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金属矿山 ›› 2016, Vol. 45 ›› Issue (03): 62-66.

• 采矿工程 • 上一篇    下一篇

车辆荷载作用下露天矿采空区顶板安全厚度研究

邓鹏宏,王海龙   

  1. 鞍钢矿业集团,辽宁 鞍山 114001
  • 出版日期:2016-03-15 发布日期:2016-05-17
  • 基金资助:

    * 国家自然科学基金项目(编号:51174208)。

Study on Safety Thickness of Goaf Roof Under the Vehicle Load in Open-pit Iron Mine

Deng Penghong,Wang Hailong   

  1. Ansteel Mining Group,Anshan 114001,China
  • Online:2016-03-15 Published:2016-05-17

摘要: 采空区的存在对露天矿的安全生产构成极大威胁,而顶板是决定空区稳定性的重要因素。针对弓长岭露天矿已探明采空区进行了顶板安全厚度分析。建立了车辆荷载作用下的采空区顶板的力学模型,推导了顶板的振动方程,获得了其安全厚度计算式。结合弓长岭露天矿采空区实际情况,分析了车速、车质量、顶板厚度和跨度对顶板岩梁动态响应的影响规律,计算了不同顶板抗拉强度、跨度组合和不同车质量时的顶板最小安全厚度值,并据此分析了安全厚度的变化规律,对该矿区的安全生产具有重要意义。结果表明:顶板岩梁中的动弯矩与车速、车质量以及顶板跨度近似呈线性关系,且随顶板厚度增加而减小,顶板厚度越小,动弯矩减小幅度越大;顶板最小安全厚度随其抗拉强度增大而减小,随其跨度、车质量的增大而增大。

关键词: 露天铁矿, 空区顶板, 车辆荷载, 动弯矩, 安全厚度

Abstract: The goaf is a great risk to work safely in open-pit mine,and roof is an important factor which affects the stability of goaf.The safety thickness of the proved goafs in Gongchangling open-pit mine was analyzed.The mechanical model of goaf roof under vehicle load was established,by which the vibrating equation of roof was deduced and the calculation formula of safety thickness were gained.Combined with actual situation in Gongchangling open-pit mine,the roof dynamic responses of vehicle speed,vehicle weight,thickness and span to the goaf roof beam were considered.And the minimum safe thickness of the roof with different tensile strength,span and different vehicle weight was calculated out.Based on this,the changing rule of safe thickness is analyzed.The results show that the dynamical bending moment has a linear relationship with the vehicle speed,vehicle weight and the roof span,and its calculated values decrease with the increase of roof thickness.The smaller the roof thickness is,the greater the dynamical bending moment decreasing is;The minimum safe thickness of the roof decreases with the increase of its tensile strength,while increases with the increase of span and vehicle weight.

Key words: Open-pit iron mine, Goaf roof, Vehicle load, Dynamical bending moment, Safety thickness