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| The influence of strain rate on AE characteristics during rock deformation |
| GAO Xiang1，LIU Shanjun1，HUANG Jianwei1，YANG Zhengcang1，MAO Wenfei1，WU Lixin1，2 |
(1. School of Resource and Civil Engineering，Northeastern University，Shenyang，Liaoning 110819，China；
2. School of Geosciences and Info-physics，Central South University，Changsha，Hunan 410083，China) |
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Abstract The strain rate is an important factor affecting the mechanical and acoustic emission(AE) characteristics of rock. The AE monitoring experiment of granite specimen with a circular hole under biaxial loading was carried out to study the influence of strain rate on AE characteristics during the elastic deformation process of rock. The relationship between the strain rate and acoustic emission rate(AER) during the rock deformation was studied. The mechanism of influence of the strain rate on AE characteristics was discussed. The trends of the strain rate curve and the AER curve were found to be remarkably similar，both with an increase-decrease-steady tendency in the process of elastic deformation. The relationship between these two curves in the process of plastic deformation was very weak，with the strain rate curve being steady and the AER curve increasing gradually. The variation of the AER was mostly caused by the interior frictional strength of rock，which was mainly determined by the fictional area(related to the interior crack) and the fictional rate(depending on the strain rate). In the elastic stage，the variation of AER was mainly determined by the strain rate，for the fictional area was regarded as constant with no interior cracks formed. In the plastic stage with the strain rate to be constant，the AER trend was determined by the increase of fictional area，which was caused by the appearance of local fissures. The AER variation caused by the interior friction was belong to continuous signal，while the AER variation related to the fracture development could be regarded as the mutational signal. Based on this difference，the concept of mutation rate of acoustic emission(AEMR) was put forward as a new AE index. The AE information caused by fracturing can be extracted effectively and the fracture development can be reflected comprehensively by the analysis of AEMR，combining with the tendency of AER.
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2018, Vol. 37 
