Effects of loading waveforms on rock damage using particle simulation method
Effects of loading waveforms on rock damage using particle simulation method
复制标题
利用粒子模拟方法研究加载波形对岩石损伤的影响
DOI：
10.1007/s11771-018-3866-9
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发表时间：
2018-07
影响因子：
4.4
通讯作者：
Gong Feng qiang
中科院分区：
文献类型：
--
作者：
Xia Ming;Gong Feng qiang
采用颗粒模拟方法，在细观尺度上研究了方波、正弦波和三角波加载波形对岩石损伤的影响。在细观尺度上，采用正弦波形，研究了加载频率、应力幅值、平均应力、围压和加载顺序等因素对岩石损伤的影响。相关数值结果表明：1）加载波形对岩石破坏过程有一定的影响。在这些波形中，方波的损伤最大，而三角波的损伤比正弦波小。在每个循环中，加载阶段微裂纹数量增加，而卸载阶段微裂纹数量基本保持不变。2)加载频率、应力幅值、平均应力、围压和加载顺序对循环荷载作用下岩石损伤有显著影响。加载频率、应力幅值和平均应力越高，岩石累积损伤越大;围压越低，岩石累积损伤越大。3)平均应力和应力幅值存在一个阈值，低于该阈值，在前几次循环载荷后不会累积进一步的损伤。4)从高到低的加载顺序比从低到高的加载顺序具有更大的损伤，这表明岩石损伤是加载路径依赖的。
The particle simulation method is used to study the effects of loading waveforms (i.e. square, sinusoidal and triangle waveforms) on rock damage at mesoscopic scale. Then some influencing factors on rock damage at the mesoscopic scale, such as loading frequency, stress amplitude, mean stress, confining pressure and loading sequence, are also investigated with sinusoidal waveform in detail. The related numerical results have demonstrated that: 1) the loading waveform has a certain effect on rock failure processes. The square waveform has the most damage within these waveforms, while the triangle waveform has less damage than sinusoidal waveform. In each cycle, the number of microscopic cracks increases in the loading stage, while it keeps nearly constant in the unloading stage. 2) The loading frequency, stress amplitude, mean stress, confining pressure and loading sequence have considerable effects on rock damage subjected to cyclic loading. The higher the loading frequency, stress amplitude and mean stress, the greater the damage the rock accumulated; in contrast, the lower the confining pressure, the greater the damage the rock has accumulated. 3) There is a threshold value of mean stress and stress amplitude, below which no further damage accumulated after the first few cycle loadings. 4) The high-to-low loading sequence has more damage than the low-to-high loading sequence, suggesting that the rock damage is loading-path dependent.
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影响因子：
--
作者：
C. Scholz;T. Koczynski
通讯作者：
C. Scholz;T. Koczynski
影响因子：
6.2
作者：
E. Liu;Si-ming He;X. Xue;J. Xu
通讯作者：
E. Liu;Si-ming He;X. Xue;J. Xu
DOI：
10.1016/s1365-1609(01)00058-2
发表时间：
2001-10
影响因子：
7.2
作者：
Ning Li;W. Chen;P. Zhang;G. Swoboda
通讯作者：
Ning Li;W. Chen;P. Zhang;G. Swoboda
DOI：
10.1007/s12613-010-0350-4
发表时间：
2010-10-01
影响因子：
4.8
作者：
Xia, Ming;Zhou, Ke-ping
通讯作者：
Zhou, Ke-ping
影响因子：
1.6
作者：
M. Xia
通讯作者：
M. Xia