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非饱和水力参数在计算滑坡降雨入渗过程与稳定性时是至关重要的材料参数。在三峡库区黄土坡滑坡上进行双环渗透试验,获取黄土坡滑坡表土层的饱和渗透系数。对黄土坡滑坡表土层的含水率和基质吸力进行实时监测,采集了黄土坡滑坡表土层中含水率和基质吸力随时间的变化数据,采用van Genuchten土-水特征曲线模型拟合了4个实时监测剖面的土-水特征曲线及其拟合参数。将饱和渗透系数与土-水特征曲线拟合参数代入van Genuchten渗透系数函数模型,求出了黄土坡滑坡表土层在非饱和条件下的渗透系数函数,为黄土坡滑坡在降雨作用下的稳定性计算提供了可靠的水力参数。
Unsaturated hydraulic parameters are crucial parameters in the calculation of rainfall infiltration process and stability of landslide. The double-ring infiltration test was carried out on Huangtupo landslide in the Three Gorges reservoir area to get the saturated permeability coefficient of the topsoil in Huangtupo landslide. The moisture content and matrix suction of topsoil in Huangtupo landslide were monitored in real time. The data of moisture content and substrate suction in Huangtupo landslide were collected. The data of van Genuchten soil-water characteristic curve were fitted to four real-time Soil - water characteristic curves of monitoring sections and their fitting parameters. The fitting parameters of saturated permeability coefficient and soil-water characteristic curve were substituted into the van Genuchten coefficient of permeability model to obtain the permeability coefficient of Huangtupo landslide under unsaturated conditions, which is the stability of Huangtupo landslide under rainfall Calculations provide reliable hydraulic parameters.