| 单轴压缩条件下预制裂纹岩块破碎过程的数值模拟 |
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| 引用本文： | 申培文,赵伏军,赵延林,黄寿元,王宏宇.单轴压缩条件下预制裂纹岩块破碎过程的数值模拟[J].矿业工程研究,2010,25(4). |
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| 作者姓名： | 申培文 赵伏军 赵延林 黄寿元 王宏宇 |
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| 作者单位： | 1. 湖南科技大学,能源与安全工程学院,湖南湘潭,411201
2. 湖南科技大学,能源与安全工程学院,湖南湘潭,411201;湖南科技大学,煤矿安全开采技术湖南省重点实验室,湖南湘潭,411201 |
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| 基金项目： | 国家自然科学基金资助项目(50974059;50934006); 湖南省自然科学基金资助项目(10JJ3007); 湖南省高校科技创新团队支持计划资助项目 |
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| 摘 要： | 应用FLAC3D软件对含预制裂纹砂浆块和完整砂浆块试样在单轴压缩点荷载作用下的破碎过程进行了数值模拟.结果表明:完整砂浆块的破碎过程首先出现一个应力集中区,形成密实核,然后形成中间裂纹、径向裂纹、侧向裂纹,这些裂纹迅速扩展,并衍生许多新的次生裂纹,沿着剪切或拉应力迹线贯通整个岩块;而含预制裂纹岩块的破碎则是在出现密实核后,随之在裂纹的两个端部出现应力集中,然后沿主载荷方向扩展,形成翼型裂纹,最后贯通整个试件;含预制裂纹试件和完整岩块的破碎应力-侵深曲线均出现跃进式特征,但裂纹试件裂尖局部的应力集中导致了翼型裂纹的产生并且沿主应力方向扩展,较早导致试件的破碎,其临界失稳荷载明显下降,预制裂纹对试件破碎效果的影响是显著的.
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| 关 键 词： | 单轴压缩 数值模拟 临界失稳荷载 裂纹 |
Numerical simulation of the crushing process on rock with preexisted cracks under compression |
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| SHEN Peiwen,ZHAO Fujun,ZHAO Yanlin,HUANG Shouyuan,WANG Hongyu.Numerical simulation of the crushing process on rock with preexisted cracks under compression[J].Mineral Engineeering Reseach,2010,25(4). |
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| Authors: | SHEN Peiwen ZHAO Fujun ZHAO Yanlin HUANG Shouyuan WANG Hongyu |
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| Affiliation: | SHEN Peiwen1,ZHAO Fujun1.2,ZHAO Yanlin1.2,HUANG Shouyuan1,WANG Hongyu1(1.School of Energy and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China,2.Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,China) |
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| Abstract: | A numerical simulation by FLAC3D software approach on breaking process of pre-existing cracks in mortar block samples under compression of point load is carried out.The results show that the fracture process of complete mortar block first appears a stress concentration districts,forming close-grained nuclear,successively intermediate crack,radial crack,lateral crack appear,and these cracks expand quickly,and form many new secondary cracks,which will come along the shear or tensile stress tracing line throug... |
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| Keywords: | uniaxial compression numerical simulation critical collapsing load crack |
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