干密度初始含水率坡度对紫色土崩解特性的影响

发布时间：2018-07-31 05:20

【摘要】：为研究干密度、初始含水率和坡度对紫色土崩解特征的影响,通过采用自制仪器对27种不同干密度、不同初始含水率和不同坡度的紫色土进行崩解试验,为三峡库区消落带静水侵蚀导致的水土流失现象提供理论依据,分别得到试样的崩解速率与干密度、初始含水率和坡度的曲线关系。结果表明:在相同初始含水率和坡度下,随着干密度的增加,崩解速率随着浸泡时间增加呈现先增加后减小;在相同干密度和坡度下,随着初始含水率的增加,崩解速率是随着浸泡时间的增加呈现先增加后减小;相同含水率且干密度一定下,随着坡度的增加,崩解速率随着浸泡时间的增加呈现先增加而后减小。研究发现试样崩解均是从底部开始崩解,且崩解区域随浸泡时间的增长由底部逐渐延伸到顶部。
[Abstract]:In order to study the effects of dry density, initial moisture content and slope on the disintegration characteristics of purple soil, 27 purple soils with different dry density, different initial moisture content and different slope were tested by self-made instruments. This paper provides a theoretical basis for the phenomenon of soil and water loss caused by static water erosion in the three Gorges Reservoir area, and obtains the relationship between the disintegration rate of the sample and the dry density, the initial moisture content and the slope, respectively. The results show that with the increase of dry density, the disintegration rate increases first and then decreases with the increase of soaking time under the same initial moisture content and slope, and increases with the increase of initial moisture content at the same dry density and slope. The disintegration rate increased first and then decreased with the increase of soaking time, and then decreased with the increase of slope at the same water content and the same dry density. It is found that the disintegration begins from the bottom, and the disintegration region extends from the bottom to the top with the increase of soaking time.
【作者单位】：三峡大学土木与建筑学院;三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心;
【基金】：长江水利委员会长江科学院开放研究基金资助项目“三峡库区植物根系增强紫色土抗水侵蚀效应与机理研究”(CKWV2015208KY)
【分类号】：S157

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