岩土力学2017，Vol.38Issue(10)：3009-3016,8.DOI:10.16285/j.rsm.2017.10.030
厚煤层综放双巷工作面巷间煤柱尺寸研究
Determination of coal pillar width between roadways of fully mechanised caving face with double roadways layout in a thick coal seam
摘要
Abstract
This study is to determine the width of coal pillar between roadways of the fully mechanised caving face with double roadways layout in a thick coal seam.The coal pillar between haulage gate and auxiliary haulage gate of the 4301 working face in the fourth panel was selected as a case study.Firstly,based on theoretical analysis,the pillar between roadways was along tendency divided imo mining influence area,relative stability area and bolt supporting area after the first mining.The width of first mining influence area was 2.82 m determined by using the limit equilibrium theory,and the width of pillar between roadways was subsequently obtained as 7.83 m.Then,a numerical method was conducted to systematically simulate the laws of stress evolution,failure,and roadways deformation of pillars with the widths of 4,6,8,10,12,15 and 20 m under the secondary mining influence.It is found that after the first mining,the high stress transfers from the coal wall to the pillar with the increase of pillar width.Besides,the definitions of the maximum and the minimum critical sizes are given.It is pointed out that the width of the narrow pillar should be less than the maximum critical size.By synthesising numerical results,theoretical results and principles of the pillar,the most favourable width of the pillar between roadways is suggested as 8 m.Finally,the rationality of the pillar width is verified by engineering practice.The results can provide a reference for the determination of narrow pillar between roadways of fully mechanised caving face with similar mining conditions.关键词
巷间煤柱/厚煤层/综放工作面/双巷布置Key words
pillar between roadways/thick coal seam/fully mechanised caving face/double roadways layout分类
矿业与冶金引用本文复制引用
王琦,樊运平,李刚,郭文孝,闫殿华,张立平..厚煤层综放双巷工作面巷间煤柱尺寸研究[J].岩土力学,2017,38(10):3009-3016,8.基金项目
山西省煤基重点科技攻关项目(No.MJ2014-03,No.MJ2014-07).This work was supported by the Shanxi Key Coal Base Science and Technology Project (MJ2014-03,MJ2014-07). （No.MJ2014-03,No.MJ2014-07）
