Pre-peak acoustic emission characteristics of tight sandstone failure under true triaxial stress

Huang，Jie1,2,3; Hu，Qianting1,2; Qin，Chao Zhong1,2; Song，Zhenlong1,4; Wang，Xiaodong1,2

2022-06-01

10.1016/j.jngse.2022.104576

Journal of Natural Gas Science and Engineering   影响因子和分区

1875-5100

2212-3865

In this study, experimental investigations were conducted on low-porosity sandstone specimens to reveal their pre-peak cracking characteristics under constant mean stress (σ, 100 MPa) and varying stress Lode angles (θ, −30° to +30°). The acoustic emission (AE) characteristics 50 s before specimen failure, as well as the strengths and fracturing surface networks, are presented and discussed. The results show that the values of the three principal stresses when the specimen failure occurs change linearly with increasing θ, in which the maximum principal stress linearly decreases. The AE energy distribution exhibits three ranges, which can be speculated as the different stages of rock cracking propagation. The AE peak frequency is distributed unevenly in seven bands, in which over 90% of the AE signals are located in the 75–95 kHz and 96–130 kHz ranges, which correspond to the tensile and shear cracks, respectively. The RA-AF dynamic evolution curves reveal that the ultimate failure is driven by shear fractures under 3D stress states (for all θ). The pattern of macrocrack networks shows the “double-X″ through-going mode, and clear tensile and shear areas were directly observed on the fracturing surfaces. These findings are deemed essential for determining the failure mechanism of deep engineering rock masses.

Acoustic emission Complex 3D stress Lode angle Sandstone

EI ; SCI

英语

其他

National Natural Science Foundation of China[12072053];National Major Science and Technology Projects of China[2016ZX05045004];National Natural Science Foundation of China[41922024];National Natural Science Foundation of China[42004036];

Energy & Fuels ; Engineering

Energy & Fuels ; Engineering, Chemical

WOS:000914047300001

ELSEVIER SCI LTD

20221712009223

Cracks ; Fracture ; Sandstone

Minerals:482.2 ; Acoustic Properties of Materials:751.2 ; Materials Science:951

2-s2.0-85128444659

Scopus

1.State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing,400044,China
2.School of Resources and Safety Engineering,Chongqing University,Chongqing,400044,China
3.Department of Mechanical Engineering,Eindhoven University of Technology,Eindhoven,MB,5600,Netherlands
4.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Huang，Jie,Hu，Qianting,Qin，Chao Zhong,et al. Pre-peak acoustic emission characteristics of tight sandstone failure under true triaxial stress[J]. Journal of Natural Gas Science and Engineering,2022,102.

Huang，Jie,Hu，Qianting,Qin，Chao Zhong,Song，Zhenlong,&Wang，Xiaodong.(2022).Pre-peak acoustic emission characteristics of tight sandstone failure under true triaxial stress.Journal of Natural Gas Science and Engineering,102.

Huang，Jie,et al."Pre-peak acoustic emission characteristics of tight sandstone failure under true triaxial stress".Journal of Natural Gas Science and Engineering 102(2022).