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| Acoustic emission characteristics and in-situ stresses of bedding rock based on Kaiser effect |
| ZHANG Dongming1，2，BAI Xin1，2，QI Xiaohan1，2，ZHANG Xianmeng1，2，YI Lide1，2 |
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；
2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China) |
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Abstract To meet the need of in-situ stress test in coal mine，acoustic emission experiment under uniaxial compression was carried out to study the failure and acoustic emission characteristics of rock samples from the roof of bedding sedimentary rock series. The comprehensive estimation of Kaiser effecting points and the calculation for in-situ stress based on Kaiser effect were studied. The results showed that，under the uniaxial compression loading，the rock sample without bedding exhibited the characteristics of brittle failure. While bedding rock sample experienced a process of local slip，instability of shear zone and rock sample failure. The total AE counts of rock sample without bedding had the tendency of slow increase to rapid increase，while the bedding rock sample had a step increase. The reason of such difference is due to the difference of the inner damage of rock. A comprehensive judgment method for Kaiser effecting points was derived based on AE characteristics，and an in-situ stress calculating method based on Kaiser effect was improved. Moreover，the final results of in-situ stress were that . = 25.06 MPa， = 13.75 MPa and = 8.07 MPa.
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2016, Vol. 35 
