Abstract
A systematic method was developed to evaluate the risk of water inrush through a coal seam floor using the geographic information system (GIS) and the fuzzy set theory. The main geological and hydrogeological indicators that control water inrush were first considered using a fuzzy mathematics approach, in which fractal analysis was carried out to quantify the fault’s characteristics. The degree of membership was determined using GIS, the weight of every factor was considered by calculating the entropy in accordance with Shannon’s information entropy theory, and the level of risk of the evaluated object was derived using the maximum membership principle. The approach was validated by a case study at the Chensilou mine in Henan Province, China, where the aquifers that underlie an exploitable coal seam, II2, were made impermeable by grouting. Data from Nov. 2014 to April 2016 shows that the risk of water inrush was reduced in Panel 2517 of the II2 coal seam, that there were no serious disturbances in this panel and no groundwater inrush through the floor. This method can be a powerful tool for systematically assessing the risk of water inrush through the floor, since the influence of several factors can be quantitatively considered in accordance with the geological and mining conditions.
摘要
基于地理信息系统(GIS)和模糊集理论提出了一种煤层底板突水危险评估方法。采用分形法量化断层特征,模糊集方法识别控制煤层底板突水的地质和水文地质主控因素。采用GIS方法确定隶属度,Shannon信息熵法确定主控因素权重,最大隶属度原则评价底板突水风险水平。通过河南省永城陈四楼煤矿2517工作面工程案例验证了评估方法可行性,该工作面煤层底板含水层经过注浆加固。2014年11月至2016年4月数据显示2517综采工作面突水危险性低;实际开采过程亦没有发生底板突水。该方法能够量化地质及采矿等影响,为一种系统评价煤层底板突水危险的工具。
Zusammenfassung
Eine systematische Methode auf Basis von geografischen Informationssystemen (GIS) und Fuzzylogic-Theorie wurde entwickelt um das Risiko eines Wassereinbruchs durch den Grund einer Kohlenmine zu untersuchen. Die wichtigsten geologischen und hydrogeologischen den Wassereinbruch kontrollierenden Indikatoren wurden zuerst mit einem Fuzzy-Ansatz, in dem fraktale Analyse durchgeführt wurde, u geprüft , um die Eigenschaften der Störungen zu quantifizieren. Der Grad der Beteiligung wurde mit GIS bestimmt, die Wichtung jedes Faktors wurde durch die Berechnung der Entropie nach Shannon's Informationstheorie und die Gefahrenstufe jedes untersuchten Objekts wurde nach dem Maximum-Member-Prinzip abgeleitet. Der Ansatz wurde an einer Studie in der Chensilou Mine in der Henan Provinz, China, wo der Aquifer im Liegenden einer kohlebürtigen Schicht durch Verpressung abgedichtet wurde, validiert. Daten zwischen November 2014 und April 2016 zeigen, dass das Risiko eines Wassereinbruchs in Plattform 2517 des Flözes II2 reduziert wurde und dass keine ernsthaften Beeinträchtigungen auf dieser Ebene und keine Grundwasserzutritte durch die Sohle auftraten. Diese Methode kann ein mächtiges Werkzeug sein, um das Risiko eines Wassereinbruchs durch die Sohle systematisch zu beurteilen, da der Einfluss mehrerer Faktoren entsprechend den geologischen Verhältnissen und den Abbaubedingungen quantitativ berücksichtigt werden kann.
Resumen
Un método sistemático fue desarrollado para evaluar el riesgo de irrupción de agua a través de una veta de carbón en el piso usando información geográfica y la teoría de conjuntos difusos. Los principales indicadores geológicos y hidrogeológicos que controlan la irrupción de agua fueron considerados inicialmente usando una aproximación de matemáticas difusa, en la cual el análisis fractal fue utilizado para cuantificar las características de la falla. El grado de pertenencia fue obtenido usando GIS, el peso de cada factor fue considerado calculando la entropía en acuerdo con la teoría de Shannon y el nivel de riesgo del objeto evaluando fue derivada usando el principio de máxima pertenencia. La aproximación fue validada para un caso de estudio en la mina Chensilou en la provincia de Henan, China, donde los acuíferos que rodean una veta explotable de carbón, II2, se hicieron impermeables por cementación. Los datos desde Nov. 2014 hasta Abril 2016 muestran que el riesgo de irrupción de agua fue reducido en el panel 2517 de la veta II2, que no hubieron serios disturbios en este panel y que no hubo irrupción de agua subterránea a través del piso. Este método puede ser una herramienta efectiva para el relevamiento sistemático del riesgo de irrupción de agua a través del piso, ya que la influencia de varios factores puede ser cuantitativamente considerada en acuerdo con las condiciones geológicas y de explotación minera.
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Acknowledgements
The authors acknowledge the financial support from the National Natural Science Foundation of China under Grant 41472268, the 973 Program under Grant 2013CB227903, a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the 111 Project under Grant B14021.
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Yang, B., Sui, W. & Duan, L. Risk Assessment of Water Inrush in an Underground Coal Mine Based on GIS and Fuzzy Set Theory. Mine Water Environ 36, 617–627 (2017). https://doi.org/10.1007/s10230-017-0457-1
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DOI: https://doi.org/10.1007/s10230-017-0457-1