• Title/Summary/Keyword: "flexible-hard" roadside support

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Cooperative bearing behaviors of roadside support and surrounding rocks along gob-side

  • Tan, Yunliang;Ma, Qing;Zhao, Zenghui;Gu, Qingheng;Fan, Deyuan;Song, Shilin;Huang, Dongmei
    • Geomechanics and Engineering
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    • v.18 no.4
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    • pp.439-448
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    • 2019
  • The bearing capacity of roadside support is the key problem in gob-side entry retaining technology. To study the cooperative bearing characteristics of the roof-roadside support-floor along the gob-side entry retaining, a mechanical model of the composite structure of the roof-roadside support-floor was first established. A method for determining the structural parameters of gob-side entry retaining was then proposed. Based on this model, adaptability analysis of roadside support was carried out. The results showed that the reasonable width of the gob-side entry roadway was inversely proportional to the mining height, and directly proportional to the bearing strength of the roof and floor. And the reasonable width of the "flexible-hard" roadside support was directly proportional to its own strength, and inversely proportional to the width of the gob-side entry retaining. When determining the position and size of the roadside support along the gob-side entry retaining, the surrounding rock environment should be fully considered. Measured results from case study also show the rationality of the model and calculation method.