摘要
为探究沟谷区域极近距离煤层群采空区下下层煤采动规律,以宁夏白芨沟煤矿0102~104工作面为背景,采用理论分析、数值模拟及现场原位测试相结合的方法,对工作面前方应力演化规律、巷道变形特征及山体裂隙演化规律等进行研究。研究表明:极近距采空区导致的层间顶板损伤破坏是造成该范围内采动应力、围岩变形及超前影响区显著较小的直接原因。山体裂隙发育受工作面上覆采空区赋存条件和山体产状共同影响,其发育特征较两者独立作用均有所不同;巷道围岩变形可分为“围岩稳定区—线性上升区”两部分;工作面前方采动应力在采空区影响范围呈“原岩应力—近线性增长”两阶段演化,在单一煤层采动时呈“原岩应力—近线性增长—阶跃式下跌”3阶段演化。研究成果可为类似地质条件下煤炭安全开采提供理论参考。
This study aims to explore the mining-induced behaviors of lower coal seams beneath an extremely close coal seam group goaf area in a valley region.To this end,by taking the 0102'04 working face of Baijigou Coal Mine in Ningxia as the background,the stress evolution ahead of the working face,surrounding rock deformation characteristics of the roadway,and the development of mountain fractures were examined by combining theoretical analysis,numerical simulation,and in-situ field testing.It was found that the inter-layer roof damage caused by the extremely close goaf area is the direct reason for the notably low mining-induced stress,slight surrounding rock deformation,and small advanced influence zone within this range.The development of mountain fractures is jointly influenced by the occurrence conditions of the overlying goaf area and the geological structure of the mountain.As a consequence,their developmental characteristics differ from those when either factor acts independently.The surrounding rock deformation of the roadway can be divided into two parts,i.e.,"a stable zone and a nearly linear rise zone".The mining-induced stress ahead of the working face exhibits a two-stage evolution of"in-situ stress and nearly linear rise"within the influence range of the goaf area,and a threestage evolution of"in-situ stress,nearly linear rise,and stepwise decrease"during single-seam mining.The research findings provide a theoretical reference for safe coal mining under similar geological conditions.
作者
柴敬
高靖博
张丁丁
马哲
赵文华
杨小宁
张军颖
姜龙
CHAI Jing;GAO Jingbo;ZHANG Dingding;MA Zhe;ZHAO Wenhua;YANG Xiaoning;ZHANG Junying;JIANG Long(College of Energy Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Rujigou Anthracite Branch,Ningxia Coal Group Corporation Limited,China Energy Investment Group Co Ltd,Shizuishan,Ningxia 753400,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期487-496,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51804244)
西安市科技项目(6130423016)。
关键词
沟谷地形
极近距离煤层群
采空区
顶板损伤
地表裂隙
围岩变形
valley terrain
extremely close coal seam group
goaf
roof damage
surface fracture
surrounding rock deformation
