| 马春地,孙光华*,冯禹凡,刘晨阳,王玥.充填体真三轴加卸荷全过程声发射序列分形特征试验研究[J].实验力学,2023,38(4):496~506 |
| 充填体真三轴加卸荷全过程声发射序列分形特征试验研究 |
| Experimental study on fractal characteristics of the acoustic emission sequence of the whole process of filling body true triaxial plus unloading |
| 投稿时间：2022-08-02 修订日期：2022-09-01 |
| DOI：10.7520/1001-4888-22-188 |
| 中文关键词: 真三轴 单向卸荷 声发射 关联维数 振铃计数率 |
| 英文关键词:true triaxial single unloading test acoustic emission association dimension ring count rate |
| 基金项目:河北省自然科学基金项目(E2016209224)；河北省级大学生创新训练计划项目(X2020050)；河北省大中学生科技创新能力培育专项(2021H020910) |
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| 中文摘要: |
| 针对复杂应力条件下充填体因开采导致的瞬态裸露破坏失稳问题，开展充填体三轴加载单向卸荷试验，并结合声发射监测手段及关联维数理论研究充填体因加-卸荷引起的内部损伤特征演化规律。研究结果如下：在不同应力路径的真三轴条件下，充填体均产生X型共轭剪切破坏，且剪切破坏程度受应力载荷影响较大；基于声发射振铃计数率的关联维数能够较好地描述试验过程中充填体内部结构演变过程，且峰后卸荷时呈先增大后减小的规律；当声发射振铃计数率进入平静期且关联维数进入快速下降阶段时，充填体进入失稳阶段。本文研究成果可以为矿石崩落致使充填体侧面裸露时的破坏研究提供参考。 |
| 英文摘要: |
| To address the transient bare damage instability of the filler due to mining under complex stress conditions, a triaxial loading-unloading test was conducted to investigate the internal damage characteristics of the filler due to loading-unloading by combining acoustic emission monitoring means and correlation dimension theory. The results are as follows: under the true triaxial conditions with different stress paths, the filling body produces X-shaped conjugate shear damage, and the degree of shear damage is influenced by the stress load; the correlation dimension based on acoustic emission ring count rate can better describe the internal structural evolution of the filling body during the experiment, and the correlation dimension increases and then decreases when unloading after the peak; when the acoustic emission ring count rate enters the calm period and the correlation dimension When the acoustic emission ring count rate enters the calm phase and the correlation dimension enters the fast decreasing phase, the filling body enters the destabilization phase, and the research results can provide reference for the in-depth understanding of the filling body damage mechanism induced by the lateral exposure of the filling body. |
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