堆积碎石土中细小黏粒的细观孔隙特征
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国家自然科学基金资助项目"基于新颖核机器的堆积碎石土滑坡非平稳变形行为研究"(51108397)


Microscopic Pore Characteristics of Fine Clay Particals in Eluvial Gravel Soil
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    摘要:

    孔隙特征(多孔性、变异性、复杂性)对雨水入渗的具有重要影响。应用图像处理技术对具有级配代表性的湖南省湘潭市昭山区某堆积碎石土斜坡中细小黏粒的细观孔隙特征进行了试验研究。研究结果表明,相同质量的细小黏粒土体的孔隙度与含水率存在二次曲线关系,试验土体在含水率为10.41%时压实性最好;孔隙数目、孔隙复杂度以及孔隙变异度随着含水率的增加而减小,表明含水率越小孔隙的扭曲程度越高,孔隙就越复杂,且孔隙数含量越多,越有利于表层雨水下渗;不同含水率下孔隙定向角在10°~20°,50°~60°,100°~110°,140°~150°这4个方位上分布相对密集,且含水率越小,孔隙定向性相对较明显;孔隙定向角分布具有辐射状,含水率为15%时最为明显,有利于水分的水平渗透迁移。

    Abstract:

    Due to the influence of pore characteristics(porosity, variability and complexity) on rain infiltration, the microscopic pore characteristics of fine clay in eluvial gravel soil with representative grade of a slope in Zhaoshan Zone in Xiangtan City of Hu'nan Province were studied through image processing technology. The results show that there is a quadratic curve relationship between porosity and moisture content in fine clay particals under the same quality, and the experiment soil has the best compaction when the moisture content is 10.41%; the pore number, the pore tested and the pore variability decreases with the increase of the moisture content variation degree, its indicate that the smaller of the pore moisture content, the higher level of distortion and the more complex of pore, and the more pore number, the more beneficial to infiltration for surface water; the pore orientation angle under different moisture content are concentrated in 10°~20°, 50°~60°, 100°~110°, and 140°~150°, and the less moisture content, the more obvious pore directionality is; the distribution of the pore's angle shows a radial structure, and the description is most evident when the moisture content is 15%, and is advantageous to the level osmosis migration of moisture.

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董辉,李智飞.堆积碎石土中细小黏粒的细观孔隙特征[J].水土保持通报,2014,(4):173-177,183

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  • 收稿日期:2013-09-08
  • 最后修改日期:2013-09-23
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  • 在线发布日期: 2016-04-05
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