摘要
以宁夏某矿充填试验工作面为背景,采用相似材料模拟实验和理论分析方法,研究了充填开采覆岩应力场、位移场和裂隙场的时空演化规律和覆岩三场时空演化力学机制。结果表明:工作面和煤柱与采充区交界区域应力和位移增加变化大,岩层裂隙发育程度高,三场演化活跃;采充区中部区域,岩层应力和位移增加逐渐稳定,裂隙呈现闭合趋势,覆岩三场演化逐渐稳定。顶板应力和位移经历稳定—活跃—稳定的变化过程,覆岩裂隙则经历发育—离层—闭合的过程。随着工作面推进,三场演化区域由低位岩层向高位岩层扩展,并在厚硬岩层处暂时受到阻碍,采充区中部岩层三场演化稳定区域相应扩大。由力学模型分析覆岩应力、位移、裂隙的相互作用和影响,覆岩三场时空演化与工作面充填开采参数密切相关。最后不同矿井充填工作面的监测结果验证了充填开采覆岩三场时空演化规律,并针对不同采煤顶板条件的三下压煤区域提出原位采空区及时密实充填和中高位岩层空区注充方式的充填控顶对策和措施。研究结果为三下压煤充填开采工程实践提供参考。
Based on the backfill panel of a mine in Ningxia,the spatiotemporal evolution law of stress field,displacement field and fracture field in the overburden and the spatiotemporal evolution mechanical mechanism of overburden three fields in backfill mining are studied by similar material simulation experiment and theoretical analysis method.The results show that the stress and displacement at the junction of the backfill panel or coal pillar and backfilling area increase and change greatly,the development degree of rock stratum fracture is high,and the evolution of three fields is active.In the middle of the mining and backfilling area,the increase of roof stress and displacement is gradually stable,the fracture shows a closed trend,and the evolution of three fields in the overburden is gradually stable.The roof stress and displacement go through a stable-active-stable change process,while the fissures go through a development-separation-closure process.With the advance of the backfill panel,the three fields'evolution area expands from low to high,and is temporarily blocked at the thick and hard rock stratum.The three fields'evolution stable area of the rock stratum in the middle backfilling area expands accordingly.The interaction and influence of overburden stress,displacement and fracture are analyzed by mechanical model.The spatiotemporal evolution of three fields in the overburden is closely related to the parameters of backfill panel.Finally,the monitoring results of different backfill panels verify the spatiotemporal evolution law of the overburden three fields in backfill mining,and put forward the backfilling and roof control countermeasures and measures of timely dense backfilling in the in-situ goaf and backfilling in the goaf of medium and high strata according to"three unders"areas with different mining roof conditions.The research results provide an important reference for the backfilling mining engineering in"three unders"areas.
作者
杨科
赵新元
何祥
周光华
魏祯
张继强
姬健帅
YANG Ke;ZHAO Xinyuan;HE Xiang;ZHOU Guanghua;WEI Zhen;ZHANG Jiqiang;JI Jianshuai(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei,Anhui 230031,China;School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China;National Energy Group Ningxia Coal Industry Co Ltd,Yinchuan,Ningxia 750011,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2023年第4期643-655,共13页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2019YFC1904304)
合肥综合性国家科学中心能源研究院(安徽省能源实验室)科研项目(21KZS217)
安徽省高校研究生科研项目(YJS20210389)。
关键词
原位充填
覆岩三场
时空演化
力学机制
in-situ backfilling
overburden three-field
spatiotemporal evolution
mechanical mechanism
