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降雨条件下压实黄土水分入渗规律模型试验研究

朱才辉, 张世斌

朱才辉, 张世斌. 降雨条件下压实黄土水分入渗规律模型试验研究[J]. 岩土工程学报, 2018, 40(6): 1117-1124. DOI: 10.11779/CJGE201806018
引用本文: 朱才辉, 张世斌. 降雨条件下压实黄土水分入渗规律模型试验研究[J]. 岩土工程学报, 2018, 40(6): 1117-1124. DOI: 10.11779/CJGE201806018
ZHU Cai-hui, ZHANG Shi-bin. Rainfall infiltration laws of compacted loess based on laboratory model tests[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1117-1124. DOI: 10.11779/CJGE201806018
Citation: ZHU Cai-hui, ZHANG Shi-bin. Rainfall infiltration laws of compacted loess based on laboratory model tests[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1117-1124. DOI: 10.11779/CJGE201806018

降雨条件下压实黄土水分入渗规律模型试验研究  English Version

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项目(16JS073)
详细信息
    作者简介:

    朱才辉(1983- ),男,陕西商南人,博士,副教授,从事黄土力学与工程、隧道工程及数值仿真研究。E-mail: zhucaihui123@163.com。

Rainfall infiltration laws of compacted loess based on laboratory model tests

  • 摘要: 以西北地区黄土高填方工程为研究背景,在自行研发水分迁移特性测试设备的基础上,开展了重塑压实黄土在降雨入渗条件下的水分迁移特性室内模型试验,获得了不同压实度下黄土的“电阻率-饱和度”Archie模型和“饱和度-基质吸力”Fredlund-Xing模型及参数变化规律,建立了基于土电阻率的基质吸力幂指数预测公式;研究了不同压实度黄土在不同雨型条件下的入渗特征及其入渗速率、饱和度、电阻率等随时间和土层深度的变化规律。研究结果表明:①雨型不同,压实黄土的入渗特征各异,小雨下入渗线呈“Y”型(最大入渗深度Hmax=0.20~0.35 m),大雨下呈“D”型(Hmax=0.55~0.65 m),暴雨下呈倒“V”字型(Hmax>0.8 m),入渗速率与雨量正相关,与土层深度和压实度反相关;②土体电阻率变化规律与饱和度变化过程相反,基质吸力预测值和实测电阻率变化方向一致;③采用土电阻率方法可以为深入探索黄土高填方的长期变形机制和稳定性预警或灾害防治提供一个新的途径。
    Abstract: Based on the high loess-filled embankment projects in north western regions of China, the model test apparatus is developed to investigate the water migration of compacted loess under different rainfall infiltrations. An electrical resistivity model versus saturation degree (named Archie model) and a matric suction model versus saturation degree (called Fredlund-Xing model) are established, and then the power exponent prediction formula for electrical resistivity versus matric suction is also obtained. The evolution laws of infiltration ratio, saturation degree and electrical resistivity of compacted loess with time and depth under different types of rainfall and compaction degrees are revealed through a large amount of laboratory experiments. The results show that: (1) The rainfall infiltration features of compacted loess are very different. The infiltration line exhibits “Y” shape under light rain (the maximal infiltration depth Hmax is equal to 0.20~0.35 m ), it appears to be “D” shape under heavy rain (Hmax=0.20~0.35 m ), and it is inverted “V” shaped under intense fall (Hmax>0.8 m). (2) There is a positive correlation between the infiltration ratio and the rain capacity, negatively correlated with soil depth and compaction degree. (3) The electrical resistivity method for soils can provide a new way for exploring in depth the long-term deformation mechanism and stability prediction or disaster prevention of high loess-filled embankments.
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出版历程
  • 收稿日期:  2017-03-06
  • 发布日期:  2018-06-24

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