基于非线性弹性地基梁的地下矿山充填开采覆岩移动规律研究  

Study on the Movement Law of Overlying Strata in Underground Mining with Nonlinear Elastic Foundation Beam

作　　者：何祥锐 邱贤阳[1] 史秀志[1] 李小元 支伟 刘军 王远来 HE Xiangrui;QIU Xianyang;SHI Xiuzhi;LI Xiaoyuan;ZHI Wei;LIU Jun;WANG Yuanlai(School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China;Guangxi Zhongjin Lingnan Mining Co.,Ltd.,Laibin 546100,Guangxi,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]广西中金岭南矿业有限责任公司,广西来宾546100

出　　处：《黄金科学技术》2024年第4期640-653,共14页Gold Science and Technology

基　　金：广西重点研发计划项目“复杂地表环境下地下矿山开采岩移规律及低沉降充填开采技术研究”(编号:2022AB31023);中央引导地方科技发展资金项目“地下矿山层叠采空区地压监测控制及矿柱安全高效回采研究实验室”(编号:来科中引专项20230402)联合资助。

摘　　要：为了研究地下金属矿充填开采覆岩移动规律,以盘龙铅锌矿采场作为研究对象,建立非线性弹性地基梁力学模型,开展了不同采场结构参数、顶板厚度、原岩应力及充填体配比对于覆岩移动的影响研究。研究发现5个因素对于覆岩移动的影响从强到弱依次为充填体配比、采场结构参数、顶板厚度、原岩应力,提高充填体配比是控制覆岩位移的关键。通过采用Flac3D数值模拟方法计算不同充填体配比下覆岩移动值,将数值模拟分析结果与力学理论计算结果进行对比,二者差异率在3%~9%之间,从而验证了力学模型计算结果的可靠性。基于研究结果,提出地下矿山充填开采覆岩沉降控制技术,并将其应用于工业试验。研究成果可为类似矿山进行岩层控制提供借鉴。In the extraction of overlying orebodies in complex environments,it is imperative to prioritize safety and efficiency while preserving the stability of rock strata to prevent surface collapse and safeguard structures.To accomplish these objectives,it is essential to develop effective strategies for managing rock strata movement by comprehensively assessing the impact of underground backfill mining.An initial study was conducted on the impact of various mining field structural parameters,including roof thickness,original rock stress,and backfill ratio,on overlying rock movement at the Panlong lead-zinc mine.This analysis utilized a nonlinear elastic foundation beam mechanical model.Subsequent numerical simulations were performed to determine overlying rock movement values under varying backfill ratios.The results were compared to those obtained from the mechanical model,revealing differences ranging from 3%to 9%,thus validating the reliability of the mechanical model’s results.A ground mine backfill mining technology for controlling settlement of overlying rock was proposed and implemented in industrial experiments.Research findings suggest that the primary factors influencing overlying rock movement,in order of significance,are the backfill ratio,structural parameters of the mining field,roof thickness,and original rock stress.Increasing the backfill ratio is crucial for managing overlying rock displacement,while adjusting anchor support spacing and backfill ratio according to the mining field structure are effective methods for controlling overlying rock displacement.

关 键 词：非线性弹性地基梁 数值模拟 岩层移动控制 充填开采 覆岩移动规律 位移监测 

分 类 号：TD853[矿业工程—金属矿开采]