Abstract
Fractured rock masses are rich in discontinuous surfaces, such as joints and fissures, and therefore, rock slopes have complex mechanical properties and unsaturated permeability under rainfall conditions. In this paper, a discrete fractured slope of an unsaturated rock mass is studied. First, the coupled equations of seepage, stress and damage in three states under unsaturated conditions were derived. Then, the right bank slope of the Shanshui Reservoir in the eastern new district of Yiyang, Hunan Province, was taken as an example. The connected fracture network generated by MATLAB was introduced into COMSOL Multiphysics, and a coupled model of a discrete fracture unsaturated seepage–stress–damage field was established. Second, the PDE module of COMSOL finite element software was developed to solve and validate the three-field coupled model. The changes in different physical fields under different working conditions were compared and analyzed, leading researchers to determine that hydrodynamic pressure and shear stress influence the coupled model. Finally, the slope stability was evaluated using reliability, the weights of different random variables on slope stability were analyzed, and it was concluded that cohesion and the internal friction angle have greater and smaller impacts, respectively, providing a more accurate risk assessment of unsaturated rock slope stability.
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Acknowledgements
This work was conducted with supports from the National Natural Science Foundation of China (Grant Nos. U1602232 and 51474050), the Fundamental Research Funds for the Central Universities (Grant No. N170108029); Doctoral Scientific Research Foundation of Liaoning Province (Grant Nos. 20170540304; 20170520341); the research and development project of China construction stock technology (Grant No. CSCEC-2016-Z-20-8).
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Wang, Sh., Yang, Tj., Zhang, Z. et al. Unsaturated seepage–stress–damage coupling and dynamic analysis of stability on discrete fractured rock slope. Environ Earth Sci 80, 660 (2021). https://doi.org/10.1007/s12665-021-09647-x
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DOI: https://doi.org/10.1007/s12665-021-09647-x