摘要
本文以程潮铁矿Ⅴ号矿体开采为研究背景,通过3DEC离散元数值模拟软件数值模拟的方法,对无底柱分段崩落法开采地表沉降规律展开研究。该研究通过数值模拟分析了Ⅴ号矿体五个分段逐步回采矿体围岩垂直应力变化情况和上覆围岩垂直位移变化过程,得出无底柱分段崩落法开采地表沉降规律。数值模拟过程中发现,在任意分段回采过程中,上覆围岩同地表之间的距离,与围岩垂直应力的变化大小之间呈现出非线性正相关关系,距离地表越远的围岩垂直应力越大,距离地表越近的围岩垂直应力越小。同时,在对五个分段回采后,上覆围岩的冒落高度最高达到42.5 m,距离地表距离较远。最后,所设置的9条深度不同的监测线,在相同分段的开采活动对不同监测线的沉降影响是不同的,离地表越近的监测线,其监测点沉降量越小,受影响越小。该研究结果可为无底柱分段崩落法开采地表沉降规律研究提供一定指导,并为相关工程实践提供参考。
This paper takes the mining of the No.5 orebody of Chengchao Iron Mine as the research background and studies the surface subsidence law of the orebody mining by using the 3DEC discrete element numerical simulation software.Through numerical simulation,the variation of vertical stress of the surrounding rock and the vertical displacement of the overlying surrounding rock during the step-by-step mining of five sections of the No.5 orebody were analyzed,and the surface subsidence law of the orebody mining by the bottomless sublevel caving method was obtained.During the numerical simulation process,it was found that there was a nonlinear positive correlation between the distance between the overlying surrounding rock and the surface and the magnitude of the change in vertical stress of the surrounding rock.The farther the surrounding rock was from the surface,the greater the vertical stress of the surrounding rock;the closer the surrounding rock was to the surface,the smaller the vertical stress of the surrounding rock.At the same time,after the mining of the five sublevels,the collapse height of the overlying surrounding rock reaches a maximum of 42.5 m,and the distance from the surface is relatively far.Finally,the nine monitoring lines set at different depths are affected differently by the mining activities of the same sublevel.The closer the monitoring line is to the surface,the smaller the subsidence of the monitoring points and the less affected.The research results can provide certain guidance for the study of the surface subsidence law of the sublevel caving method without bottom pillars and provide reference for related engineering practices.
出处
《中国矿山工程》
2026年第1期74-79,91,共7页
China Mine Engineering
基金
湖北省自然科学基金项目(2018CFC818)。
关键词
数值模拟
垂直应力
垂直位移
3DEC
地表沉降
numerical simulation
vertical stress
vertical displacement
3DEC
surface subsidence
