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本文首先基于砾石土料实测的不同竖向应力作用下的土-水特征曲线,预测对应的渗透系数曲线,并通过饱和-非饱和稳定渗流分析对不同各向异性程度的均质土坝采用有无竖向应力作用下的土-水特征曲线和渗透系数曲线计算所得的渗流场进行比较。结果表明:采用有竖向应力作用下的曲线计算的渗流场饱和区范围较大,不同部位的孔隙水压力变化的规律不同,但坝体各向异性程度越大,坝体中的孔隙水压力值受竖向应力的影响越小;无论有无竖向应力作用,坝体的各向异性程度均对坝料的水力特性无明显影响,但有无竖向应力作用时的体积含水率差异较大。
In this paper, based on the soil-water characteristic curve under different vertical stress measured by gravel soil material, the corresponding permeability coefficient curve is predicted. By using saturated-unsaturated steady flow analysis, the homogeneous soil dam with different anisotropy degree The soil-water characteristic curves without vertical stress and the seepage field calculated by the permeability coefficient curve are compared. The results show that the saturated zone of seepage field calculated by the curve with vertical stress has a large range and the pore water pressure changes in different parts have different laws. However, the greater the degree of anisotropy, the more the pore water pressure in the dam The value of the vertical stress is less affected; the degree of anisotropy of the dam has no significant effect on the hydraulic characteristics of the dam, no matter whether there is vertical stress or not, but the difference of the volumetric water content when there is no vertical stress Big.