摘要
【目的】依托四川广元高速公路边坡工程,针对降雨入渗引起的非饱和-饱和渗流与应力场耦合效应进行研究。【方法】通过压力板与三轴试验获取土-水特征及力学参数,基于Richards方程和Bishop有效应力构建耦合控制方程,采用FLAC2D/TP-Flow框架实现数值模拟。【结果】湿润前缘随入渗时间按t0.5规律扩展至2.2 m,孔隙水压力峰值近10 kPa,基质吸力下降导致刚度衰减22%,塑性区应变达0.015,安全系数由1.45降至1.05。排水与锚杆加固后安全系数提升至1.42,位移与渗压分别下降68%与65%。【结论】研究实现了土-水-力三场耦合动态分析,为高降雨区边坡稳定性评估与工程防治提供了精准数据依据。
[Purposes]Based on the slope engineering case of Guangyuan Expressway in Sichuan Prov-ince,this study investigates the coupling effects of unsaturated-saturated seepage and stress field in-duced by rainfall infiltration.[Methods]Soil-water characteristics and mechanical parameters were ob-tained 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 10 kPa.Matrix suction reduction caused a 22%stiffness attenuation,while plastic zone strain reached 0.015.The safety factor decreased from 1.45 to 1.05.Post-drainage and bolt reinforcement interventions elevated the safety fac-tor to 1.42,with 68%and 65%reductions in displacement and seepage pressure,respectively.[Conclu-sions]This study achieves dynamic analysis of soil-water-stress tri-field coupling,providing precise nu-merical foundations for slope stability evaluation and engineering mitigation in high-rainfall regions.
作者
邓静
DENG Jing(The 2nd Geological Brigade of Sichuan,Chengdu 610000,China)
出处
《河南科技》
2025年第16期74-77,共4页
Henan Science and Technology
关键词
非饱和渗流耦合
应力场重分布
边坡稳定性
数值模拟
unsaturated seepage-stress coupling
stress field redistribution
slope stability
numerical simula-tion
作者简介
邓静(1991-),女,硕士,工程师,研究方向:水文地质、工程地质与环境地质。
