ISSN 1003-8035 CN 11-2852/P
    黄晓虎,张芷宁,张鹏,等. 不同降雨条件下非饱和裂隙土优势流入渗特征研究[J]. 中国地质灾害与防治学报,2024,35(0): 1-12. DOI: 10.16031/j.cnki.issn.1003-8035.202403005
    引用本文: 黄晓虎,张芷宁,张鹏,等. 不同降雨条件下非饱和裂隙土优势流入渗特征研究[J]. 中国地质灾害与防治学报,2024,35(0): 1-12. DOI: 10.16031/j.cnki.issn.1003-8035.202403005
    HUANG Xiaohu,ZHANG Zhining,ZHANG Peng,et al. Study on the dominant infiltration characteristics of unsaturated fissure soil under different rainfall conditions[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-12. DOI: 10.16031/j.cnki.issn.1003-8035.202403005
    Citation: HUANG Xiaohu,ZHANG Zhining,ZHANG Peng,et al. Study on the dominant infiltration characteristics of unsaturated fissure soil under different rainfall conditions[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-12. DOI: 10.16031/j.cnki.issn.1003-8035.202403005

    不同降雨条件下非饱和裂隙土优势流入渗特征研究

    Study on the dominant infiltration characteristics of unsaturated fissure soil under different rainfall conditions

    • 摘要: 本文将膨胀土滑坡中的降雨入渗简化为垂直的斜坡土柱模型,利用Richards方程基本理论,基于离散孔隙-裂隙介质模型,结合短时强降雨和长时弱降雨两种典型降雨工况,以不同裂隙深度为主要变量,从入渗过程、饱和度剖面、入渗率、表面压力及入渗量来探讨裂隙在发育演化过程中的优势流入渗特征。结果表明,(1)裂隙处,降雨在裂隙末端形成暂饱和区,随后向裂隙两侧水平入渗,饱和方式为由下向上饱和;无裂隙处降雨主要沿土柱表面向下垂直入渗,为由上向下饱和。(2)短时强降雨作用下,随着裂隙深度增加,优势流控制着降雨入渗的过程,入渗量和入渗深度与裂隙深度呈正比,入渗深度与裂隙深度基本一致。(3)长时弱降雨作用下,优势流入渗效果减弱,优势流现象产生较慢,降雨沿裂隙入渗速度与在基质孔隙入渗速度基本一致,入渗主要表现为沿土柱表面向下的垂直入渗。

       

      Abstract: This paper simplifies the rainfall infiltration in expanding soil landslide into a vertical slope soil column model. Utilizing the basic theory of the Richards equation and based on a discrete pore-fracture medium model, combined with two typical rainfall conditions of short-term heavy rainfall and long-term light rainfall, with different fracture depths as the main variable, the study explores the preferential flow infiltration characteristics during the development and evolution of fractures from the dominant permeability, saturation profile, permeability rate, surface pressure, and permeability in the development of permeability characteristics. The results show that, (1) at the fissure, the rainfall forms a temporary saturation area at the end of the fissure, then horizontally infiltrates to both sides of the fissure, with the saturation mode being bottom-up. at non-fracture sites, rainfall mainly vertically infiltrates along the soil column surface, with the saturation mode being top-down.(2) Under short-term heavy rainfall, with the increase of fissure depth, the dominant flow controls the process of rainfall infiltration. The infiltration amount and infiltration depth are directly proportional to the fissure depth, and the infiltration depth is basically consistent with the fissure depth.(3) Under long-term weak rainfall, the infiltration effect of dominant inflow is weakened, and the phenomenon of dominant flow is slow. The infiltration speed of rainfall along the fissure is basically the same as that of the matrix pore, and the infiltration is mainly manifested as vertical infiltration downward along the surface of the soil column.

       

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