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  • 謝曉深, 侯恩科, 馮棟, 從通, 侯鵬飛, 陳秋計, 王建文, 李民峰, 謝永利. 榆神府礦區采煤地表裂縫發育規律及特征[J]. 工程科學學報, 2023, 45(1): 44-53. DOI: 10.13374/j.issn2095-9389.2021.06.29.001
    引用本文: 謝曉深, 侯恩科, 馮棟, 從通, 侯鵬飛, 陳秋計, 王建文, 李民峰, 謝永利. 榆神府礦區采煤地表裂縫發育規律及特征[J]. 工程科學學報, 2023, 45(1): 44-53. DOI: 10.13374/j.issn2095-9389.2021.06.29.001
    XIE Xiao-shen, HOU En-ke, FENG Dong, CONG Tong, HOU Peng-fei, CHEN Qiu-ji, WANG Jian-wen, LI Min-feng, XIE Yong-li. Development law and characteristics of surface cracks caused by coal mining in Yushenfu mining area[J]. Chinese Journal of Engineering, 2023, 45(1): 44-53. DOI: 10.13374/j.issn2095-9389.2021.06.29.001
    Citation: XIE Xiao-shen, HOU En-ke, FENG Dong, CONG Tong, HOU Peng-fei, CHEN Qiu-ji, WANG Jian-wen, LI Min-feng, XIE Yong-li. Development law and characteristics of surface cracks caused by coal mining in Yushenfu mining area[J]. Chinese Journal of Engineering, 2023, 45(1): 44-53. DOI: 10.13374/j.issn2095-9389.2021.06.29.001

    榆神府礦區采煤地表裂縫發育規律及特征

    Development law and characteristics of surface cracks caused by coal mining in Yushenfu mining area

    • 摘要: 榆神府礦區是陜北一個重要的原煤產地,煤炭開發利用規模大、強度高,但區內生態環境脆弱,采煤誘發的礦山地質環境問題尤為顯著。為全面掌握榆神府礦區采煤地表裂縫“靜”、“動”態發育規律、揭示其形成機理,以榆神府礦區的安山煤礦、檸條塔煤礦和小保當一號井的典型工作面為對象開展研究。研究結果表明:① 地表裂縫分為臺階型、擠壓隆起型、滑動型和拉張型4種類型以及“塌陷槽”、“平行并列”2種組合方式;② 榆神府礦區地表裂縫平面展布規律具有相對統一性,而地表裂縫表現特征具有差異性,且與采深采厚比呈負相關關系;③ 極淺埋煤層開采、淺埋煤層開采以及中深埋煤層開采地表裂縫分別具有滯后回采位置1.0 m、超前回采位置8.5 m和滯后回采位置30.14 m的動態展布規律,且地表裂縫滯后距與采深采厚比之間存在多項式的函數關系;④ 邊界裂縫和面內正向坡裂縫具有“只開不合”的活動特征,面內逆向坡裂縫具有“先開后合”的活動特征,面內平坦區裂縫則具有“先開后合再開”和“先開后合”兩種裂縫活動特征,平均活動時間3.7~7.0 d;裂縫“先開后合再開”的活動受覆巖運移控制,“只開不合”和“先開后合”的裂縫活動受地表移動變形控制,而斜坡裂縫活動機理則與坡體滑移密切相關。研究成果可為榆神府礦區地表裂縫治理和生態修復提供指導。

       

      Abstract: Yushenfu mining area, with large scale and high intensity, is an important raw coal-producing area in northern Shaanxi, but the fragile ecological environment makes the mine geological environment problems caused by coal mining particularly relevant. To grasp the development law of surface cracks and reveal the formation mechanism caused by coal mining in the Yushenfu mining area, the typical working faces of Anshan Coal Mine, Caragana Tower Coal Mine, and No. 1 Coal Mine of Xiaobaodang in the Yushenfu Mining area were chosen as the research object to conduct the study. The results show that the surface cracks can be divided into four types: step type, extrusion uplift type, sliding type, and tension type, as well as two combination modes of collapse, trough and parallel. In the Yushenfu mining area, the spatial distribution law of surface cracks is relatively unified. The performance characteristics of surface cracks are different and negatively correlated with the ratio of mining depth to mining thickness. The surface cracks induced by very shallow coal seam mining, shallow coal seam mining, and medium-deep coal seam mining have the dynamic law of lagging mining position 1.0 m, advanced mining position 8.5 m, and lagging mining position 30.14 m, respectively, and the relationship between the lag distance of surface cracks and the ratio of mining depth to mining thickness is a polynomial function. The characteristic of the width of boundary cracks and forward slope cracks in the working face was increased until stable. In contrast to the boundary cracks, the characteristic of the width of the reverse slope fractures increases and then decreases, and the width of the cracks in the flat area in the working face increases first, then declines, and then increases. The average activity time was 3.7–7.0 days. The crack with the activity of “opening first and then closing” is controlled by the dynamic evolution of overlying rock structure, and the fracture with the activity of “only opening and then closing” and “opening first and then closing” was controlled by surface dynamic evolution. However, the activation mechanism of slope fracture is closely related to slope slip. The findings of this study can provide theoretical guidance for surface crack control and ecological restoration in the Yushenfu mining area.

       

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