| 综合拉底、扩漏和出矿全过程的底部结构安全性颗粒流模拟技术研究 |
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| 引用本文： | 贾明涛,史存丁,余传玉.综合拉底、扩漏和出矿全过程的底部结构安全性颗粒流模拟技术研究[J].中国安全生产科学技术,2019,15(4):25-31. |
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| 作者姓名： | 贾明涛 史存丁 余传玉 |
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| 作者单位： | （中南大学 资源与安全工程学院，湖南 长沙 410083） |
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| 基金项目： | 基金项目: 国家重点研发计划项目（2017YFC0602905） |
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| 摘 要： | 为探明自然崩落法从拉底崩落至出矿全过程中底部结构节理连续扩展过程与破坏过程规律,采用PFC2D软件,结合Roc Lab软件反演节理岩体参数,建立229 m×129 m的岩体扩大模型,对拉底崩落至出矿过程进行连续综合计算。研究结果表明:模拟结果及破坏现象与现场监测结果相近,建模与细观参数反演方法适用于该类岩体工程研究;裂纹扩展贯通导致岩体失稳破坏,破坏过程与裂纹扩展具有相对应的阶段特征,裂纹扩展分为崩落前稳定扩展期,崩落与聚矿槽开挖过程加速扩展期和后续持续扩展期;结构破坏分为蕴育过程,扰动失稳过程和宏观破坏过程;较大范围的宏观破坏主要在出矿阶段。该模拟方法与结果可为底部结构维护以及节理岩体长期稳定性研究提供参考。
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| 关 键 词： | 底部结构 节理扩展演化 破坏过程 颗粒流方法 建模与参数反演 |
Particle flow simulation technology of bottom structure safety of the whole process of comprehensive undercutting,enlargement of drawpoint and ore drawing |
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| JIA Mingtao,SHI Cunding,YU Chuanyu.Particle flow simulation technology of bottom structure safety of the whole process of comprehensive undercutting,enlargement of drawpoint and ore drawing[J].Journal of Safety Science and Technology,2019,15(4):25-31. |
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| Authors: | JIA Mingtao SHI Cunding YU Chuanyu |
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| Affiliation: | (School of Resources and Safety Engineering, Central South University, Changsha Hunan 410083, China) |
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| Abstract: | In order to find out the law of continuous expansion and failure process of bottom structure joints during the whole process of natural caving from the bottom caving to ore drawing, a 229 m*129 m rock mass enlargement model is established by using PFC2D software and Roclab software to invert the jointed rock mass parameters, and the continuous comprehensive calculation of the bottom caving to ore drawing process is carried out. The results show that the simulation results and failure phenomena are similar to the on site monitoring results. The modeling and meso parameters inversion are suitable for this kind of rock mass engineering research. Corresponding stage characteristics, crack propagation is divided into stable expansion period before caving, acceleration and expansion period of caving and mining trench excavation process and subsequent continuous expansion period.The structural failure process can be divided into cultivation process, disturbance instability process, and macro damage process. A wide range of macro damage in a larger scale is mainly at stage of the ore drawing. The simulation method and results can provide reference for maintenance of the bottom structure and the long term stability study of jointed rock mass. |
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| Keywords: | bottom structure joint propagation evolution failure process particle flow method modeling and parameter inversion |
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