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| FAILURE EVOLUTION PROCESS OF FRACTURED ROCKMASS BASED ON AMPLITUDE OF ACOUSTIC EMISSION |
| ZHAO Xiaoping，CHEN Shufen |
| (PowerChina Chengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China) |
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Abstract In general，the problem of rock mechanics is the mechanical behavior of fractured rock-mass in the engineering scale，especially the strength distribution，deformation character and failure evolution of fractured rock-mass under loading. In this paper，the study of failure evolution process and differences between intact coal and fractured coal rock-mass with single fracture and multiple fractures，according to the distribution of max-amplitude of acoustic emission under uniaxial loading，is based on specimens of fractured coal rock-mass obtained by pre-loading on intact coal. The study results are as follows：the value of can describe the distribution regularity of max-amplitude of AE during the failure evolution process under loading，and the value increases with increasing block to the expansion of fractures in specimen；the value of decreases with increasing loading under different stress level and increase with increasing fracture under the same stress level；it can be considered as the precursor of specimen?s failure when the decrease of value becomes flat according to the regularity of value in intact coal and fractured coal rock-mass during the failure evolution process，and that can provide a test basis for the application of AE technology of monitoring and prediction in situ.
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2015, Vol. 34 
