孙学阳, 张慧萱, 卢明皎, 李成, 苗霖田. 浅埋煤层过双沟地形开采地表裂缝发育规律[J]. 煤田地质与勘探, 2021, 49(6): 212-220, 229. DOI: 10.3969/j.issn.1001-1986.2021.06.025
引用本文: 孙学阳, 张慧萱, 卢明皎, 李成, 苗霖田. 浅埋煤层过双沟地形开采地表裂缝发育规律[J]. 煤田地质与勘探, 2021, 49(6): 212-220, 229. DOI: 10.3969/j.issn.1001-1986.2021.06.025
SUN Xueyang, ZHANG Huixuan, LU Mingjiao, LI Cheng, MIAO Lintian. The development law of surface cracks in shallow coal seam mining through double gullies terrain[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 212-220, 229. DOI: 10.3969/j.issn.1001-1986.2021.06.025
Citation: SUN Xueyang, ZHANG Huixuan, LU Mingjiao, LI Cheng, MIAO Lintian. The development law of surface cracks in shallow coal seam mining through double gullies terrain[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 212-220, 229. DOI: 10.3969/j.issn.1001-1986.2021.06.025

浅埋煤层过双沟地形开采地表裂缝发育规律

The development law of surface cracks in shallow coal seam mining through double gullies terrain

  • 摘要: 为保护黄河流域矿区生态环境,以府谷县庙哈孤矿区安山煤矿125203工作面为背景,采用数值模拟实验、相似材料模拟实验和理论分析相结合的手段,基于工作面过双沟地形开采时地表裂缝发育位置、发育形态等参数,总结出开采诱发地表裂缝发育规律。通过理论分析,建立了浅埋煤层过双沟地形开采地表裂缝发育相对位置函数T及其判别条件,讨论了双沟地形沟谷参数与地表裂缝发育相对位置之间的关系。研究表明,工作面过支沟G1时,共发育地表裂缝4条,最大裂缝宽度23 cm,最大错台11 cm,裂缝发育超前于工作面推进;过主沟G2时共发育地表裂缝7条,最大裂缝宽度79 cm,最大错台45 cm,裂缝发育滞后于工作面推进。裂缝发育相对位置受地质条件、沟深、坡度和沟谷跨度等因素共同影响。地表裂缝发育相对位置函数与裂缝超前(滞后)距离、裂缝宽度和错台以及单沟裂缝总条数密切相关。双沟相互影响程度与工作面推进方向有关。研究结果可为浅埋煤层沟谷下开采地表裂缝发育研究提供一定的理论依据。

     

    Abstract: In order to protect the ecological environment of the mining area in the Yellow River Basin, the mining-induced surface crack development law was summarized from the parameters of surface crack development location and development morphology during mining of the working face passing through the double gullies terrain by using a combination of numerical simulation experiments, similar material simulation experiments and theoretical analysis in the context of the working face 125203 of Anshan Coal Mine in Miaohagu Mining Area of Fugu County. Through theoretical analysis, the relative position function T of surface cracks in shallow coal seam mining through double gullies terrain and its discriminant conditions was established and the relationship between the relative location of the surface crack growth and double gullies terrain parameters was discussed. The study shows that when the working face passes through the G1 gully, there are 4 surface cracks, with the maximum crack width of 23 cm and the maximum faulting of slab ends of 11 cm. It means that the development of cracks is ahead of the working face; when passing through the G2 gully, there are 7 surface cracks, with the maximum crack width of 79 cm and the maximum faulting of slab ends of 45 cm. The development of cracks lags behind the advancement of the working face. The results indicate that the crack development shape is greatly affected by geological conditions, gully depth, slope and valley span and other factors. The relative position function T of surface cracks is closely correlated with the crack distance ahead or behind, crack width, fault table and the total number of cracks in a single gully. The degree of mutual influence of double trenches is related to the direction of working face advance. The results of the study can provide some theoretical basis for mining under valleys in shallow coal seams.

     

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