下向进路倾斜分层胶结充填体稳定性研究  

Study on Stability of Inclined Layered Cemented Backfill in Downward Drift

作　　者：朱斌 高通 涂艾林 李燕青 葛春毅 张彪 孙伟[2] ZHU Bin;GAO Tong;TU Ailin;LI Yanqing;GE Chunyi;ZHANG Biao;SUN Wei(Northwest Nonferrous Geology and Mining Group Co.,Ltd.,Xi'an,Shaanxi 710054,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;Faculty of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming,Yunnan 650093,China)

机构地区：[1]西北有色地质矿业集团有限公司,陕西西安710054 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]昆明理工大学公共安全与应急管理学院,云南昆明650093

出　　处：《矿业研究与开发》2024年第1期1-12,共12页Mining Research and Development

基　　金：国家自然科学基金资助项目(51964023);云南省重大科技专项计划项目(202202AG050014);省级大学生创新创业训练计划项目(202110674001);云南省基础研究计划项目(202101BE070001-038,202201AT070146).

摘　　要：下向进路胶结充填采矿法在我国金属矿山绿色开采中得到了广泛的应用。通过FLAC3D数值模拟软件研究了不同分层数目、分层角度、充填体厚度及采空区跨度高度比对充填体顶板稳定性的影响规律。研究结果表明:分层数目、分层角度及采空区跨度高度比均与充填体顶板下沉位移呈正相关关系,特别是当跨度高度比增至1.75时,2分层充填体顶板的最大位移达到了24.56cm;充填体厚度与其下沉位移呈负相关关系;不同分层数目下,充填体顶板最大主应力均以压应力形式存在,且分层数目越多,压应力越大;随着分层角度及采空区跨度高度比的增大,顶板最大主应力逐渐由压应力转为拉应力,特别是当分层角度为10°时,2分层充填体顶板的最大拉应力达到了140kPa;随着充填体顶板厚度的减小,顶板压应力集中区域逐渐由“半圆形”转为两头凸起、中间凹陷的“马鞍形”。研究结果可为下向进路充填开采的充填设计和应用提供参考。The downward drift cemented filling mining method has been widely used in the green mining of metal mines in China.The influence of different number of layers,layer angles,backfill thickness and the span-height ratio of the goaf on the stability of the backfill roof was studied by FLAC3Dnumerical simulation software.The results show that the number of layers,layer angles and the span-height ratio of the goaf are positively correlated with the subsidence displacement of the backfill roof.In particular,when the span-height ratio increases to 1.75,the maximum displacement of the backfill roof in 2-layer reaches 24.56 cm.The backfill thickness and its subsidence displacement are negatively correlated.The maximum principal stress of the backfill roof exists in the form of compressive stress under different number of layers,and the more the number of layers,the greater the compressive stress.With the increase of the layer angle and the span-height ratio of the goaf,the maximum principal stress of the backfill roof gradually changes from compressive stress to tensile stress.Especially when the layer angle is 10°,the maximum tensile stress of the backfill roof in 2-layer reaches 140kPa.With the reduction of the thickness of the backfill roof,the concentration area of the compressive stress of the roof gradually changes from“semi-circular”to“saddleshaped”with both ends raised and the middle depressed.The research results can provide reference for the design and application of backfill in downward drift filling mining.

关 键 词：下向进路充填采矿法 分层胶结 充填体稳定性 数值模拟 

分 类 号：TD853.34[矿业工程—金属矿开采]