Simulation of Groundwater Flow Field of Coal Mine Based on Subdomain-Analytic Element Method

被引：0
|
作者：
Ren X. [1 ,2 ]
Wu Q. [1 ,2 ]
Wu R. [3 ]
Liu S. [1 ,2 ]
机构：
[1] College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing
[2] National Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing
[3] Coal Geological Survey Institute of Hebei Province, Xingtai
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 08期
关键词：
Complex potential; Hydrogeology; Line-sink; Nonlinear density distribution; !text type='Python']Python[!/text; Subdomain-analytic element method;
D O I：
10.3799/dqkx.2020.389
中图分类号：
学科分类号：
摘要：
In order to analyze the feasibility of applying the subdomain-analytic element method to the simulation of coal mine groundwater flow field, and to explore how to improve the simulation accuracy of this method, complex potential expression of nonlinear density distribution high-order line-sink of analytic element method was derived independently here, and spatial distribution characteristics of values of discharge potential and stream function on line-sink were analyzed. On the basis of that, the flow field model of coal mine was constructed with python language based on subdomains-analytic element method which was used for solving a problem concerning the distribution of head in a coal mine after drainage test. According to the simulation results, the absolute value of the deviation between the simulated heads and the heads of the observation holes ranges from 1.36 m to 5.27 m, and the heads on the outer boundaries of the model (actual constant head boundaries) are close to the actual value (900 m), and the flow rates passing through the outer boundaries of the model (actual impermeable boundaries) approximate zero. The analysis of the simulation principle and simulation results show that the coal mine groundwater flow field model based on the subdomain-analytic element method satisfies the conservation of mass and the gradient field of Darcy flow in the whole area, and the head at any point in the whole area can be determined using the discharge potential function of the subdomain where the point is located in. Therefore, it is feasible to apply the subdomain-analytic element method to simulate the groundwater flow field of coal mine; and the nonlinear density distribution line-sinks representing the model boundaries can be divided into shorter lengths to further improve the accuracy of the simulation. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：3019 / 3027
页数：8
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