| 张世斌,朱才辉,袁继国.降雨条件下重塑黄土中水分迁移模型试验研究[J].水利学报,2019,50(5):621-630 |
| 降雨条件下重塑黄土中水分迁移模型试验研究 |
| Laboratory model tests on moisture migration in remolded loess under rainfall conditions |
| 投稿时间：2019-03-08 |
| DOI：10.13243/j.cnki.slxb.20190149 |
| 中文关键词: 降雨入渗 重塑黄土 水分迁移 体积含水率 电阻率 |
| 英文关键词: rainfall infiltration remolded loess moisture migration volumetric water content resistivity |
| 基金项目:国家自然科学基金项目（51678484）；陕西省黄土力学与工程重点实验室基金（16JS073） |
|
| 摘要点击次数: 1654 |
| 全文下载次数: 1070 |
| 中文摘要: |
| 在黄土地区，降雨作用是诱发灾害的主导因素之一，研究重塑黄土在降雨入渗条件下的水分迁移特性有着重要意义。本研究自行研发了水分迁移特性测试装置，将黄土的体积含水率与电导率特性等引入到一个测试系统中，在降雨入渗条件下，开展了重塑黄土中水分迁移模型试验。研究结果表明：不同压实度试样（k=0.75~0.91），小雨（日降雨量为7.1 mm）时水分在试样中迁移的最大深度Hmax=0.20~0.35 m，大雨（日降雨量为35.4 mm）和暴雨（日降雨量为63.7 mm）时水分迁移最大深度分别为Hmax=0.55~0.65 m，Hmax>0.70 m；建立黄土电阻率与饱和度之间的关系式，采用黄土电阻率的方法探究重塑黄土中水分迁移特性；不同雨型下，重塑黄土中水分迁移特征各异，小雨状态下的入渗线呈现出"Y"型，大雨状态下的入渗线呈现出"D"型，暴雨状态下的入渗线呈现出"Λ"型。 |
| 英文摘要: |
| In loess area,most of the loess disasters are caused by rainfall. It is important to study the mois-ture migration characteristics of remolded loess under rainfall infiltration conditions. In this paper, a mois-ture migration characteristic test device is developed,and the volumetric water content and conductivity char-acteristics of loess are introduced into a test system. Under the condition of rainfall infiltration, the model of moisture migration model in remolded loess is carried out. The results show that samples with different degrees of compaction (k=0.75~0.91), the maximum depth of water infiltration is Hmax=0.20~0.35m under light rain (Daily rainfall is 7.1mm), Hmax=0.55~0.65m, Hmax>0.70m under heavy rain (Daily rainfall is 35.4mm) and rainstorm (Daily rainfall is 63.7mm). The relationship between resistivity and saturation of loess is established,and the loess resistivity method is used to investigate the moisture migration character-istics of remolded loess. The water migration features of remolded loess are different under different rainfall, the rain infiltration line presents "Y" shape under light rain,appears "D" shape under heavy rain,and shows "Λ" shape under rainstorm. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |