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加载波形对岩石损伤影响的颗粒法模拟研究(英文)

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成果类型:
期刊论文
论文标题(英文):
Effects of loading waveforms on rock damage using particle simulation method
作者:
Xia Ming;Gong Feng-qiang
通讯作者:
Xia, M
作者机构:
[Gong Feng-qiang] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.
[Xia Ming] Xiangtan Univ, Hunan Key Lab Geomech & Engn Safety, Xiangtan 411105, Peoples R China.
[Xia Ming] Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan 411105, Peoples R China.
通讯机构:
[Xia Ming] Xiangtan Univ, Hunan Key Lab Geomech & Engn Safety, Xiangtan 411105, Peoples R China.
[Xia Ming] Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan 411105, Peoples R China.
语种:
中文
关键词:
岩石损伤;破裂过程;裂纹起裂与扩展;加载波形;循环加载;颗粒法
关键词(英文):
rock damage;failure process;crack initiation and propagation;loading waveform;cycle loading;particle simulation method
期刊:
中南大学学报(英文版)
期刊(英文):
Journal of Central South University
ISSN:
2095-2899
年:
2018
卷:
25
期:
7
页码:
1755-1765
文献类别:
WOS:Article
所属学科:
ESI学科类别:材料科学;WOS学科类别:Metallurgy & Metallurgical Engineering
入藏号:
基金类别:
Projects(11702235, 51641905, 41472269) supported by the National Natural Science Foundation of China Project(2017JJ3290) supported by the Natural Science Foundation of Hunan Province, China Project(17C1540) supported by the Scientific Research Foundation of Education Department of Hunan Province, China Project(16GES07) supported by the Open Research Fund of Hunan Key Laboratory of Geomechanics and Engineering Safety, China
机构署名:
本校为第一且通讯机构
院系归属:
土木工程与力学学院
摘要:
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. 本文采用颗粒法从细观尺度研究不同加载波形(如矩形波、正弦波、三角波)对岩石损伤的影 响。之后, 针对正弦波, 详细研究了细观尺度岩石损伤的影响因素, 如: 加载频率、应力幅值、平均 应力、加载路径。相关数值结果表明: 1)加载波形对岩石损伤有很大的影响。这些波形中, 矩形波 对岩石损伤影响最大, 正弦波次之, 三角波影响最小。在每个循环中, 微裂纹数目在加载段上升, 而 在卸载段基本保持不变。2)在循环加载下, 加载频率、应力幅值、平均应力、围压和加载路径对岩 石损伤有很大的影响。加载频率、应力幅值、平均应力越大, 岩石中累计的损伤越多。相反, 围压越 小, 岩石中累计的损伤越多。3)平均应力和应力幅值都有一个阈值, 低于这个阈值, 在之前的一些 循环加载步后, 岩石没有损伤累计。4)从高应力到低应力加载比从低应力到高应力加载能对岩石造 成更多的损伤, 表明岩石损伤具有路径相关性。
摘要(英文):
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.
参考文献:
BIENIAWSKI Z T. Mechanism of brittle fracture of rock: Part I—Theory of the fracture process [J]. International Journal of Rock Mechanics and Mining Sciences, 1967, 4(4): 395–404.
PATERSON M S, WONG T F. Experimental rock deformation—The brittle field [M]. 2nd Ed. Berlin: Springer, 2005.
SCHOLZ C H, KOCZYNSKI T A. Dilatancy anisotropy and the response of rock to large cyclic loads [J]. Journal of Geophysical Research, 1979, 84(B10): 5525–5534.
TANG C. Numerical simulation of progressive rock failure and associated seismicity [J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(2): 249–261.
TAO Z, MO H. An experimental study and analysis of the behaviour of rock under cyclic loading [J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1990, 27(1): 51–56.

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