受载岩土破裂过程声发射及数值模拟试验

Experiment of Acoustic Emission and Numerical Simulation During Loaded Rock and Soil Fracturing Process

为利用声发射技术评估岩土稳定性,采用试验和数值模拟方法研究了重庆黄泥包岩土单轴压缩及劈裂过程声发射特征。研究结果表明:岩土在单轴压缩及劈裂破坏过程中均有声发射产生,与压力对应良好;均匀受载时,岩土产生的声发射呈稳态发展趋势;微破裂处,声发射有明显响应;压力峰值处,出现声发射极值。数值模拟岩土单轴压缩破坏过程呈脆性破坏,裂纹扩展从强度较弱的单元开始,逐渐贯穿形成45°主裂纹;声发射信号与应力对应良好。数值模拟岩土单轴压缩破坏过程及声发射与试验结果接近,有助于深入了解岩土损伤过程的声发射特征。

In order to evaluate the rock and soil stability with the acoustic emission technology,the experiment and numerical simulation method was applied to study the acoustic emission features during the uniaxial compression and splitting process of the rock and soil from Chongqing Huangnibao.The study results showed that the rock and soil would have acoustic emissions occurred during the uniaxial compression and the splitting failure process and would have a good corresponding to the pressure.During the even loading,the acoustic emission occurred from the rock and soil would be in stable development tendency.At the micro fractures,the acoustic emission would have obvious in response.At the pressure peak,an extreme value of the acoustic emission would be occurred.During the uniaxial compression failure process of the numerical simulated rock and soil,the failure would be friability;the fracturing expansion would begin from the low strength element and would be steadily penetrated to form the main fracturing with 45°.The acoustic emission would be good corresponding to the stress.The numerical simulation of the rock and soil uniaxial compression failure process and the acoustic emission could be closed to the experiment results and would be favorable to the uniaxial compression features of the systematic and deep rock and soil failure process.