基于地表沉陷数据反演的采动覆岩空隙时空演化规律
Space-time Evolution Law of Overlying Strata Voids Based on Surface Subsidence Data Inversion
张占国 1李泽君 2王忠乐 1田明 2刘润1
作者信息
- 1. 中国神华能源股份有限公司,北京 100011
- 2. 中国矿业大学矿业工程学院,江苏徐州 221116
- 折叠
摘要
为明确采动覆岩空隙演化与地表下沉规律,采用现场实测和数值模拟方法,分析相似工作面的地表沉陷与覆岩空隙实测数据,标定研究工作面离散元数值模型参数,分析采动覆岩空隙时空演化规律.结果表明:42106浅埋工作面的地表下沉过程为开始—快速—缓慢—稳定,测点地表下沉速度呈现先增加后减小的几字形.充分采动前覆岩走向空隙率随推进距离增加而增大,充分采动后覆岩走向与倾向空隙率随工作面推进距离增加而减小.
Abstract
In order to clarify the relationship between overlyingstrata voids and surface subsidence,field measurement and numerical simulation methods wereused to analyze the surface subsidence and overlying strata voidsmeasurement data of similar working faces,calibrate the discrete element numerical model parameters of the study area,and study the evolution law of overlying strata voids.The results show that the surface subsidence process of the 42106 shallow buried working face is characterized by initial subsidence,rapid subsidence,slow subsidence,and stabilization.The surface subsidence speed at the measuring points shows a pattern of first increasing and then decreasing.The porosity of the overlying rock increases with the advance distance before full mining,and decreases with the advance distance of the working face after full mining.
关键词
采动覆岩空隙/相似工作面/参数标定/地表下沉Key words
overlying strata voids/similar working faces/parameter calibration/surface subsidence引用本文复制引用
出版年
2025
NETL
NSTL
万方数据