铜山矿矿岩可崩性评价及崩落演化规律研究  

Research on the Cavability Evaluation and Caving Evolution Law of Rock in Tongshan Mine

作　　者：王宇晨 王堃 王建华 秦秀山 WANG Yuchen;WANG Kun;WANG Jianhua;QIN Xiushan(Heilongjiang Duobaoshan Copper Industry INC.,Heihe 161400,China;BGRIMM Technology Group,Beijing 100160,China;National Center for International Joint Research on Green Metal Mining,Beijing 102628,China)

机构地区：[1]黑龙江多宝山铜业股份有限公司,黑龙江黑河161400 [2]矿冶科技集团有限公司,北京100160 [3]国家金属矿绿色开采国际联合研究中心,北京102628

出　　处：《有色金属工程》2023年第6期115-123,共9页Nonferrous Metals Engineering

基　　金：国家重点研发计划项目(2022YFC2903804)。

摘　　要：为研究铜山矿Ⅱ号矿体自然崩落法的可行性,通过相似工程类比,初步获得了铜山矿矿岩可崩性分级。根据现场工程地质调查数据,基于Laubscher崩落图法建立了铜山矿矿岩可崩性评价模型,获得了三种不同拉底形状条件时的水力半径。利用GPI 3D FDEM构建了铜山矿Ⅱ号矿体自然崩落法三维数值模型,通过研究整个崩落过程中的应力与位移变化,获得了初始崩落面积和持续崩落面积,揭示了拉底速率对矿体崩落效果的影响规律、不同拉底速率拉底过程中底板应力演化规律以及自然崩落法采矿对研究区域地表沉降的影响规律。结果表明:铜山矿矿岩可崩性属中等;初始和持续崩落水力半径分别为15.5、27.5 m;拉底形状为圆形时所需拉底面积最小;发生初始、持续崩落所需拉底面积随长宽比增大而增大;断层破碎带能够促进损伤破裂向其汇集,也对损伤破裂的扩展具有阻隔作用。To study the application feasibility of natural caving method forⅡorebody in Tongshan mine,the caving classification of rock in Tongshan mine was preliminarily obtained through similar engineering analogy.According to the field engineering geological survey data,based on the Laubscher caving diagram method,the evaluation model of rock cavability in Tongshan mine was established,and the hydraulic radii under three different bottom shapes were obtained.GPI 3D FDEM is used to construct a three-dimensional numerical model of natural caving method forⅡore body in Tongshan mine.By studying the stress and displacement changes during the whole caving process,the initial caving area and the continuous caving area were obtained,and the influence law of bottom drawing rate on the caving effect of ore body,the evolution law of floor stress during the bottom drawing process with different bottom drawing rates and the influence law of natural caving mining on surface subsidence in the study area were revealed.The results show that the ore rock of Tongshan mine is moderately collapseable;the hydraulic radius of initial and continuous caving is 15.5 m and 27.5 m respectively.When the bottom shape is round,the required bottom area is the smallest,and the initial caving area is 3010 m 2;The larger the length-width ratio,the larger the bottom area required for continuous collapse;The fault fracture zone can promote the convergence of damage and fracture,and also has a barrier effect on the expansion of damage and fracture.

关 键 词：可崩性评价 崩落规律 数值模拟 

分 类 号：TD853.36[矿业工程—金属矿开采]