Abstract
Water–sand mixture inrushes into shallow underground workings have caused casualties and property loss. A coupled fluid–solid analog model was developed to simulate the water–sand mixture inrush processes during mining from fracture production and development, based on the hydrogeological conditions at the #22304 working face of the Shigetai coal mine in the Erdos coal basin of northeast China. The deformation characteristics of the overlying strata and water pressure variations within the water-flowing fractured zone were monitored and analyzed. The results show that the water–sand mixture inrush consists of three stages: development of cracks in the overlying strata, initiation of a water inrush channel, and evolution of the inrush channel. The stresses of the overlying strata, water pressures, and permeability characteristics of water and sand inrush pathways change within the three stages. These findings lay a solid foundation for predicting water–sand mixture inrushes in shallow coal mines.
抽象的
浅埋煤层工作面的水沙突溃已造成人员伤亡和财产损失。依据中国东北鄂尔多斯聚煤盆地石圪台煤矿#22304工作面的水文地质条件, 建立了流-固耦合模拟模型, 模拟开采期间裂隙产生和扩展而诱发水沙混合物突溃的过程。监测和分析了上覆地层的变形特征和导水裂隙带的水压变化。结果表明, 水沙混合物的突溃包括三个阶段: 上覆地层裂缝发展、突水通道生成和突水通道演化。上覆地层应力、水压和水沙突出通道渗透性随三个阶段而变化。研究为预测浅埋煤层水沙混合突溃奠定了坚实基础。
Resumen
Las irrupciones de mezclas de agua y arena en las explotaciones subterráneas poco profundas han causado víctimas y pérdidas materiales. Se ha desarrollado un modelo analógico con acoplamiento fluido-sólido para simular los procesos de irrupción de la mezcla de agua y arena durante la explotación minera a partir de la producción y el desarrollo de fracturas, basándose en las condiciones hidrogeológicas del frente de trabajo #22304 de la mina de carbón de Shigetai en la cuenca de carbón de Erdos, en el noreste de China. Se monitorizaron y analizaron las características de deformación de los estratos suprayacentes y las variaciones de la presión del agua dentro de la zona fracturada por el flujo de agua. Los resultados muestran que la irrupción de la mezcla de agua y arena consta de tres etapas: desarrollo de grietas en los estratos suprayacentes, inicio de un canal de irrupción de agua y evolución del canal de irrupción. Las tensiones de los estratos suprayacentes, las presiones del agua y las características de permeabilidad de los canales de irrupción de agua y arena cambian dentro de las tres etapas. Estos resultados sientan una base sólida para predecir las irrupciones de mezclas de agua y arena en minas de carbón poco profundas.
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Acknowledgements
This research was financially supported by China’s National Natural Science Foundation (grants 42072284, 42027801), Fundamental Research Funds for the Central Universities (grant 3142017064), and the Open Fund of the Hebei State Key Laboratory of Mine Disaster Prevention (grant KJZH2016K01).
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Zeng, Y., Lian, H., Du, X. et al. An Analog Model Study on Water–Sand Mixture Inrush Mechanisms During the Mining of Shallow Coal Seams. Mine Water Environ 41, 428–436 (2022). https://doi.org/10.1007/s10230-022-00870-x
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DOI: https://doi.org/10.1007/s10230-022-00870-x