摘要
矿产资源开采后遗留的采空区,通过应力再分布达到新的平衡,并形成应力拱承载上覆岩层的重量。当采空区地表进行建设时,地面竖直荷载的增加可能会破坏采空区的应力平衡状态,诱发采空区“活化”,导致安全隐患。为分析矿区地表开发利用适宜性,本文采用附加应力法和数值分析法,展开采空区地面竖直荷载作用下采空区临界扰动深度及其稳定性的研究。结果表明,当竖直荷载影响深度与采空区垮落、裂隙带顶部界面接触时,刚好处于临界稳定状态,结合矿区实际,计算得到矿区当荷载临界扰动深度为31.38 m,并利用FLAC 3D软件的模拟临界状态荷载(240 kPa)下采空区的稳定性,为矿区地灾防治、土地开发利用提供必要依据。
The mined-out area left after the mining of mineral resources achieves a new balance through stress redistribution,and forms a stress arch to carry the weight of the overlying rock.When construction is carried out on the surface of the goaf,the increase of the vertical load on the ground may destroy the stress balance of the goaf,induce the“activation”of the goaf,and cause safety hazards.In order to analyze the suitability of the mining area s surface development and utilization,this paper adopts the additional stress method and the numerical analysis method to study the critical disturbance depth and stability of the goaf under the vertical load of the goaf ground.The results show that when the vertical load influence depth is in contact with the goaf collapse and the top interface of the fracture zone,it is just in a critical stable state.Combining the actual situation of the mining area,the critical disturbance depth of the mining area when the load is calculated is 31.38 m,and the FLAC 3D software is used.The stability of the mined-out area under the simulated critical state load(240 kPa)provides the necessary basis for the prevention and control of ground disasters and land development and utilization in the mining area.
作者
李文博
彭超
张洪岩
马壮
LI Wenbo;PENG Chao;ZHANG Hongyan;MA Zhuang(Real Estate Assessment Center,Shenzhen(Shenzhen Geo-environmental Monitoring Center),Shenzhen 518040,China;Deep Mining Laboratory of Shandong Gold Group Co.,Ltd.,Laizhou 261400,China;BGRIMM Technology Group,Beijing 102628,China)
出处
《中国矿业》
2021年第3期149-154,共6页
China Mining Magazine
关键词
采空区
稳定性研究
附加应力法
数值分析法
荷载影响深度
goaf
stability study
additional stress method
numerical analysis method
load influence depth
