厚煤层综放双巷工作面巷间煤柱尺寸研究

发布时间：2018-03-08 07:27

本文选题：巷间煤柱　切入点：厚煤层　出处：《岩土力学》2017年10期 　论文类型：期刊论文

【摘要】：为解决厚煤层综放双巷布置工作面巷间煤柱的留设问题,以某矿四盘区4301工作面运输顺槽与辅助运输顺槽之间的煤柱为工程背景,首先对巷间煤柱进行理论分析:一次采动影响后将巷间煤柱沿倾向划分为采动影响区、相对稳定区和锚杆支护区,应用极限平衡理论分析得出了一次采动影响区的宽度为2.82 m,进而得出巷间煤柱的宽度为7.83 m。其次,应用数值模拟的方法系统地分析了宽度分别为4、6、8、10、12、15、20 m时,在两次采动影响下巷间煤柱的应力演化、破坏、巷道围岩变形规律;一次采动影响后,随着煤柱宽度增大,氋应力由实体煤向煤柱内转移;给出了最大临界尺寸、最小临界尺寸的定义,并指出巷间窄煤柱宽度应小于最大临界尺寸。综合分析数值模拟研究结果,同时结合理论分析结果及煤柱留设原则,最终确定巷间煤柱宽度为8 m。最后,通过现场工程实践验证了所确定的巷间煤柱宽度的合理性。研究结果对类似条件下综放双巷布置工作面巷间煤柱宽度的确定具有参考意义。
[Abstract]:In order to solve the problem of retaining pillar between roadways in two roadways of fully mechanized caving caving in thick coal seam, taking the coal pillar between the transportation channel and auxiliary transportation channel of 4301 working face in four plates of a mine as the engineering background, Firstly, the theoretical analysis of coal pillar between roadways is carried out: after the influence of first mining, the coal pillar along the roadway is divided into mining affected area, relatively stable area and anchor support area. By using the limit equilibrium theory, the width of the area affected by primary mining is 2.82 m, and the width of coal pillar between roadways is 7.83 m. Secondly, the width of the coal pillar between roadways is analyzed systematically by numerical simulation when the width is 4 ~ 6 ~ 810 ~ (10) ~ (12) ~ (15) ~ (20) m, respectively. Under the influence of twice mining, the stress evolution, failure and surrounding rock deformation of roadway are affected. After the first mining, with the increase of the width of coal pillar, the stress is transferred from solid coal to coal pillar, and the maximum critical size is given. The definition of minimum critical size and the conclusion that the width of narrow coal pillar between roadways should be smaller than the maximum critical size. The comprehensive analysis of numerical simulation results and the combination of theoretical analysis results and the principle of coal pillar retention finally determined the width of coal pillar between roadways to be 8 m. The rationality of the width of coal pillar between roadways has been verified by field engineering practice. The research results have reference significance for determining the width of coal pillar between roadways in the arrangement of two fully mechanized caving roadways under similar conditions.
【作者单位】：中国煤炭科工集团太原研究院;山西天地煤机装备有限公司;
【基金】：山西省煤基重点科技攻关项目(No.MJ2014-03,No.MJ2014-07)~~
【分类号】：TD822.3

【相似文献】