金川二矿区贫矿开采对深部巷道稳定性影响研究  

Study on the Influence of Lean Ore Mining on the Stability of Deep Roadway in Jinchuan No.2 Mining Area

作　　者：孟福杰[1] 张金来 汪兆松 MENG Fujie;ZHANG Jinlai;WANG Zhaosong(No.2 Mining Area,Jinchuan Group Co.,Ltd.,Jinchang,Gansu 737100,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijng 100083,China)

机构地区：[1]金川集团股份有限公司二矿区,甘肃金昌市737100 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2023年第10期74-80,共7页Mining Research and Development

基　　金：国家重点研发计划项目(2018YFC1900603,2018YFC0604604)。

摘　　要：为探究金川二矿区贫矿开采及深部开采叠加效应导致的深部地压活动规律,建立浅部和深部联合回采的三维数值计算模型,通过模拟矿山开采,研究浅部与深部联合回采导致的地压活动规律和巷道变形失稳特征。通过现场调查和监测,对贫矿开采条件下深部采场巷道围岩应力场和位移场的变化规律进行了分析,探究了深部巷道的变形破坏模式及受力状态,预测了1250 m以上贫矿开采对深部巷道围岩的影响。结果表明:1250 m以上贫矿开采对深部各分段巷道围岩均有一定影响,且影响程度随着埋深的增加不断减弱;深部巷道存在分区破裂现象,引起巷道变形破坏的主要因素为顶压,其次是斜向挤压作用。研究贫矿开采对深部巷道回采过程中的巷道稳定性可为矿山深部安全生产提供依据。In order to explore the law of deep ground pressure activity caused by the superimposed effect of lean ore mining and deep mining in Jinchuan No.2 mining area,a three-dimensional numerical calculation model of shallow and deep combined mining was established.Through the simulation of mining,the law of ground pressure activity and the characteristics of roadway deformation and instability caused by shallow and deep combined mining were studied.Through field investigation and monitoring,the change laws of stress field and displacement field of surrounding rock in deep stope roadway under lean ore mining conditions were analyzed,the deformation and failure mode and stress state of deep roadway were explored,and the impact of lean ore mining above 1250 m on the surrounding rock in deep roadway was predicted.The research shows that the lean ore mining above 1250 m has a certain impact on the surrounding rock of each section of the deep roadway,and the degree of impact continues to weaken with the increase of the buried depth.The phenomenon of zonal fracture exists in deep roadway,and the main factor causing the roadway deformation and failure is the roof pressure,followed by the oblique extrusion.The study on the stability of deep roadway during the lean ore mining can provide a basis for the safe production of deep mine.

关 键 词：贫矿开采 深部巷道 数值模拟 现场监测 

分 类 号：TD853[矿业工程—金属矿开采]