优势渗流层夹层对边坡入渗过程及稳定性影响分析
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河南大学土木建筑学院

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X43

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河南省科技厅项目(182102310737);河南省教育厅项目(16A560002)


Analysis of the influence of dominant seepage layer interlayers on the infiltration process and stability of slopes
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1.College of Civil Engineering and Architecture,Henan University;2.College of Civil Engineering and Architecture,Henan University,Kaifeng

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    摘要:

    优势渗流层通常具有强渗透性,对整个边坡的入渗过程和稳定性有较大影响。针对间歇性降雨条件下优势渗流层夹层对边坡渗流特性和稳定性的影响研究不足,利用有限元软件Geostudio建立了含优势渗流层粉砂土边坡的降雨入渗模型。基于饱和-非饱和渗流理论,改变边坡中优势渗流层各向异性比值、优势渗流层位置、优势渗流层形状,模拟了在间歇性降雨条件下降雨时刻、停雨间歇和雨后的入渗过程,揭示了边坡渗流速度、体积含水率和安全系数的变化规律。结果表明:坡肩处的渗流速度随着优势渗流层各向异性比值的的增大而增大。在空间位置上优势渗流层部分的体积含水率随高程的变化趋势大致呈n字型,且优势渗流层的位置改变1m,n字形会在体积含水率随高程的变化图中沿着图中x轴偏移1.5m。边坡中所含的优势渗流层位置越低,边坡越不稳定。

    Abstract:

    The dominant seepage layer usually has strong permeability, which has a great influence on the Infiltration process and stability of the whole slope. Insufficient research on the influence of dominant seepage layer interlayers on the seepage characteristics and stability of slopes under intermittent rainfall conditions, a rainfall infiltration model of silt soil slopes with dominant seepage layer was established by using finite element software Geostudio. Based on the saturated-unsaturated seepage theory, Changing the anisotropy ratio of the dominant seepage layer, the location of the dominant seepage layer, and the thickness of the dominant seepage layer in the slope, we simulated the infiltration process at the moment of rainfall, between stopping rain, and after rainfall under the condition of intermittent rainfall, and revealed the change rules of seepage rate, volumetric water content, and safety coefficient in the slope. The results show that the seepage velocity at the slope shoulder increases with the increase of the anisotropy ratio of the dominant seepage layer. In the spatial position, the volume water content of the dominant percolation layer shows an N-shaped trend with the elevation, and if the position of the dominant layer is changed by 1m, the n-shape will be shifted along the x-axis in the graph of the change of volumetric water content with the elevation by 1.5 m. The lower the position of the dominant seepage layer in the slope, the more unstable the slope is.

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韩长玉,刘旭杰,赵浩汀,等. 优势渗流层夹层对边坡入渗过程及稳定性影响分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-04
  • 最后修改日期:2024-05-24
  • 录用日期:2024-05-29
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