摘要
为解决厚硬顶板沿空巷道变形失稳问题,以淮河能源潘二煤矿12023运输巷为例,在分析了厚硬顶板沿空巷道稳定支护关键影响因素与支护对策的基础上,针对厚砂岩顶板区段和直接顶泥岩厚度>1.5 m区段的两种工况,提出了差异化稳态支护方案及厚硬顶板高低位切顶卸压方案。通过数值模拟方法对分区差异化治理方案的支护力学效应与治理效果进行对比,通过钻孔窥视的方法对顶板切顶卸压效果进行分析。经数值模拟和矿压观测结果得出,采用差异化参数支护厚硬顶板沿空巷道,可使煤柱内产生较高的应力集中区,煤柱从而具有较好的承载能力,巷道围岩松动范围和整体变形量均可控制在合理范围内;采用顶板预裂爆破卸压后,煤柱上方顶板13~17 m区域内有明显裂隙和破碎集中区,通过人工干预方式改变岩体结构,可有效实现应力卸压。工程实践过程中滞后工作面60 m范围内巷道变形趋于稳定,巷道顶板下沉量平均为30 mm,顶底板及两帮平均移近量分别为45 mm、55 mm.差异化分区治理与高低位切顶卸压相结合形成的稳态支护技术有效解决了厚硬顶板沿空巷道围岩变形失稳问题。
To solve the problem of deformation and instability of thick and hard roof roadway along the goaf,taking the 12023 transportation roadway of Pan'er Coal Mine of Huaihe energy as an example,based on the analysis of the key influencing factors and support measures for stable support of thick and hard roof roadway along the goaf,differentiated steady-state support schemes and high and low position cutting and pressure relief schemes for thick and hard roof sections and sections with direct top mudstone thickness>1.5 m are proposed for two working conditions.By using numerical simulation methods,the support mechanical effects and treatment effects of differentiated zoning treatment schemes were compared,and the pressure relief effect of roof cutting was analyzed through drilling observation.Based on numerical simulation and mining pressure observation results,it is found that using differentiated parameters to support thick and hard roof roadway along the goaf can create a high stress concentration zone in the coal pillar,resulting in better bearing capacity of the coal pillar.The loosening range and overall deformation of the roadway surrounding rock can be controlled within a reasonable range.After using roof pre-splitting blasting to relieve pressure,there are obvious cracks and concentrated areas of fragmentation in the 13~17 m area above the coal pillar.By manually intervening to change the rock structure,stress relief can be effectively achieved.In the process of engineering practice,the deformation of the roadway within a range of 60 m behind the working face tends to stabilize.The average subsidence of the roadway roof is 30 mm,and the average displacement of the two sides and the roof and floor are 55 mm and 45 mm,respectively.The steady-state support technology formed by the combination of differentiated zoning governance and high-level and low-level roof cutting and pressure relief has solved the problem of deformation and instability of surrounding rock in thick and hard roof roadway along the goaf.
作者
于朋
王波
王庆牛
YU Peng;WANG Bo;WANG Qingniu(Pan'er Coal Mine,Huaihe Energy Holding Group Co.,Ltd.,Huainan 045008,China;Anhui Provincial Institute of Coal Science,Hefei 230001,China)
出处
《煤》
2026年第2期23-29,80,共8页
Coal
基金
深部煤炭安全开采与环境保护全国重点实验室开放基金资助(2025ZD003)
安徽省重点研究与开发计划项目(1804a0802210)。
关键词
厚硬顶板
沿空巷道
差异化支护
高低位切顶
数值模拟
thick and hard roof
gob-side entry
differentiated support
top cutting at high and low positions
numerical simulation
