| 露天矿边坡岩体裂隙测量与卸荷破坏的数值模拟研究* |
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| 引用本文： | 王建明,岳星彤,李天龙,王欢.露天矿边坡岩体裂隙测量与卸荷破坏的数值模拟研究*[J].中国安全生产科学技术,2022,18(8):98-105. |
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| 作者姓名： | 王建明 岳星彤 李天龙 王欢 |
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| 作者单位： | (1.鞍钢集团北京研究院有限公司,北京 102209；2.中国矿业大学（北京） 力学与建筑工程学院，北京 100083；3.中勘冶金勘察设计研究院有限责任公司,河北 保定 071051) |
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| 基金项目： | * 基金项目: 国家自然科学基金项目（52074292）;国家重点研发计划项目（2017YFC1503103） |
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| 摘 要： | 为探究露天矿不同高度边坡卸荷破坏模式的异同，以辽宁鞍山大孤山铁矿某岩质边坡为背景，利用边坡岩体内优势裂隙组产状、迹长和密度等随机分布参数，构建与边坡结构面具有相似分布规律的二维网络模型，借助PFC数值计算软件，探讨不同开采水平下坡体位移场和裂隙发展的时空演化规律以及边坡的破坏模式。研究结果表明:在边坡开挖过程中，出现的裂隙以张拉裂隙为主；裂隙主要出现在靠近坡面一定范围内，从坡面向里，裂隙数量减小，裂隙初始出现在坡脚区域，而后向坡顶发展；边坡开挖后，水平位移由负变为正，且突然增大，而后呈现阶跃型增长；边坡水平和竖向位移最大值发生在坡脚区域和靠近坡面位置，远离坡面，位移逐渐减小。
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| 关 键 词： | 裂隙产状 开挖卸荷 颗粒流 位移演化 |
Numerical simulation study on fracture measurement and unloading failure of slope rock mass in open-pit mine |
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| WANG Jianming,YUE Xingtong,LI Tianlong,WANG Huan.Numerical simulation study on fracture measurement and unloading failure of slope rock mass in open-pit mine[J].Journal of Safety Science and Technology,2022,18(8):98-105. |
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| Authors: | WANG Jianming YUE Xingtong LI Tianlong WANG Huan |
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| Affiliation: | (1.Anstell Beijing Research Inititute Co.,Ltd.,Beijing 102209,China;2.School of Mechanics & Civil Engineering,China University of Mining and Technology,Beijing 100083,China；3.Zhongkan Metallurgical Investigation Design & Research Institute Co.,Ltd.,Baoding Hebei 071051,China) |
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| Abstract: | In order to investigate the similarity and difference of unloading failure patterns of the slopes with different heights in the open-pit mines,a rocky slope in Daguoshan iron mine in Anshan of Liaoning province was used as the background.Using the random distribution parameters such as the occurrence,trace length and density of the dominant fracture group in the slope rock mass,a two-dimensional network model with similar distribution law to the slope structural plane was constructed.With the help of PFC numerical calculation software,the spatial and temporal evolution laws of slope displacement field and fracture development and failure patterns of slopes under different mining levels were explored.The results showed that the fractures appearing in the excavation process of slope were mainly tension fractures.The fractures mainly appeared in a certain range near the slope surface,and the number of fractures decreased from the slope surface to the inside,and the fractures initially appeared at the foot of slope,and then developed toward the top of slope.After the excavation of slope,the horizontal displacement changed from negative to positive and increased suddenly,and then presented a step-type growth.The maximum horizontal and vertical displacement of the slope occurred at the foot of slope and near the slope surface,and the displacement decreased gradually away from the slope surface. |
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| Keywords: | fracture occurrence excavation unloading granular flow displacement evolution |
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