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Study on the Height of the Mining-Induced Water-Conducting Fracture Zone Under the Q2l Loess Cover of the Jurassic Coal Seam in Northern Shaanxi, China

Studie zur Höhe der Bergbau-induzierten, wasserführenden Störungszone unter der Q2l Lössbedeckung des Jurassischen Kohleflözes im nördlichen Shaanxi, China

Estudio sobre la altura de la zona de fractura conductora de agua inducida por la minería bajo la cubierta de loess Q2l de la veta de carbón jurásico en el norte de Shaanxi, China

陕北Q2l黄土盖层下侏罗系煤层导水裂隙带高度研究(中国)

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Abstract

A method to calculate the height of a water-conducting fractured zone (HWCFZ) was developed based on the plate and shell theory, and the development of the HWCFZ in bedrock and Q2l loess strata is discussed in detail. First, the subsidence-deflection curve equation of the overlying stratum is theoretically derived, and then the ultimate deflection and free space height of rock strata are calculated. Moreover, the strata tensile strain is calculated by using integral calculus. In addition, the failure state of the rock is analyzed by comparing the theoretically calculated tensile strain with the experimentally measured yield tensile strain, allowing one to attain the maximum value of HWCFZ. This approach was tested at the Jinjitan coal mine; the theoretically predicted, experimentally measured, and numerically computed maximum HWCFZ values were 189.5, 187.3, and 188.5 m, respectively, demonstrating the accuracy of the proposed method. These results are highly significant for safe and environment-friendly coal mining in northwest Shaanxi, China.

Zusammenfassung

Es wurde eine Methode zur Berechnung der Höhe einer Bergbau-induzierten, wasserführenden Störungszone (HWCFZ) entwickelt, basierend auf der Plate-Shell-Theorie. Außerdem wird die Entwicklung der HWCFZ im Muttergestein und in Q2l-Löss-Schichten detailliert diskutiert. Zunächst wurde die Gleichung für die Absenkungs-Auslenkungskurve der Deckschichten theoretisch abgeleitet. Anschließend wurden die finale Auslenkung und die Höhe der Hohlräume im Fels berechnet. Durch Integration wurde außerdem die Zugdehnung der Schichten berechnet. Ferner wurde durch Vergleich der theoretisch berechneten Zugdehnung mit der experimentell gemessenen Zugdehnung der Bruchzustand des Gesteins analysiert. Das erlaubt die Ermittlung des Maximums der HWCFZ. Dieser Ansatz wurde für das Jinjitan Kohlebergwerg getestet. Die Werte für theoretisch vorhergesagte, experimentell ermittelte und numerisch berechnete maximale HWCFZ betrugen 189.5, 187.3 bzw. 188.5 m. Das zeigt die Genauigkeit der vorgeschlagenen Methode. Diese Ergebnisse sind für den sicheren und umweltfreundlichen Kohleabbau in Nordwest-Shaanxi (China) sehr wichtig.

Resumen

Se desarrolló un método para calcular la altura de una zona fracturada conductora de agua (HWCFZ) basado en la teoría de las placas y las láminas; se discute en detalle, el desarrollo de la HWCFZ en el lecho rocoso y los estratos de loess Q2l. En primer lugar, la ecuación de la curva de subsidencia-deflexión del estrato suprayacente se derivó teóricamente y luego se calculó la deflexión final y la altura del espacio libre de los estratos de roca. Además, mediante el cálculo integral, se calculó la deformación por tracción de los estratos. Se analizó el estado de falla de la roca comparando la tensión de tensión calculada teóricamente con la tensión de tensión de rendimiento medida experimentalmente, lo que permite alcanzar el valor máximo de HWCFZ. Este enfoque fue probado en la mina de carbón Jinjitan; los valores máximos de HWCFZ teóricamente predichos, medidos experimentalmente y calculados numéricamente fueron 189,5, 187,3 y 188,5 m, respectivamente, lo que demuestra la precisión del método propuesto. Estos resultados son altamente significativos para la minería del carbón segura y cuidadosa del medio ambiente en el noroeste de Shaanxi, China.

抽象

在板壳理论基础上,提出一种导水裂隙带高度(HWCFZ)计算方法,讨论了导水裂隙带在基岩和Q2l黄土中的发展。首先,从理论上推导出上覆岩层的沉降-挠度曲线方程;然后,计算岩层的极限挠度和自由空间高度。用积分法计算岩层的拉应变。此外,通过拉伸应变的理论计算值与拉伸屈服应变的实测值对比,分析岩层破断状态,得到最大导水裂隙带高度(HWCFZ)。该方法被应用于金鸡滩煤矿,导水裂隙带高度的理论预测值、实测值和数值计算结果分别为189.5 m、187.3 m和188.5 m,验证了该预测方法的准确性。研究对实现陕北地区安全、环境友好型煤炭开采具有重要意义。

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Acknowledgements

The study was jointly supported by the State Key Program of the National Natural Science Foundation of China (Grant 41430643) and the National Basic Research 973 Program of China (Grant 2015CB251601).

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Authors and Affiliations

  1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Tingen Zhu, Wenping Li, Qiqing Wang, Yanbo Hu, Kaifang Fan & Jiafa Du

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  1. Tingen Zhu
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  2. Wenping Li
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  3. Qiqing Wang
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  4. Yanbo Hu
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Correspondence to Wenping Li.

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Zhu, T., Li, W., Wang, Q. et al. Study on the Height of the Mining-Induced Water-Conducting Fracture Zone Under the Q2l Loess Cover of the Jurassic Coal Seam in Northern Shaanxi, China. Mine Water Environ 39, 57–67 (2020). https://doi.org/10.1007/s10230-020-00656-z

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