降雨条件下非饱和土边坡稳定性分析  

Analysis on Stability of Unsaturated Soil Slope under Rainfall Condition

作　　者：覃枭雄 冯健雪 甄键 罗杰 王龙 QIN Xiaoxiong;FENG Jianxue;ZHEN Jian;LUO Jie;WANG Long(Guangxi Nantian Expressway Co.,Ltd.,Nanning 547200,China;School of Civil Engineering and Architecture,Guizhou Minzu University,Guiyang 550025,China;Shanghai Tieyu Engineering Technology Co.,Ltd.,Shanghai 201101,China;Guizhou Investment and Construction Co.,Ltd.of China Construction Fourth Engineering Bureau,Guiyang 550081,China;School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China)

机构地区：[1]广西南天高速公路有限公司,南宁547200 [2]贵州民族大学建筑工程学院,贵阳550025 [3]上海铁妤工程科技有限公司,上海201101 [4]中建四局贵州投资建设有限公司,贵阳550081 [5]江南大学环境与土木工程学院,江苏无锡214122

出　　处：《路基工程》2024年第6期15-20,共6页Subgrade Engineering

基　　金：国家自然科学基金项目(52208345);江苏省自然科学基金项目(BK20210479);广西南天高速公路有限公司科技项目:基于无人机H3S全息三维实景物联大数据的高速公路建设安全管理关键技术研究(2022年)。

摘　　要：基于COMSOL软件流固耦合及非饱和渗流模型,通过布尔变量区分边坡饱和与非饱和区,并基于强度折减法进行降雨条件下边坡稳定性的数值模拟研究,考虑土中水分含量变化对毛细黏聚力、内摩擦角和重度的影响。研究表明:土体类型和降雨类型对边坡孔隙水压力分布和安全系数的影响较大,黏土边坡浅层土体更趋于饱和,湿润锋位置处上下侧孔隙水压力数值跨度较大,不同降雨类型条件下边坡的安全系数存在显著差异;湿润锋消失后,降雨类型影响程度由深至浅依次为后锋型、均匀型、中锋型和前锋型。Based on the fluid-solid coupling and unsaturated seepage model of COMSOL software,the saturated and unsaturated areas of slope were differentiated by Boolean variables,and the numerical simulation of slope stability under rainfall conditions was carried out based on the strength reduction method.The influence of changes in soil moisture content on capillary cohesion,internal friction angle and weight of soil was considered.The results show that soil type and rainfall type have great influence on slope pore water pressure distribution and safety factor.Clay slope soil tends to be more saturated in shallow layer,and pore water pressure values on upper and lower side of wetting front have a large span,and slope safety factor has significant difference under different rainfall types.After the wetting front disappeared,the influence degree of rainfall type was posterior front type,average type,central front type and forward type from deep to shallow.

关 键 词：降雨入渗 非饱和土边坡 基质吸力 强度折减法 COMSOL软件 

分 类 号：TU42[建筑科学—岩土工程]