Geomechanics and Engineering

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

  • Tan, Yunliang (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology) ;
  • Ma, Qing (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Zhao, Zenghui (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology) ;
  • Gu, Qingheng (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Fan, Deyuan (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Song, Shilin (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Huang, Dongmei (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology)
  • Received : 2018.11.17
  • Accepted : 2019.07.08
  • Published : 2019.07.20
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Abstract

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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Shandong Province Natural Science Foundation, China Postdoctoral Science Foundation

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