Stability Analysis of Granite Residual Soil Tower Foundation Slope Under Rainfall Condition
MAO Qiang
GUO Kai
ZHOU Quan
XU Jianwen
Abstract：Granite residual soils are widely distributed in Guangdong Province,China,exhibiting unique engi-neering properties that significantly influence slope stability.This study focuses on a tower-foundation slope com-posed of granite residual soil in Guangdong,where the strength reduction method in Midas GTS/NX was employed to simulate slope stability under extreme rainfall conditions.Numerical simulations revealed that the safety factor of the slope decreased to 0.985 under extreme rainfall,indicating significant stability degradation.Laboratory permea-bility tests demonstrated that the second soil layer possesses a relatively high permeability coefficient.Subsequent seepage-stress coupling analysis further revealed that this layer preferentially forms dominant seepage channels,inducing increased permeability and pore water pressure in the underlying soil.Meanwhile,the combined effects of tower-foundation loading and seepage-induced water pressure generated stress concentration and throughgoing plas-tic zones in the mid-lower slope,ultimately triggering instability mechanisms.This study elucidates the spatiotem-poral coupling mechanisms between rainfall-induced seepage path evolution and stress field responses,particularly identifying the critical safety threshold for the slope toe region under synergistic load-seepage interactions.The find-ings provide a novel analytical framework for stability assessment and mitigation design of granite residual soil slopes under similar geological conditions.
Keywords：Granite residual soilTower foundation slopeStrength reduction methodSlope stability
Publication Date：2025-12-30
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：7( 98-104 )