Study on in situ stress testing method based on Kaiser effect of acoustic emission and COMSOL simulation
Chenyu WANG, Dongming ZHANG, Shujian LI, Yu CHEN, Chongyang WANG, Kangde REN
Study on in situ stress testing method based on Kaiser effect of acoustic emission and COMSOL simulation
In situ stress testing can improve the safety and efficiency of coal mining. Identifying the Kaiser effect point is vital for in situ stress calculations; however, the in situ stress calculation is limited by the rock sampling angle. Here, the Kaiser effect point identification theory is established and applied to the Xuyong Coal Mine. Uniaxial compression and acoustic emission experiments were carried out on sandstone with 6 sampling directions. Furthermore, COMSOL simulation is applied to study the in situ stress distribution in the coal mine to verify the calculation accuracy. The results are as follows. 1) The failure mode of non-bedded and vertical-bedded rocks is primarily tensile shear failure with obvious brittleness in mechanical and acoustic emission characteristics. Shear slip along the bedding plane is the primary failure mode of inclined-bedded rock. Additional take-off points exist in the AE count curve. 2) The Kaiser point identification method based on the variation of AE count curve parameters and can effectively calculate the in situ stress. According to the numerical value of Kaiser point and sampling direction, the in situ stress of the conveyor roadway in the Xuyong Coal Mine was calculated as , and . 3) By the COMSOL simulation study, it was found that a stress concentration zone of 16.13 MPa exists near the two sides roadway. Compared with the Kaiser effect method, the deviation rates of the three-direction principal stress calculated by COMSOL were all less than 5%. This verifies that the in situ stress calculation by Kaiser effect in this study can be applied to the Xuyong Coal Mine.
Kaiser effect point / in-situ stress calculation / Xuyong Coal Mine / uniaxial compression / acoustic emission / COMSOL simulation
Chenyu Wang is a Doctoral candidate of the Resources and Safety Engineering College of Chongqing University (Chongqing, China). His research interests include rock mechanics, geology and geophysics
Dongming Zhang is a Professor of the Resources and Safety Engineering College of Chongqing University (Chongqing, China). He mainly focus on elastoplastic mechanics, geology and coal mining technology
Shujian Li is a Lecturer of the Yunnan Phosphate Chemical Group Co., Ltd (Yunnan, China). His is mainly engaged in geotechnical mechanics, algorithm development and instrumentation technology
Yu Chen and Chongyang Wang are Doctoral candidates of the Resources and Safety Engineering College of Chongqing University (Chongqing, China). Their research interests include rock mechanics, geophysics and mine pressure management
Kangde Ren is a Postgraduate student of the Resources and Safety Engineering College of Chongqing University (Chongqing, China). His is mainly engaged in elastoplastic mechanics, physical geography and algorithmic modeling
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The physical parameters of rock samples
Physical parameters | X-axis | Y-axis | Z-axis | |||
---|---|---|---|---|---|---|
Length/mm | 100.1 | 100.0 | 99.9 | 100.0 | 99.8 | 100.1 |
Diameter/mm | 49.9 | 50.0 | 50.0 | 49.9 | 50.1 | 49.9 |
Quality/g | 495.47 | 488.32 | 495.09 | 487.74 | 493.03 | 402.09 |
Density/(g·cm−3) | 2.531 | 2.487 | 2.524 | 2.494 | 2.506 | 2.054 |
Kaiser effect point parameters
Drilling direction of rock specimen | Time/s | /s | /(° ) | Stress/MPa |
---|---|---|---|---|
X-axis | 164.27 | 0.16 | 87.41 | 17.0 |
Y-axis | 246.25 | 0.21 | 89.93 | 20.0 |
Z-axis | 345.53 | 0.19 | 88.42 | 24.0 |
X∠40°Y | 311.45 | 0.10 | 88.76 | 6.7 |
Y∠55°Z | 286.84 | 0.15 | 87.94 | 17.2 |
X∠30°Z | 318.93 | 0.10 | 89.69 | 14.5 |
In situ stress results by the Kaiser effect
In situ stress | Values/MPa | Azimuth angle/(° ) | Inclination angle/(° ) |
---|---|---|---|
Maximum principal stress () | 22.81 | 162.35 | −7.52 |
Intermediate principal stress () | 10.87 | 61.25 | −81.65 |
Minimum principal stress () | 6.14 | 257.68 | −13.56 |
Rock physical and mechanical parameters
Density/(kg·m−3) | Elastic modulus/GPa | Poisson᾽s ratio | Cohesion/MPa | Friction angle/(° ) | Tensile strength/MPa |
---|---|---|---|---|---|
2700 | 39 | 0.28 | 8 | 37 | 1.2 |
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