Abstract
In this paper, the Barton-Bandis model was used to develop a theoretical estimate that accounts for the hydro-mechanical coupling in a fracture considering shear dilation under 3D compression and a shear stress. The axial stresses and the shear stress, as well as the seepage pressure and roughness characteristics of the fracture, were taken into consideration. Based on the properties of the sandstone of the Xinglong Tunnel in Chongqing, China, the COMSOL™ software was used to implement the hydro-mechanical coupling model of a horizontal rough single fracture under the action of 3D compression and a shear stress. The results of shear-seepage tests performed in a multi-field coupled triaxial apparatus were used to corroborate the applicability of the model. Finally, by establishing numerical models of rough single fractures with different inclination angles, the seepage and mechanical characteristics of rough fractures under different stresses and seepage pressures were analyzed, and the influence of degree of different fracture inclination angles on peak shear stress, normal displacement, permeability, and flow velocity was quantified. On this basis, the rough single fracture permeability with different inclination angles was derived as a function of the stress state. The results obtained contribute to understanding the hydro-mechanical coupling characteristics in rough fractures with different inclination angles under 3D compressive and a shear stress due to the difficulty of performing true triaxial experiments in a rock mass with inclined rough fractures.
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This work was supported by the National Natural Science Foundation of China (Grant No. U1602232), the Liaoning Province Science and Technology Plan, China (2019JH2-10100035), the Fundamental Research Funds for the Central Universities (N170108029), the fundamental research funds for the central universities (Grant No. 2101018), and the China Scholarship Council (CSC No. 201906080071) for a joint Ph.D. fellowship, which enabled Tianjiao Yang to visit the Environmental Geomechanics Laboratory, the Department of Civil Engineering and Applied Mechanics, McGill University, Canada.
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Tianjiao Yang: conceptualization, methodology, experiment, software, visualization, writing–original draft. A. P. S. Selvadurai: conceptualization, writing, correcting the research approach, extensive review and editing. Pengyu Wang: formal analysis, experiment, software, writing–review and editing, funding acquisition. Shuhong Wang: formal analysis, funding acquisition. Huan Liu: methodology, writing–review and editing.
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Yang, T., Selvadurai, P., Wang, P. et al. Hydro-mechanical coupling of rough fractures that exhibit dilatancy phenomena. Bull Eng Geol Environ 81, 433 (2022). https://doi.org/10.1007/s10064-022-02883-w
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DOI: https://doi.org/10.1007/s10064-022-02883-w