Experimental Study of Non-Darcian Flow Characteristics in Low-Permeability Coal Pillar Dams.

Ground water Pub Date : 2024-11-01 Epub Date: 2024-03-11 DOI:10.1111/gwat.13401
Xu Li, Peng Zhu, Konghui Zuo, Zhang Wen, Qi Zhu, Qiang Guo, Hamza Jakada
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Abstract

The safe operation of underground reservoirs and environmental protection heavily rely on the water flow through coal pillar dams in coal mines. Meanwhile, research on the flow characteristics in coal pillar dams has been limited due to their low hydraulic conductivity. To address this gap, this study assembled a novel seepage experimental device and conducted a series of carefully designed seepage experiments to examine the characteristics of low-permeability in coal pillar dams. The experiments aim to explore the relationship between water flux and hydraulic gradient, considering varying core lengths and immersion times. Flow parameters were determined by fitting observed flux-gradient curves with predictions from both Darcy and non-Darcian laws. Several significant results were obtained. First, a noticeable non-linear relationship between water flux and hydraulic gradient was observed, particularly evident at low flow velocities. Second, the non-Darcy laws effectively interpreted the experimental data, with threshold pressure gradients ranging 13.60 to 58.64 for different core lengths. Third, the study established that water immersion significantly affects the flow characteristics of coal pillar dams, resulting in an increased hydraulic conductivity and flow velocity. These findings carry significant implications for the design of coal pillar dams within underground coal mine reservoirs, providing insights for constructing more stable structures and ensuring environmental protection.

低渗透性煤柱坝中的非达西流特性试验研究
地下水库的安全运行和环境保护在很大程度上依赖于煤矿中通过煤柱坝的水流。同时,由于煤柱坝的导水性较低,对其水流特性的研究一直很有限。针对这一空白,本研究组装了新型渗流实验装置,并进行了一系列精心设计的渗流实验,以研究煤柱坝的低渗透特性。实验旨在探索水流量与水力坡度之间的关系,同时考虑到不同的岩心长度和浸泡时间。通过将观测到的通量-梯度曲线与达西定律和非达西定律的预测值进行拟合,确定了水流参数。得出了几项重要结果。首先,观察到水流量与水力梯度之间存在明显的非线性关系,在低流速时尤为明显。其次,非达西定律有效地解释了实验数据,不同岩心长度的阈值压力梯度从 13.60 到 58.64 不等。第三,研究证实,水浸会显著影响煤柱坝的流动特性,导致水导率和流速增加。这些发现对煤矿地下水库中煤柱坝的设计具有重要意义,为建造更稳定的结构和确保环境保护提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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