探究降雨条件下路基边坡渗流情况

Inquiry on subgrade slope seepage conditions under rainfall condition

结合岩土饱和—非饱和渗流理论,并采用有限元软件,模拟分析了不同降雨条件下路基边坡的孔隙水压力变化、渗流场和含水率的分布情况,结果表明:当降雨强于饱和渗透系数时,随时间的增加入渗深度逐渐向下推移,而推移深度也会不断加大;当降雨强度小于土壤入渗能力时,入渗速度慢;裂缝的存在对降雨入渗过程中孔隙水压力和含水率分布有很大的影响。

Combining with geotechnical saturated and unsaturated infiltration theory,applying finite element software,the paper simulates and analyzes subgrade slope pore-water pressure change,seepage field and moisture ratio distribution conditions under different rainfall conditions.Results show that: when the rainfall is stronger than saturated seepage coefficient,the infiltration depth will gradually develop with the time increasing,while the developing depth will gradually increase,when the rainfall strength is smaller than soil infiltration capability,the infiltration speed will reduce,and the cracks will have great impact upon pore-water pressure and moisture ratio distribution in rainfall infiltration process.