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Open AccessArticle

Constitutive Model of Stress-Dependent Seepage in Columnar Jointed Rock Mass

by Zihao Niu 1,2,*, Zhende Zhu 1,2 and Xiangcheng Que 1,2
1
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
2
Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(1), 160; https://doi.org/10.3390/sym12010160
Received: 12 December 2019 / Revised: 7 January 2020 / Accepted: 9 January 2020 / Published: 13 January 2020
Columnar jointed rock mass (CJRM) is a highly symmetrical natural fractured structure. As the rock mass of the dam foundation of the Baihetan Hydropower Station, the study of its permeability anisotropy is of great significance to engineering safety. Based on the theory of composite mechanics and Goodman’s joint superposition principle, the constitutive model of joints of CJRM is derived according to the Quadrangular prism, the Pentagonal prism and the Hexagonal prism model; combined with Singh’s research results on intermittent joint stress concentration, considering column deflection angles, the joint constitutive model of CJRM in three-dimensional space is established. For the CJRM in the Baihetan dam site area, the Quadrangular prism, the Pentagonal prism and the Hexagonal prism constitutive models were used to calculate the permeability coefficients of CJRM under different deflection angles. The permeability anisotropy characteristics of the three models were compared and verified by numerical simulation results. The results show that the calculation results of the Pentagonal prism model are in good agreement with the numerical simulation results. The variation of permeability coefficient under different confining pressures is compared, and the relationship between permeability coefficient and confining pressure is obtained, which accords with the negative exponential function and conforms to the general rule of joint seepage. View Full-Text
Keywords: columnar jointed rock mass; permeability; stress-dependent; pentagonal prism columnar jointed rock mass; permeability; stress-dependent; pentagonal prism
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Niu, Z.; Zhu, Z.; Que, X. Constitutive Model of Stress-Dependent Seepage in Columnar Jointed Rock Mass. Symmetry 2020, 12, 160.

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