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| Thermal-acoustic precursor information chain of rock failure under true triaxial loading |
| CHEN Guoqing1，ZHANG Yan1，LI Yang1，PAN Yuangui1，JIN Changyu2 |
(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines，Northeastern University，Shenyang，Liaoning 110819，China)
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Abstract Sudden instability of hard brittle rock often brings disastrous consequences，so it is very meaningful to study the precursor information of sudden instability of hard brittle rock. In this paper，the true triaxial loading tests of red sandstone samples under different intermediate principal stress conditions are carried out. The thermal infrared thermal imaging evolution and temperature characteristics during rock fracture are studied adopting infrared thermal imaging technology，and the crack propagation source，crack propagation trend，acoustic emission characteristics and fracture evolution mechanism of rock under true triaxial loading are analyzed by using the acoustic emission and high-speed video technology. A non-contact pre-warning index of rock fracture based on thermal infrared is proposed，which can give early warning of rock failure before the abnormal temperature change caused by rock fracture. The results show that there are four kinds of precursory information before rock fracture，which are thermal infrared temperature precursory，acoustic emission precursory，thermal image anomaly precursory and rock macro crack precursory. The occurrence times of the thermal infrared temperature precursor and the acoustic emission precursor are relatively early，which can give priority to the early warning of rock failure. The occurrence times of the thermal image anomaly precursor and the macro crack precursor are relatively late， close to the specimen failure. Thermal image anomaly can indicate the potential fracture area of rock. In this paper，the thermoacoustic precursory information chain of hard brittle rock is established from the internal，external，temporal and spatial aspects of rock. The related research can provide a useful reference for the analysis and prevention of sudden rock failure.
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2021, Vol. 40 
