3:30 PM - 5:00 PM
[HDS05-P11] Numerical Modeling on the Maximum Strain of Rock Slopes at Collapse with Various Weak Planes Orientations
Keywords:Large-scale landslide, weak plane, strain, distinct element method
The large-scale landslide is commonly deep-seated failure. As a result, the failure mode of such slope is strongly related to the weak planes of the rock mass. The deformation behavior of a rock slope depends on the relative orientation between weak planes and the slope face. In the study, the finite element method software PLAXIS 3D and the distinct element method software EDEM was used to calculate the factor of safety, the sliding surface and the deformation of slopes. The maximum strains of slopes with different orientations of weak planes will be discussed. The slope angle is 30 degrees with four orientations of weak planes, which are cataclinal and anaclinal slopes with weak planes of 30 degrees and 60 degrees. The Jointed Rock model with overall Mohr-Coulomb failure criterion in PLAXIS 3D was used to define the behavior of the slope material and the weak planes. Then the factor of safety and the sliding surface are obtained by means of the strength reduction method. The strength parameters of the slope material and the weak planes are adjusted to make the factors of safety of the four slopes the same so that they have similar initial overall strength. Next, the slope model with the corresponding sliding surface is established in EDEM. The micro-parameters in EDEM and the macro-parameters in PLAXIS 3D are correlated by means of numerical simple shear tests. The slope material strength is reduced step by step, leading to large deformation and collapse. The maximum strains of the slopes at collapse are calculated and compared. It is expected that anaclinal slopes yield larger maximum strains than cataclinal slopes. The results are helpful for the classification of large-scale landslide susceptibility.