边坡失稳过程中的非饱和渗流与应力场耦合效应分析

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中图分类号：U418.55 文献标志码：A 文章编号：1003-5168（2025)16-0074-04

DOI:10.19968/j.cnki.hnkj.1003-5168.2025.16.015

Analysis of Unsaturated Seepage and Stress Field Coupling Effect During Slope Instability

DENG Jing (The 2nd Geological Brigade of Sichuan, Chengdu 61Oooo, China)

Abstract:[Purposes] Based on the slope engineering case of Guangyuan Expressway in Sichuan Province,this study investigates the coupling efects of unsaturated-saturated seepage and stress field induced by rainfallinfiltration.[Methods] Soil-water characteristics and mechanical parameters were obtained through pressure plate and triaxial tests.The coupling control equations were established based on Richards'equation and Bishop's effective stress principle,and numerical simulations were implemented using the FLAC2D/TP-Flow framework.[Findings] The wetting front advanced to 2.2 m following a t0.5 relationship with infiltration time,with peak pore water pressure reaching nearly 1O kPa.Matrix suction reduction caused a 22% stiffness attenuation,while plastic zone strain reached O.O15.The safety factor decreased from 1.45 to 1.O5.Post-drainage and bolt reinforcement interventions elevated the safety factor to 1.42, with 68% and 65% reductions in displacement and seepage pressure,respectively. [Conclusions]This study achieves dynamic analysis of soil-water-stresstri-field coupling,providing precise numerical foundations for slope stability evaluationand engineering mitigation in high-rainfallregions.

Keywords: unsaturated sepage-stresscoupling; stress field redistribution; slope stability; numerical simulation

0 引言

边坡稳定性受降雨入渗驱动的非饱和一饱和渗流与应力场动态耦合作用影响显著。（剩余7298字）