Experimental Determination of Poroperm Properties of Fractured Porous Geomaterials within the Framework of Dual-Permeability Model

IF 0.7 4区工程技术 Q4 MINING & MINERAL PROCESSING

Journal of Mining Science Pub Date : 2023-11-29 DOI:10.1134/s1062739123040026

L. A. Nazarov, N. A. Golikov, A. A. Skulkin, L. A. Nazarova

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Abstract

The experimental procedure is developed and tested on a laboratory scale and using layered samples of manmade geomaterials. Within the dual-permeability model, the procedure enables determining parameters that govern fluid flow and poroelastic deformation in fractured porous rock masses, namely, fracture permeability \(k_1\) and mass transfer coefficient \(\beta\), as well as their dependence on stresses \(\sigma\). The testing procedure is proposed and implemented. In the procedure, under the stepwise increasing normal stress \(\sigma\), the stationary flow rates \(Q_1(\sigma)\) and \(Q_2(\sigma)\) are measured in a quasiregular fractured porous sample at the preset pressure difference: using a standard setup (\(Q_1\)) and in closed end-face fractures (\(Q_2\)). The mathematical model of the experiment is constructed, and the analytical solution of the problem on stationary flow is obtained: pressure patterns in fractures, and stress-dependence of flow rates. The experimental data interpretation algorithm enables calculating \(k_1\) and \(\beta\) by the recorded flow rates \(Q_1\) and \(Q_2\). It is shown that the permeability \(k_1\) is proportional to \(\sigma^{-2}\), and \(\beta\) remains almost unchanged.

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双渗模型框架下裂缝性多孔土工材料孔隙特性的实验研究

摘要本实验方法是在实验室规模和人造土工材料分层样品上开发和测试的。在双渗透模型中，该程序能够确定控制裂隙多孔岩体中流体流动和孔隙弹性变形的参数，即裂缝渗透率\(k_1\)和传质系数\(\beta\)，以及它们对应力的依赖\(\sigma\)。提出并实施了测试程序。在逐步增加的法向应力\(\sigma\)下，采用标准装置(\(Q_1\))和封闭端面裂缝(\(Q_2\))在预设压差下测量准规则裂缝多孔样品中的固定流速\(Q_1(\sigma)\)和\(Q_2(\sigma)\)。建立了实验的数学模型，得到了稳态流动问题的解析解:裂缝内的压力分布，以及流量的应力依赖性。实验数据解释算法可以通过记录的流量\(Q_1\)和\(Q_2\)计算\(k_1\)和\(\beta\)。结果表明，渗透率\(k_1\)与\(\sigma^{-2}\)成正比，\(\beta\)基本保持不变。

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来源期刊

Journal of Mining Science 工程技术-矿业与矿物加工

CiteScore

1.70

自引率

25.00%

发文量

审稿时长

24 months

期刊介绍： The Journal reflects the current trends of development in fundamental and applied mining sciences. It publishes original articles on geomechanics and geoinformation science, investigation of relationships between global geodynamic processes and man-induced disasters, physical and mathematical modeling of rheological and wave processes in multiphase structural geological media, rock failure, analysis and synthesis of mechanisms, automatic machines, and robots, science of mining machines, creation of resource-saving and ecologically safe technologies of mineral mining, mine aerology and mine thermal physics, coal seam degassing, mechanisms for origination of spontaneous fires and methods for their extinction, mineral dressing, and bowel exploitation.