刘小华,廖红建,牛波,何玉琪,倪诗雨

• 1:广州地铁设计研究院股份有限公司
• 2:西安交通大学土木工程系

摘要(Abstract)：

【目的】改良黄土渗透性，加强黄土地基的自防水功能，能够有效降低降雨条件下湿陷性黄土地基灾害发生的概率。【方法】为此，开展了一系列不同生态环境友好型疏水材料(SHP 60 Plus)质量比改良黄土的三轴渗透试验，探究了渗流时间、孔隙比和疏水材料质量比对黄土饱和渗透系数的影响，并基于lgk-lge渗透模型和渗透试验结果，建立了改良黄土的渗透模型；通过建立疏水性孔隙通道模型和结合土-水接触角试验结果，从微观角度揭示了改良机制。【结果】结果显示：改良黄土的渗透系数随着渗流时间的增加逐渐降低然后趋于稳定；改良黄土稳定阶段的渗透系数随孔隙比的降低呈非线性减少趋势；1%疏水材料质量比改良黄土的渗透系数比未改良黄土降低了1个数量级。【结论】结果表明，疏水材料的掺入会提高有效孔隙通道直径的阈值，使得无法发生渗流的孔径范围增大，导致渗透系数减小，渗透性降低。

关键词(KeyWords)： 改良黄土;渗透系数;疏水材料;渗透模型;有效孔径

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51879212,41630639);; 陕西省重点研发计划项目(2019KWZ-09)

作者(Author): 刘小华,廖红建,牛波,何玉琪,倪诗雨

DOI: 10.13928/j.cnki.wrahe.2023.06.015

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