NUMERICAL ANALYSIS OF SEEPAGE CHARACTERISTICS AND STABILITY FOR SPHEROIDAL WEATHERED GRANITE-LIKE SOIL SLOPES UNDER RAINFALL CONDITIONS

As the most common cause of slope instability damage,rainfall has more complex influence characteristics in spheroidal weathered granite-type soil slopes with significant non-homogeneity and discontinuity characteristics. Based on ABAQUS and its secondary development,a study on the seepage characteristics and stability of spheroidal weathered granitic soil slopes under rainfall conditions was carried out by constructing a seepage model for spheroidal weathered granitic soil slopes and considering the influence of rainfall parameters. The results of the study show that the shallow soil of the slope is saturated more quickly under the influence of the spherical weathering body. The saturation rate is also controlled by the depth of burial of the weathering body,the cross-sectional area and content of the "rain-facing" surface. The potential sliding surfaces of the spherical weathering granite-like soil slope under rainfall conditions still show a significant complex diversity,and there are similar sliding surfaces to those in the rain-free state. The slope safety factor is negatively correlated with rainfall duration and intensity,and tends to level off as rainfall continues,but can also lose its leveling off trend and continue to decrease under the influence of spheroidal weathering bodies. Among the rainfall types,the gradual incremental type has the greatest influence on slope stability. The results of the study can provide a scientific basis for evaluating the stability of spherically weathered granite-like soil slopes under rainfall conditions.