摘要
降雨条件下浅层土质边坡稳定性具有复杂性与不确定性,难以通过单一因素作出客观准确地评价。为了探究不同降雨强度和历时条件下黄平县某浅层土质边坡稳定性的变化规律,采用岩土试验和数值模拟相结合的方法,通过编写FISH语言实现降雨对边坡稳定性的动态耦合求解。通过岩土试验得出杂填土和黏土层的渗透系数,FLAC^(3d)数值模拟采用流固耦合理论能够综合考虑降雨条件和土体特性对边坡稳定性的真实影响。结果表明,雨水入渗使土体强度降低,杂—黏界面是潜在不稳定最主要的薄弱结构面;最大孔隙水压力集中区域随降雨强度增大逐渐向边坡内部转移;边坡张裂缝可将暴雨(100 mm/d)形成的地表径流快速导入杂—黏界面使其加速活化,边坡更快进入欠稳定状态(F_(s)=1.15)。
The stability of shallow soil slope under rainfall conditions is complex and uncertain,making it difficult to evaluate objectively and accurately based on a single factor.In order to explore the variation law of stability of a shallow soil slope in Huangping County under different rainfall intensity and duration conditions,a combination of geotechnical testing and numerical simulation was used to dynamically couple the rainfall effect on slope stability by writing FISH language.The permeability coefficients of miscellaneous fill and clay layers were obtained through geotechnical testing.The FLAC^(3D) numerical simulation adopting the fluid-solid coupling theory can comprehensively consider the true influence of rainfall conditions and soil characteristics on slope stability.The results show that the decrease of soil strength due to water seepage,the miscellaneous fill-clay interface is the potential unstable weak structure,the maximum pore water pressure concentration area gradually shifts to the slope interior with increasing rainfall intensity.Slope cracking can quickly direct surface runoff formed by heavy rain(100mm/d)into the miscellaneous fill-clay interface to accelerate its activation,and the slope enters an unstable state more quickly(F_(s)=1.15).
作者
王崇敬
张龙
Wang Chongjing;Zhang Long(Department of Earth Science and Engineering,Shanxi Institute of Technology,Yangquan,Shanxi 045000;China Construction Sixth Engineering Division Co.,Ltd.,Tianjin 300450)
出处
《资源环境与工程》
2024年第2期212-220,共9页
Resources Environment & Engineering
