Experimental Study on Acoustic Emission of Weakly Cemented Sandstone considering Bedding Angle

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 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 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).

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

“…By combining acoustic emission characteristics and stress time history curve, the whole failure process of weak cementation can be divided into the stable elastic stage I, crack incubation stage II, crack rapid expansion stage III, and overall failure stage IV [36]. The stable elastic stage is from the start time to the slope inflection point b.…”

“…Under the Brazilian splitting test, Zhao and Liu evaluated the development of the deformation field, acoustic emissions, and energy of four common weakly cemented rocks and discussed the link between the three parameters [35]. Uniaxial compression studies and acoustic emission tests were carried out by Wang et al on weakly cemented sandstone samples from the Xiaojihan coal mine in Shaanxi Province, China [36].…”

Investigation of Anisotropic Behavior and Statistical Evolution of Acoustic Emission Energy during the Deformation of Layered Sandstone

“…Therefore, the acoustic emission monitoring technology is widely used in the field of rock engineering. In terms of layered rock, the acoustic emission monitoring technology is mainly used to analyze the anisotropic characteristics of acoustic emission parameters [21], the relationship between the acoustic emission parameters and stress [22], and the relationship between the acoustic emission parameters and fracture mode [23]. In addition, some scholars adopted the Gutenberg-Richter relationship to analyze the statistical characteristics of acoustic emission parameters during the rock fracture process [24][25][26][27]; however, only a few similar studies exist for layered rocks, especially in terms of the statistical evolution of the acoustic emission energy of layered rocks.…”

Experimental investigation on the tensile properties of weakly cemented sandstone in China Shendong Mining Area

“…Aliabadian et al [8] conducted researches about the crack propagation features and deformation field evolution. The research related to bedding effect and anisotropy has been investigated, including the influencing mechanism of bedding angle, spatial distribution, and value changes of acoustic emission (AE) activity [9][10][11]. Digital image correlation (DIC) has been widely applied to strain measurement of rocks during the failure process due to the progress made in THERMAL SCIENCE: Year 2020, Vol.…”