Experimental and Numerical Validation of an Effective Stress-Sensitive Permeability Model Under Hydromechanical Interactions

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Transport in Porous Media Pub Date : 2024-01-02 DOI:10.1007/s11242-023-02043-y
Teng Teng, Zhaolong Li, Yuming Wang, Kun Liu, Wenjian Jia
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Abstract

Water seepage in rocks, in geotechnical engineering such as the hydrofracturing of hard rocks, excavation of underground chambers, and prevention of mine water disasters, is a common problem. According to rock mechanics theory, the deformation and stress of rocks influence seepage behavior. In this study, a modified permeability model of argillaceous sandstone under coupled hydromechanical conditions was established to reveal the relationship between permeability and effective stress, including external stress and internal water pressure. The modeling results indicate a negative exponential relationship between the argillaceous sandstone permeability and the effective stress. The proposed effective stress-sensitive permeability model was validated by conducting two sets of seepage experiments based on controlling the water pressure and external stress, with the results obtained considered satisfactory. Based on the proposed permeability model, a fully coupled multifield model of the water seepage and rock deformation was developed. Fully coupled scenario-based numerical simulations were conducted in a finite element environment to investigate water seepage evolution and rock deformation. The experimental and numerical results show that the trends in the evolution of the entire compressive stress–strain and permeability curves are reversed, and the maximum value of the permeability was not consistent with the failure of argillaceous sandstone. This model and corresponding numerical simulations can provide insights for water seepage research and serve as a reliable theoretical basis for evaluating roof water injection and hydraulic fracturing in rock and mining engineering.

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水力机械相互作用下有效应力敏感渗透模型的实验和数值验证
岩石渗水是岩土工程中的一个常见问题,如坚硬岩石的水力压裂、地下洞室的开挖和矿井水灾害的防治等。根据岩石力学理论,岩石的变形和应力会影响渗流行为。本研究建立了水力机械耦合条件下霰砂岩的修正渗透率模型,以揭示渗透率与有效应力(包括外应力和内水压)之间的关系。建模结果表明,霰质砂岩渗透率与有效应力之间呈负指数关系。在控制水压和外应力的基础上进行了两组渗流实验,对所提出的有效应力敏感渗透率模型进行了验证,结果令人满意。基于所提出的渗透率模型,建立了渗水和岩石变形的全耦合多场模型。在有限元环境中进行了基于情景的全耦合数值模拟,以研究渗水演化和岩石变形。实验和数值结果表明,整个压应力-应变曲线和渗透率曲线的演变趋势是相反的,渗透率的最大值与霰质砂岩的破坏不一致。该模型及相应的数值模拟可为渗水研究提供启示,并可作为岩石和采矿工程中评价顶板注水和水力压裂的可靠理论依据。
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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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