摘要
综放开采覆岩破坏高度及裂隙演化规律对于煤矿安全生产具有重要意义,以山西某矿为试验矿井,采用分段注水、钻孔电视对覆岩破坏高度进行探测,对裂隙变化特征进行定量化分析,并对工作面回采过程中裂隙及应力演化进行数值模拟研究。研究结果表明:采动后冒落带破坏垂直高度为29.8~34.3 m,裂隙带破坏垂直高度为83.8~88.2 m;回采前覆岩裂隙以低角度、小宽度为主,裂隙数量发育程度低,随着工作面的回采覆岩裂隙数量明显增加,增加的裂隙以低角度、中宽度为主;覆岩的整个运动是一个动态的、连续的发育过程;应力呈现增加—减小—稳定的变化特征;采动过程中,近煤层区域覆岩裂隙数量一直处于较高水平。
The fracture height and fracture evolution law of fully mechanized caving mining are of great significance to the safety production of coal mine. Taking a mine in Shanxi as a test mine, the fault height of overburden was detected by subsection water injection and borehole television, the characteristics of fracture change were quantitatively analyzed, and the fracture and stress evolution during mining face were numerically simulated. The results show that the vertical height of failure was 29.8-34.3 m, the vertical height of fracture zone was 83.8-88.2 m;With the increase of the number of cracks in the face, the increase of cracks was mainly low angle and medium width;the whole movement of overburden was a dynamic and continuous development process;the stress shows the characteristics of increasing-decreasing-stable change;and the number of overburden fractures in the near coal seam area was always at a high level.
作者
郎君
LANG Jun(Department of Mining Engineering,Lüliang University,Lüliang 033000,China)
出处
《中国测试》
CAS
北大核心
2022年第3期47-52,65,共7页
China Measurement & Test
基金
山西省高等学校科技创新项目资助(2019L0954)。
关键词
矿业工程
裂隙演化
渗透特征
卸压
mining engineering
fracture evolution
penetration characteristics
pressure relief
