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Gold Science and Technology ›› 2016, Vol. 24 ›› Issue (2): 76-82.doi: 10.11872/j.issn.1005-2518.2016.02.076

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Research on Instability Control of Horizontal Pillar Roof in Granular Medium

WANG Xiaojun，DENG Shuqiang，LI Yongxin，ZHUO Yulong，FENG Xiao   

  1. School of Resources and Environment Engineering，Jiangxi University of Science and Technology，Ganzhou    341000，Jiangxi，China
  • Received:2015-07-13 Revised:2015-10-20 Online:2016-04-28 Published:2016-05-30

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Abstract:

The key factors which influence stability of access road roof in access back-filling of horizontal pillar in loose medium are coping thickness and roof-contacted area.In order to solve these security risks and achieve the maximum amount of ore recovery，the deformation characteristics and failure mode of backfill roof have been studied by similar material simulation of three methods roof structure of pile groups，sole beam and arch beam based on -240 m horizonal pillar in Fenghuangshan mine.The result indicates that sole beam has the maximum critical roof safety thickness and arch beam has the minimum one，instability of sole beam and pile groups is caused by snipping subsidence from both sides and instability of arch beam is caused by folded damage in the middle.Stability of roof of access road can be improved by effective instability control technique，roof instability usually happens during accelerating creep stage，pile-arch beam structure is put forward as an effective instability control technique.

Key words: horizonal pillar, instability control technique, roof structure, instability mode, similar model, horizonal pillar, instability control technique, roof structure, instability mode, similar model

CLC Number: 

  • TD853

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