CAJ | 학술논문

利用 RMT －150C 电液伺服刚性试验系统和 PAC 声发射信号采集系统，对典型砂岩在巴西劈裂条件下变形破坏全过程的声发射特征以及不同加载速率对其的影响进行研究。试验结果表明：声发射特征与各变形阶段其内部结构损伤信息的变化是相对应的，声发射参数可表征岩石拉伸破坏微观结构损伤和演化；随着加载速率的增大，AE 振铃率和 AE 能量率都随之增大，峰值处释放的 AE 能量最大值呈递增趋势，而 AE 累积能量呈递减趋势，这可能与加载时间有关；砂岩的抗拉强度随加载速率的增大而增大，同步监测 AE 能量峰值亦随加载速率的提高呈上升趋势，不同加载速率下 AE 能量峰值的变化能够反映岩石的抗拉能力。
이용 RMT －150C 전액사복강성시험계통화 PAC 성발사신호채집계통，대전형사암재파서벽렬조건하변형파배전과정적성발사특정이급불동가재속솔대기적영향진행연구。시험결과표명：성발사특정여각변형계단기내부결구손상신식적변화시상대응적，성발사삼수가표정암석랍신파배미관결구손상화연화；수착가재속솔적증대，AE 진령솔화 AE 능량솔도수지증대，봉치처석방적 AE 능량최대치정체증추세，이 AE 루적능량정체감추세，저가능여가재시간유관；사암적항랍강도수가재속솔적증대이증대，동보감측 AE 능량봉치역수가재속솔적제고정상승추세，불동가재속솔하 AE 능량봉치적변화능구반영암석적항랍능력。
The characteristics of acoustic emission in the procedure of deformation and failure of sandstone and effect of different loading rates are studied experimentally under Brazilian split by using PAC acoustic emission acquisition system and RMT -150C electro -hydraulic servo rigidity test system.Results show that the change corresponds with acoustic emission characteristics of each deformation stage and internal structural damage information of sandstone.The microstructure damage evolution of the rock tensile failure under different loading rates can be studied based on acoustic emission characteristics parameters.The AE ringing rate and AE energy rate of sandstone under Brazilian split increases with the increase of loading rates,as well as the maximum AE energy of peak increases with increasing loading rates.The total acoustic emission energy decreases with the increase of loading rates,which may be related to the loading time.The tensile strength of sandstone and AE energy peak of the synchronous monitoring increases with the loading rate,and the tensile strength of rock can be reflected by the change of AE energy peak under different loading rates.