.Research on the coal pillar width of gob-side entry retaining under the damage effect of heterogeneous rock
-
摘要: 目前对沿空留巷煤柱宽度留设的研究集中在煤柱强度、煤柱载荷与煤柱稳定性方面，很少考虑岩石非均质性及损伤效应对煤柱留设宽度的影响。以乌兰木伦煤矿四盘区12煤沿空留巷为工程背景，在考虑岩石非均质性-损伤效应基础上，综合运用理论分析、数值计算、现场实测等方法，研究了煤柱留设宽度。研究结果表明：岩石非均质性-损伤效应模型可较好地反映岩石破裂特征，即在弹性阶段仅有少量颗粒发生破坏，在塑性阶段裂隙开始发育并出现贯通现象，在破坏阶段形成沿对角线方向的宏观剪切裂纹；随着煤柱宽度增大，巷道整体变形量先减小后增大，在煤柱宽度为6 m时发生突变，煤柱周围损伤区域范围及损伤程度不断减小；采动侧巷帮变形量大于非采动侧，但随煤柱宽度改变的变化量较非采动侧小，采空区侧围岩损伤分布大于实体煤侧；根据理论分析、数值计算确定沿空留巷煤柱宽度为5 m并应用于工程现场，工作面前方巷道整体变形量不大，工作面后方60 m后顶板覆岩移动变形基本稳定，验证了沿空留巷煤柱宽度留设的合理性。Abstract: At present, the research on the coal pillar width of gob-side entry retaining focuses on the coal pillar strength, coal pillar load and coal pillar stability. There are few researches on the impact of rock heterogeneity and damage effects on the coal pillar width. Taking the gob-side entry retaining of No.12 coal in the fourth panel of Wulanmulun Coal Mine as the engineering background, the coal pillar width is studied in the context of rock heterogeneity-damage effect and the comprehensive use of theoretical analysis, numerical calculation and field measurement. The research results show that the rock heterogeneity-damage effect model can better reflect the fracture characteristics of the rock. Only a small number of particles are damaged in the elastic stage. Fractures begin to develop and penetrate in the plastic stage. Macro shear fractures along the diagonal direction are formed in the damage stage. As the coal pillar width increases, the overall deformation of the roadway first decreases and then increases. When the coal pillar width is 6 m, a sudden change occurs. The range and degree of damage around the coal pillar continue to decrease. The deformation of the roadway gang on the mining side is larger than that on the non-mining side. However, the amount of change with the coal pillar width is smaller than that of the non-mining side, and the surrounding rock damage distribution on the goaf side is larger than that of the solid coal side. According to the theoretical analysis and numerical calculation, it is proposed that the coal pillar width of gob-side entry retaining is 5 m. The result is applied to the engineering site. The overall deformation of the roadway in front of the working face is not large, and the movement and deformation of the overburden rock after 60 m behind the working face are basically stable, which verify the reasonableness of the coal pillar width of gob-side entry retaining.
-
-
期刊类型引用(11)
1. 张峰华. 安全监控系统在煤矿瓦斯事故预警中的应用与分析. 能源与节能. 2022(02): 212-213 . 
百度学术
2. 段海亮，吴海旭. 煤矿安全监控系统现场运行维护. 陕西煤炭. 2022(04): 202-205 . 百度学术
3. 何云文. 矿井瓦斯涌出风险态势分析平台研究. 能源与环保. 2021(03): 173-177 . 百度学术
4. 廖巍. 蒋家河煤矿瓦斯灾害预警系统研发. 煤炭技术. 2021(11): 128-131 . 百度学术
5. 徐礼金. 基于云计算的瓦斯安全预警系统设计. 煤炭技术. 2021(12): 205-207 . 百度学术
6. 温知强. 矿井安全监控技术与系统. 煤矿现代化. 2020(01): 45-47 . 百度学术
7. 崔明浩. 矿井安全监控技术与系统探究. 科技创新与应用. 2020(35): 127-128 . 百度学术
8. 周颖. KJ2000N安全监控系统瓦斯误报原因分析及防范措施. 科学技术创新. 2019(25): 40-41 . 百度学术
9. 裴韶华，高岩，刘硕. 基于因子分析法构建龙泉煤矿4202工作面多级瓦斯预警模型. 山东煤炭科技. 2019(10): 92-93+97 . 百度学术
10. 张翼. 煤矿安全监控系统联网平台设计. 能源与环保. 2019(12): 33-37 . 百度学术
11. 岳学伟. 煤矿掘进过程中的安全管理探讨. 城市建设理论研究(电子版). 2018(26): 92-93 . 百度学术
其他类型引用(2)
计量
- 文章访问数: 103
- HTML全文浏览量: 12
- PDF下载量: 12
- 被引次数: 13
下载:
