out monitoring work on acoustic emission and microseism of mine with layer rock (rock mass).
Highlights
With the popularization of mechanization and high-intensity mining of coal mines in western China, prevention of mine roof and floor accidents and disasters had become an important issue in coal mine safety production
(1) Bedding plane has an important influence on the compression strength of the rock
(2) Bedding plane is related to the acoustic emission (AE) activities during the loading process of rock
Summary
With the popularization of mechanization and high-intensity mining of coal mines in western China, prevention of mine roof and floor accidents and disasters had become an important issue in coal mine safety production. Hou et al [7] conducted the Brazilian disk-splitting tests on black shale from different bedding angles for study of the anisotropic characteristics of tensile strength and failure mode and the variation of absorption energy in deformation in the failure process. Chong et al [9] studied the anisotropy of the stratigraphic shale by numerical simulation of Brazilian splitting experiments and proposed the AMBBM model They found found that the ratio of cohesion to tensile strength of SJ mainly affects the number of cracks formed, which further leads to different failure modes. Acoustic emission (AE) technology can effectively and continuously monitor generation and expansion of fine cracks in brittle materials in real time under load effects and achieve positioning of the cracks It has become an important monitoring method for rock or rock mass deformation and failure. It is of academic value to reveal the mechanism of stratified rock in depth by means of acoustic emission
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