自然崩落法拉底参数对矿岩初始与持续崩落的影响机制  

Mechanism of Initial Caving and Propagative Caving Induced by Undercutting Parameters of Block Caving Method

作　　者：王伟澄 黄明清 刘青灵[1] 高忠 唐绍辉 WANG Weicheng;HUANG Mingqing;LIU Qingling;GAO Zhong;TANG Shaohui(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,China;Zijin Mining Group Co.,Ltd.,Shanghang 364200,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350108 [2]紫金矿业集团股份有限公司,福建上杭364200

出　　处：《金属矿山》2024年第8期1-9,共9页Metal Mine

基　　金：国家重点研发计划项目(编号:2022YFC2903904);国家自然科学基金项目(编号:51804079)。

摘　　要：矿岩自然崩落过程中初始崩落与持续崩落的作用机制影响崩落时空演化规律。为了研究拉底方向与拉底高度对自然崩落法矿山初始与持续崩落过程的影响,采用FLAC3D数值模拟,开展斑岩型厚大铜矿拉底推进方向垂直或平行于最大主应力方向、拉底高度8~12 m条件下的初始崩落条件、持续崩落条件、崩落体形态、崩落矿量的规律研究。结果表明,累积拉底面积与崩落高度呈二次函数关系;在发生初始崩落后,累积拉底面积与累积崩落矿量呈指数函数关系。当拉底方向一定时,崩落高度随着拉底高度的增大而增大,且拉底高度大时有利于提早诱发初始崩落与持续崩落,累积崩落矿量整体呈增长趋势。拉底方向垂直最大主应力时比平行于最大主应力时更易诱发初始崩落、持续崩落。研究结果揭示了拉底参数对矿岩初始与持续崩落的影响机制,可为硬岩矿山自然崩落法的基础研究提供依据。The mechanism of initial caving and propagative caving in the process of orebody's block caving affects the caving temporal-spatial evolution law.In order to study the mechanism of the undercutting direction and height on the initial caving and propagative caving process of block caving mines,orthogonal design and FLAC3D numerical simulation were used to study the initial caving conditions,propagative caving conditions,orebody caving morphology and caving volume under the conditions of the undercutting advancing direction perpendicular to or parallel to the maximum principal stress direction and the caving height of 8~12 m.The results show that there is a quadratic function relationship between the accumulative undercutting area and the caving height.After the initial caving occurs,the accumulative undercutting area and the accumulative caving volume have an exponential function relationship.When the undercutting direction is constant,the caving height increases with the undercut height,and when the undercut height is large,it is beneficial to induce the initial caving and propagative caving in advance,and the accumulative caving volume shows an overall growth trend.When the undercutting direction is perpendicular to the maximum principal stress,it is easier to induce initial caving and propagative caving than when it is parallel to the maximum principal stress.The work reveals the initial and propagative caving of orebody induced by the undercutting parameters,which can provide the basis for the basic research of the block caving method in hard rock mines.

关 键 词：拉底高度 拉底方向 崩落规律 初始崩落 持续崩落 

分 类 号：TD853[矿业工程—金属矿开采]