›› 2017, Vol. 38 ›› Issue (4): 1148-1153.doi: 10.16285/j.rsm.2017.04.028

• Geotechnical Engineering • Previous Articles     Next Articles

Stability evaluation and protection technology of waterproof segment pillar with fully-mechanized caving of ultra-thick coal seam

HE Tuan1, 2, MAO De-bing1, 2, HUANG Zhi-zeng1, 2, SUN Xiao-dong1, 2, ZHANG Xue-liang1, 2   

  1. 1. Coal Mining & Designing Department, Tiandi Science & Technology Co., Ltd., Beijing 100013, China; 2. Coal Mining & Designing Branch, China Coal Research Institute, Beijing 100013, China
  • Received:2015-11-16 Online:2017-04-11 Published:2018-06-05
  • Supported by:

    This work is supported by the National Natural Science Foundation of China (51504135) and the Coal Science Research Institute of Science Technology Innovation Fund (2015ZYJ001).

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Abstract: It is the key to ensure smooth connection and safe mining of fully-mechanized top coal caving face by setting a reasonable segment pillar width. To guarantee the stability and effective water resisting capacity of bilateral segment pillar, an analytical model is established to calculate pillar stress. Pillar stability is assessed by means of numerical simulation and a borehole camera. The reasonable scheme of cutting top blasting successfully reduces the effect of mining-induced stress on the pillars in the vicinity of the 3107 working face, accomplishes pillar stress optimization, and ensures safe mining. The study has a certain significance for determining the width of coal pillar and stress release of segment pillar with hard roof under similar mining conditions.

Key words: ultra-thick coal seam, segment pillar, overburden structure, roof cutting pressure relief, stress distribution, superimposed stress

CLC Number: 

  • TD 325

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