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Mine Water and the Environment

, Volume 37, Issue 3, pp 565–576 | Cite as

Assessment and Prevention of Water and Sand Inrush Associated with Coal Mining Under a Water-filled Buried Gully: A Case Study

  • Gangwei Fan
  • Dongsheng Zhang
  • Shizhong Zhang
  • Chengguo Zhang
Technical Article
  • 242 Downloads

Abstract

Mining under a water-filled buried gully risks a potentially serious water and sand inrush, especially if the bedrock is thin. A case study was conducted at a Chinese coal mine, where the thin overlying overburden was covered by widely distributed gullies. Several empirical formulas and numerical modelling indicated that the overlying strata was almost totally fractured and that all of the conditions for an inrush were met. Pre-mining dewatering and grout injection were initiated. The groundwater table was lowered by 13 surface pumping wells and 33 underground upholes that were drilled around the gully. Those located at the bottom of the gully were generally better in aquifer dewatering than those located at the banks. A barrier was constructed to avoid a water inrush by injecting a chemical grout into the bottom of the buried gully through 25 surface holes. Field observations of the water table, underground water yield, and overburden movement prove the validity of the assessment methods and treatments.

Keywords

Underground mining Buried gully Numerical modelling Aquifer dewatering Grout injection 

隐伏含水沟谷下采煤的突水、溃沙危险性评价和预防-案例研究

抽象

隐伏含水沟谷下采煤尤其是在薄基岩条件下具有潜在突水和溃沙危险。以中国某煤矿为例,研究区薄覆盖层上沟谷广布。经验计算和数值模拟结果表明,上覆地层裂隙发育且具有突水危险。采用采前疏水和注浆综合防治措施。在隐伏沟谷附近施工13个地面钻孔和33个井下上仰孔疏降地下水位。沟谷底疏水孔的疏降效果比沟谷边缘疏水孔更好。通过25个地面孔向沟谷底化学注浆建立隔水屏障。野外水位、水量和覆岩移动监测证明了该方法的合理性。

Beurteilung und Vermeidung von Wasser- und Sandeinbrüchen im Zusammenhang mit Kohlenabbau unter einer mit wassergesättigten Sedimenten gefüllten Erosionsrinne: Eine Fallstudie

Zusammenfassung

Bei Abbau unter mit wassergesättigten Sedimenten gefüllten Erosionsrinnen kann es zu schwerwiegenden Wasser- und Sandeinbrüchen kommen, insbesondere wenn das Felshangend geringmächtig ist. In einem chinesischen Kohlenbergbau bei dem das geringmächtige Felshangend von ausgedehnten Erosionsrinnen überlagert wird, wurde eine Fallstudie durchgeführt. Einige empirische Formeln und nummerische Modellierung zeigten, dass das Hangend nahezu vollständig zerklüftet und die Bedingungen für einen Einbruch gegeben waren. Vorentwässerung und Injektionsmaßnahmen wurden veranlasst. Der Grundwasserspiegel wurde mit 13 Entwässerungsbohrungen von der Oberfläche aus und mit 33, um die Erosionsrinne herum ausgeführten untertägigen Fächerbohrungen, abgesenkt. Die Bohrungen am Fuße der Erosionsrinnen waren für die Entwässerung wirksamer als die in den Flanken. Mit 25 Bohrungen von der Tagesoberfläche aus wurde am Fuß der sedimentgefüllten Erosionsrinne mit chemischen Injektionsmitteln eine Barriere errichtet. Feldbeobachtung des Grundwasserspiegels, des untertägigen Wasserzuflusses und die Hangendbewegung belegen die Wirksamkeit der Verfahrensweise und der getroffenen Maßnahmen.

Relevamiento y prevención de la irrupción de agua y arena asociada con la minería de carbón debajo de un sumidero enterrado lleno de agua: un caso de estudio

Resumen

La minería debajo de un sumidero enterrado relleno de agua implica un riesgo potencial de irrupción de agua y arena, especialmente si el lecho de rocas es delgado. El estudio de un caso se realizó en una mina de carbón china donde la capa superior estaba cubierta por sumideros ampliamente distribuidos. Varias formulas empíricas y modelos numéricos indicaron que el estrato de la cobertura estaba casi totalmente fractura y que estaban dadas todas las condiciones para una irrupción. Se iniciaron los desagotes pre-minería y la inyección de lechada. El nivel del agua subterránea se descendió a través de 13 pozos de bombeo de superficie y 33 agujeros subterráneos que se perforaron alrededor del barranco. Aquellos localizados en el fondo del sumidero fueron generalmente mejores en el desagote del acuífero que aquellos localizados en las orillas. Se construyó una barrera para impedir una irrupción de agua a través de la inyección de lechada en el fondo del sumidero enterrado a través de 25 agujeros desde la superficie. Las observaciones del nivel de agua, de la extensión del agua subterránea y del movimiento de la capa probaron la validez de los métodos de relevamiento y tratamiento.

Notes

Acknowledgements

We thank the National Natural Science Foundation of China (Grant 51504240), the National Key Basic Research Program of China (Grant 2015CB251600), Qing Lan Project (Grant Sujiaoshi (2016)15), the Fundamental Research Funds for the Central Universities (2017XKZD07), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) for their financial support. The authors are also grateful for the helpful comments provided by the anonymous reviewers and the journal’s editors.

Supplementary material

10230_2017_487_MOESM1_ESM.eps (41.7 mb)
Suppl. Figure 1. The sections of the target gully zone: (a) The top surface of sand cover and bedrock (EPS 42717 KB)
10230_2017_487_MOESM2_ESM.eps (71.1 mb)
Suppl. Figure 1. The sections of the target gully zone: (b) The surface relief of the buried gully (EPS 72790 KB)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Gangwei Fan
    • 1
    • 2
  • Dongsheng Zhang
    • 3
  • Shizhong Zhang
    • 2
  • Chengguo Zhang
    • 4
  1. 1.Key Laboratory of Deep Coal Resource Mining, Ministry of Education of ChinaChina University of Mining and TechnologyXuzhouChina
  2. 2.School of MinesChina University of Mining and TechnologyXuzhouChina
  3. 3.State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhouChina
  4. 4.School of Mining EngineeringUniversity of New South WalesSydneyAustralia

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