Experimental study on permeability response in fractured rock to the effect of hydro-mechanical coupling, fracture geome
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Experimental study on permeability response in fractured rock to the effect of hydro‑mechanical coupling, fracture geometry, and component content Tong Zhang1,2 · Xiang He2 · Yang Liu1,2 · Yixin Zhao2 · Ke Yang1 · Xiang Yu1,2 Received: 2 January 2020 / Accepted: 28 September 2020 © Springer Nature B.V. 2020
Abstract The conductivity of fractured rock mass caused by the hydro-mechanical behavior and attributes of the rock is critical for fluid seepage and solute diffusion. To study the evolution of fluid conductivity in fractured rock mass, by considering the hydro-mechanical coupling effect, fracture geometry, and component content, triaxial coupling and water–adsorption experiments were conducted. The results show that an increase in permeability is positively related to hydraulic pressure and negatively related to confining and axial stress. The conductivity of fractured rock mass is closely related to fracture morphology and component content. Compared with the dynamic hydraulic pressure dependence of permeability for dual-fracture sandstone, a dynamic confining stress dependence and history memory effect of permeability was observed in single-fracture sandstone, whereas the dynamic confining stress dependence of permeability for single-fracture sandy mudstone was observed, and dynamic hydraulic pressure dependence and history memory effect permeability for multi-fracture sandy mudstone and intact sandy mudstone was presented. Furthermore, the permeability of single-fracture sandy mudstone is two orders of magnitude more than that of multi-fracture and intact sandy mudstone. The integrated effect of hydro-mechanical coupling, fracture morphology, and component content on the conductivity is characterized by confining stress-dependent history memory indexes of 0.04e-17, 0.125e-19, and 0.2e-19 for single-fracture, multi-fracture, and intact sandy mudstone, respectively. Keywords Fluid conductivity · Fractured rock mass · History memory effect · Hydromechanical coupling effect
* Tong Zhang [email protected] 1
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2
Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology, Beijing 100083, China
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Natural Hazards
1 Introduction Understanding the response of hydrogeology to underground activities directly related to rock mass, fluid, and geological structures is critical for environment protection and engineering safety; therefore, this topic has attracted the attention of researchers and engineers in unconventional resource exploration, urban construction (Simmons et al. 2001;Berkowitz 2002; Chen et al. 2019; Zhang et al. 2020a, b), contamination disposal of radioactive waste, and CO2 sequestration (Zhang et al. 2020c; White et al. 2005). Structural properties of rock mass characterized by pore radius, pore throat size, pore connectivity, and structure geome
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