Failure characteristics of bank slopes in hydro-fluctuation belt of the Three Gorges Reservoir Area based on DDA hydro-mechanical coupling " />
slope engineering,hydro-fluctuation belt of the Three Gorges Reservoir Area,discontinuous deformation analysis (DDA),hydro-mechanical coupling,DFN-Voronoi block discretization method,failure characteristics
Failure characteristics of bank slopes in hydro-fluctuation belt of the Three Gorges Reservoir Area based on DDA hydro-mechanical coupling
WANG Linfeng1, 2, CAI Bo1, XIE Mingjun1, TANG Ning1, YANG Zhizhong1
(1. Key Laboratory of Mountainous Area Highway Transportation and Transportation Geological Disaster Reduction in University of Chongqing, Chongqing Jiaotong University, Chongqing 400074, China; 2. Key Laboratory of Geological Hazards on Three
Gorges Reservoir Area, Ministry of Education，China Three Gorges University, Yichang, Hubei 443002, China)
Abstract：Rainfall and changes in reservoir water levels are two key drivers of degradation in the hydro-fluctuation belt. This study aims to elucidate the damage evolution mechanism and the primary control modes of bank slopes within the hydro-fluctuation belt of the Three Gorges Reservoir area under typical conditions of rainfall and reservoir level fluctuations. By enhancing the accuracy of analysis and numerical simulation of bank slope stability in the reservoir area, this research holds significant value for guiding stability assessments of bank slopes in the region.
Initially, the water pressure loading sub-matrix is derived from the equations of discontinuous deformation analysis (DDA), and a novel method of DFN-Voronoi block discretization is proposed based on the discrete fracture network (DFN). Subsequently, a simulation analysis of the damage characteristics of the hydro-fluctuation belt—considering conditions of short-term heavy rainfall (45 mm/h) and reservoir water level decline—is conducted using the DDA hydro-mechanical coupling method, exemplified by the No. 6 slope of Qingshi. Through the DFN-Voronoi block discrete DDA coupled hydro-mechanical calculation method, the evolution mechanism and characteristic patterns of bank slope damage in hydro-fluctuation belts under varying conditions are systematically revealed. This is achieved by simulating the deformation of discontinuous media, the dynamic coupling of seepage and stress, and the visualization of multi-stage damage patterns. The results indicate that during uniaxial compression simulations across different fracture types, the proposed DFN-Voronoi model achieves a reduction in maximum displacement errors of 17% and 13%, respectively, compared to the traditional Voronoi model, effectively preventing unreasonable damage surfaces resulting from stochastic discretization. In case simulation analyses, under a working condition of 45 mm/h rainfall, the continuous accumulation of hydro-mechanical coupling leads to gradual degradation of the hydro-fluctuation belt. This iWANG Linfeng1, 2, CAI Bo1, XIE Mingjun1, TANG Ning1, YANG Zhizhong1
s specifically manifested as bending and collapse of the leading edge due to flexural shear damage, alongside pushing and pulling crack damage at the trailing edge. As the reservoir water level gradually declines, discrete blocks on the slope surface become destabilized and roll down, exacerbating tension-slip damage at the trailing edge. This latter form of damage emerges as the predominant type affecting bank slopes in the hydro-fluctuation belt during periods of reservoir water decline. Based on the DDA hydro-mechanical coupling analysis, this study reveals the damage patterns of bank slopes in the hydro-fluctuation belt of the Three Gorges Reservoir area under classical working conditions. The findings can provide numerical tools and reference values for evaluating the stability of bank slopes in the hydro-fluctuation belt and for managing reinforcement efforts in phases.
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2025, Vol. 44 
