摘要
在非饱和状态下,黄土具有复杂的土-水特性及工程性质,多数情况下降雨是导致填方黄土边坡形变及失稳的主要原因。为了分析降雨入渗条件下非饱和黄土边坡稳定性,利用GCTS土-水特性曲线仪获取黄土土-水特性试验数据,通过ABAQUS软件利用强度折减法,分别从降雨强度、降雨历时、降雨类型、SWCC、渗透系数5个方面对边坡的稳定性进行了分析评价,获得了不同降雨要素作用下边坡稳定性的变化规律。结果表明:在其他条件保持不变时,随着雨强和历时的增加,填方黄土边坡的稳定性逐渐下降;在总降雨量保持恒定的情况下,长时弱降雨条件作用下,边坡的安全系数最低;在其他条件保持一定时,颗粒粒径越小,边坡安全系数越高;随着渗透系数的减小,边坡的安全系数降低。
In the unsaturated state,loess exhibits complex soil-water characteristics and engineering properties.In most cases,rainfall is the main cause of deformation and instability of filled loess slopes.To analyze the stability of unsaturated loess slopes under rainfall infiltration conditions,the GCTS soil-water characteristic curve apparatus was used to obtain experimental data on loess soil-water characteristics.The strength reduction method in ABAQUS software was adopted to analyze and evaluate slope stability from five aspects:rainfall intensity,rainfall duration,rainfall type,SWCC(Soil-Water Characteristic Curve),and permeability coefficient,and the variation laws of slope stability under the action of different rainfall factors were obtained.The results show that:with other conditions remaining unchanged,the stability of filled loess slopes gradually decreases as rainfall intensity and duration increase;under the condition of constant total rainfall,the safety factor of the slope is the lowest under long-term weak rainfall;with other conditions fixed,the smaller the particle size,the higher the slope safety factor;as the permeability coefficient decreases,the slope safety factor decreases.
作者
白雪亮
王汉勋
张彬
穆青毅
BAI Xueliang;WANG Hanxun;ZHANG Bin;MU Qingyi(PowerChina Northwest Engineering Corporation Limited,Xi'an 710199,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710061,China)
出处
《西北水电》
2025年第6期102-109,共8页
Northwest Hydropower
基金
国家自然科学基金项目(51879212)。
