摘要
无底柱分段崩落法采矿常导致地表塌陷及周边区域开裂与变形,影响周边建筑物安全。塌陷区回填是控制塌陷区周边岩土体变形的常用手段,研究塌陷区回填对地表变形的抑制效果有助于关键区域建筑物的保护。基于金山店铁矿张福山矿区东区塌陷区回填前后的变形监测数据及离散元计算结果,分析了回填对地表不同区域的变形抑制效果及回填量对地表变形的影响。结果表明:塌陷区回填对下盘有良好的抑制效果,但受回填量及回填位置的影响,靠近回填区域的下盘测点受到的抑制作用较大,上盘及端部测点受到的抑制作用较小;当回填量达到一定量级时,回填能有效抑制上下盘土体的变形;目前矿区东区的回填量仍处于较低水平,增加回填量可以有效抑制上盘及端部变形。研究结果可为塌陷区治理提供参考。
Non-pillars sublevel caving mining often leads to surface subsidence as well as cracking and deformation of surrounding areas,which affects the safety of surrounding buildings.Backfilling in subsidence zone is a common means to control the deformation of rock and soil around subsidence zone.Studying the inhibitory effect of backfilling in subsidence zone on surface deformation is helpful to the protection of buildings in key areas.Based on the deformation monitoring data and discrete element calculation results before and after backfilling in the eastern subsidence zone of Zhangfushan mining area of Jinshandian Iron Mine,the inhibitory effect of backfilling on surface deformation in different areas and the influence of backfilling amount on the surface deformation were analyzed.The results show that the backfilling in subsidence zone has a good inhibitory effect on the footwall,but it is affected by the backfilling amount and backfilling position.The footwall measuring points near the backfilling area are greatly inhibited.The hanging wall and end measuring points are less inhibited.When the backfilling amount reaches a certain level,backfilling can effectively inhibit soil deformation of the footwall and the hanging wall.At present,the backfilling amount in the eastern mining area is still at a low level.Increasing the backfilling amount can effectively inhibit the deformation of the hanging wall and the end.The research results can provide a reference for the management of subsidence zone.
作者
樊海云
邵勇
陈从新
FAN Haiyun;SHAO Yong;CHEN Congxin(WISCO Resources Group Jinshandian Mining Co.,Ltd.,Huangshi,Hubei 435116,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第8期148-156,共9页
Mining Research and Development
关键词
塌陷区回填
地表变形
变形监测
离散元
Backfilling in subsidence zone
Surface deformation
Deformation monitoring
Discrete element
