李广尚, 邓丁, 李榕楠, 徐振洋. 下层采空区跨度对采空区顶板稳定性影响分析[J]. 中国矿业, 2020, 29(6): 104-109. DOI: 10.12075/j.issn.1004-4051.2020.06.021
    引用本文: 李广尚, 邓丁, 李榕楠, 徐振洋. 下层采空区跨度对采空区顶板稳定性影响分析[J]. 中国矿业, 2020, 29(6): 104-109. DOI: 10.12075/j.issn.1004-4051.2020.06.021
    LI Guangshang, DENG Ding, LI Rongnan, XU Zhenyang. Analysis of influence of lower goaf span on goaf roof stability[J]. CHINA MINING MAGAZINE, 2020, 29(6): 104-109. DOI: 10.12075/j.issn.1004-4051.2020.06.021
    Citation: LI Guangshang, DENG Ding, LI Rongnan, XU Zhenyang. Analysis of influence of lower goaf span on goaf roof stability[J]. CHINA MINING MAGAZINE, 2020, 29(6): 104-109. DOI: 10.12075/j.issn.1004-4051.2020.06.021

    下层采空区跨度对采空区顶板稳定性影响分析

    Analysis of influence of lower goaf span on goaf roof stability

    • 摘要: 针对齐大山北采区发现的双层采空区,为了分析其稳定性受采空区空间结构的影响规律,在双层采空区正上方进行不同下层采空区跨度的爆破数值模拟试验;在下层采空区的跨度由20 m增大到30 m的过程中,分析了下层采空区顶板中部与两侧的节点峰值振速和单元有效应力,发现下层采空区顶板中部受爆破荷载扰动较大;计算下层采空区顶板的剪切安全系数和拉裂安全系数,发现下层采空区跨度增大,其顶板稳定性减弱。

       

      Abstract: According to the double-layer mined-out area found in the north mining area of Qidashan, in order to analyze the influence law of its stability on the spatial structure of the mined-out area, blasting numerical simulation tests of different lower goaf spans are carried out directly above the double-layer mined-out area.In the process of increasing the span of the lower goaf is increased from 20 m to 30 m, the peak vibration velocity and effective stress of the nodes in the middle and both ends of the roof in the lower goaf are analyzed, and it is found that the most easily damaged goaf is in the middle and both sides of the lower goaf roof are analyzed.It is found that the middle of the lower goaf roof is greatly disturbed by blasting load.The shear safety factors and tensile safety factors of the lower goaf roof are calculated.It is found that the stability of the roof decreases with the increase of the span of the lower goaf.

       

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