To research the failure mechanism and failure modes of some double-sided slopes, the two-dimensional particle flow code (PFC2D) and shaking table tests are utilised in this paper to study the mechanism of double-sided slopes failure. The results reveal that under seismic loads, the failure modes of slopes with varying moisture content varies. Shattering-shallow slip failure occurs on slopes with 5% moisture content, tension-shear slip failure occurs on slopes with 8% moisture content, and shattering-collapse slip failure occurs on slopes with 12% moisture content. The failure mechanism of slopes with varying water content varies. The slope with 5% moisture content causes tensile fractures on the upper surface of the slope in the initial stage of vibration, and local shear slip occurs at the foot of the slope and grows rapidly, then it converts to tensile failure. Local shear cracks form first on the slope with 8% moisture content, and subsequently they unite to form a slip plane, making the slope unstable. Under shear action, it first creates a fracture network in the slope with a moisture content of 12 percent, then uneven dislocation occurs in the slope during vibration, and eventually the entire instability failure occurs. In the case of low moisture content, the tensile crack is the primary cause of slope failure. However, as the moisture level increases, the influence of shear failure increases.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P.R., China.
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