两次采动影响下小煤柱巷道切顶卸压围岩控制技术
Surrounding rock control technology of roof cutting for pressure relief in small coal pillar roadway under secondary mining
李汉璞 1张百胜 1郭俊庆 2杨依卓 1崔俊彪1
作者信息
- 1. 太原理工大学 矿业工程学院,山西 太原 030024
- 2. 太原理工大学 原位改性采矿教育部重点实验室,山西 太原 030024
- 折叠
摘要
为解决多次采动影响下留小煤柱巷道矿压显现剧烈、围岩变形量大的问题,提出了"切顶卸压+顶、帮锚索补强"联合控制技术.以贾家沟煤矿10115 运输巷为工程背景,分析了切顶卸压位置、高度与巷道围岩垂直应力分布的关系,给出切顶卸压关键参数,并研究了留小煤柱巷道在切顶卸压后受两次采动影响下的矿压显现规律.结果表明:切顶卸压后,煤柱上的应力峰值随切顶深度的增加呈指数降低;10115 运输巷在邻近工作面一次采动过程中巷道围岩变形依次呈现出无变形、缓慢变形、快速变形和围岩稳定的变化规律,本工作面二次采动过程中巷道围岩变形依次呈现出明显变形和剧烈变形的规律;巷道围岩在受二次采动影响时变形更加剧烈,巷道变形量为一次采动时的3.0～7.5 倍.
Abstract
In order to solve the problems of severe rock pressure and large deformation of surrounding rock in the roadway with small coal pillar under the influence of multiple mining,a technology combined cutting roof for pressure relief with top and side cable reinforcement was proposed.Taking the 10115 headentry of Jiajiagou Coal Mine as the research object,the relationship between the location and height of cutting roof for pressure relief and the vertical stress distribution of the surrounding rock of the roadway was analyzed,and the key parameters of cutting roof for pressure relief were given.The strata behaviors of the roadway with small coal pillar was studied under the influence of two mining movements after cutting roof for pressure relief.The results show that the peak stress of the coal pillar decreases exponentially with the increase of the roof cutting depth.In the adjacent working face mining process of 10115 headentry,also called the primary mining,roadway surrounding rock deformation changes from no deformation,slow deformation,rapid deformation to stability in turn.In the own working face mining process of 10115 headentry,called the second mining,the roadway surrounding rock deformation changes from apparent deformation to severe deformation.The deformation of the roadway surrounding rock in the secondary mining is much larger than that in the primary mining,about from 3.0 to 7.5 times.
关键词
切顶卸压/小煤柱/矿压显现/二次采动/综放工作面/围岩控制Key words
cutting roof for pressure relief/small coal pillar/strata behaviors/secondary mining/fully mechanized caving face/surrounding rock control引用本文复制引用
基金项目
山西省重点研发计划(201903D121075)
山西省应用基础研究计划面上项目(20210302123148)
出版年
2024
NETL
NSTL
万方数据