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土质边坡在不同降雨强度下的渗流场分析

Simulation of seepage flow in unsaturated soil under different rainfall intensity
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摘要 在FLAC3D计算模型中利用FISH语言自编模块实时修改非饱和区单元的表观渗透张量以实现饱和—非饱和渗流分析,实时改变边界条件以考虑降雨入渗过程中的不定边界。以降雨强度和降雨历时为参数,并考虑地表径流形成的水膜对渗流场的影响,分析了不同降雨强度下饱和—非饱和均质土质边坡渗流场的分布规律。通过实例计算得出:降雨过程中,基质吸力变化范围主要集中于浅层地表,降雨强度越大,降雨历时越长,受降雨影响的范围越大;地表雨水容易达到的区域的基质吸力最先开始变化,且经历初始缓慢变化、加速变化和稳定不变三个阶段,雨强越大,基质吸力变化越快,最终稳定值越大;地表径流形成的不同厚度的水膜对暂态饱和区的影响显著;降雨停止后,随着坡体内孔隙水的消散,渗流场依然具有很明显的变化。研究成果与已有结论进行定性对比,验证了自编模块适用于降雨入渗条件下饱和—非饱和土质边坡的渗流计算,为利用FLAC3D解决非饱和土体的流—固耦合问题开拓了一种新思路。 A newly self-program module was developed based on FISH language with FLAC3 D to analyse saturated-unsaturated seepage by modifying the apparent permeability tensor of unsaturated zone in time and to consider indefinite boundary of rainfall infiltration by changing boundary conditions at each calculation step.Considering the influence of water film induced by surface runoff on seepage field and combining with the two parameters of rainfall intensity and duration,the distribution regularity of saturated-unsaturated seepage field was discussed.The results indicate that during the process of rainfall,the matric suction change is mainly found in the shallow surface.The greater the rainfall intensity and the longer the rainfall duration,the more region influenced by rainfall is;the matric suction of the zone where rainwater infiltration reaches easily will change firstly,and the change has three phases,i.e.initial slow change,accelerated change and stable change.The greater the rainfall intensity,the faster the matric suction changes and the grater the final stable value are;the different thickness water film induced by surface runoff have a significant effect on the transient saturation zone;after the rainfall stops,seepage field will change significantly with slope pore water dissipating.Compared with the existing results from others,the self-programmed module is proved suitable to calculate saturated-unsaturated seepage of soil slope during rainfall,and provides a new method to solve the fluid-solid coupled problem for unsaturated slope.
作者 杨洪伟 Yang Hongwei(Chongqing High-tech Engineering Survey and Design Institute Co.,Ltd.,Chongqing 401121,China)
出处 《工程勘察》 2019年第5期1-7,13共8页 Geotechnical Investigation & Surveying
基金 住房和城乡建设部新型建筑结构技术课题(No.2015-K2-034).
关键词 土质边坡 降雨入渗 饱和—非饱和渗流 不定边界条件 soil slope rainfall infiltration saturated-unsaturated seepage indefinite boundary condition
作者简介 杨洪伟(1989-),男(汉族),四川遂宁人,双学士,工程师.
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