自重湿陷性黄土场地的水分运移规律研究

doi:10.13722/j.cnki.jrme.2015.1512

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摘要依托兰州和平镇大厚度自重湿陷性黄土场地上的大型原位浸水试验，分析TDR水分计实时记录的体积含水率变化数据，研究大厚度自重湿陷性黄土场地水分运移规律。结果表明：自重湿陷性黄土场地浸润区和饱和区均呈现类似椭圆状的形态，可能与试坑未设注水孔等因素有关。水分的扩散并不是沿着某一固定的浸润角向下入渗，早期浸润线基本上是直线入渗，随后过渡为椭圆状入渗。场地中竖向渗透要快于径向渗透，这与黄土的竖向节理结构有着密切联系。当水分运移至埋深较大的土层时，此时径向渗透作用加大，竖向渗透会变缓。湿润锋的竖径比在浸水开始时较大，随着浸水时间的增加湿润锋竖径比会迅速下降，当入渗锋到达15 m之后，竖径比减小并趋于缓和。竖向扩散系数基本呈现出幂函数减小形态，而径向扩散系数呈现“小–大–小”的变化规律，给出了竖向和径向扩散系数随浸水时间变化的数学表达式。研究结果为认识大厚度自重湿陷性黄土场地水分运移规律提供了坚实的试验基础，亦可以为进一步研究大厚度自重湿陷性黄土场地的湿陷变形规律提供科学依据。

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	苏立海1
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	姚志华2
	黄雪峰3
	李宁1
	屈耀辉4

关键词 ：土力学, 自重湿陷性黄土, 原位浸水试验, 水分运移, 湿润锋, 扩散系数

Abstract：On basis of a large-scale in-situ soaking test in a self weight collapsible loess ground located in Lanzhou City，Gansu Province，volumetric water content recorded in real-time by TDR water meters was analyzed to research water migration morphology in the self weight collapsible loess ground with heavy section. The results show that，infiltration zone and saturated zone similarly take on a elliptical shape in the self weight collapsible loess ground，which would be associated without water injection hole. Water migration is not downward with permanent infiltration angle. The phreatic line is basically linear in advance，then becomes elliptical infiltration. The vertical penetration is faster than the radial penetration. When the moisture penetrates into the deeper soil layer，that vertical penetration will decrease and the radial penetration will increase which would be associated with joint and fissure. Vertical-horizontal ration of wetting front is larger at the beginning of soaking test. With the increase of soaking time，the vertical-horizontal ration decreases rapidly. After the infiltration front reaches 15 m，the vertical-horizontal ration decreases gently. The vertical diffusion coefficient shows a decreasing form of basic power function，and the radial diffusion coefficient shows a variation of“small-big-small”. The mathematical expressions of vertical and radial diffusion coefficient with change of soaking time are given. Analysis results would provide a test foundation to know water migration regularity of self weight collapsible loess ground and some scientific basis for collapsible deformation in self weight collapsible loess area.

Key words： soil mechanics self weight collapse loess in-situ soaking test water migration wetting front diffusion coefficient

引用本文:

苏立海1，2，姚志华2，黄雪峰3，李宁1，屈耀辉4. 自重湿陷性黄土场地的水分运移规律研究[J]. 岩石力学与工程学报, 2016, 35(S2): 4328-4337.
SU Lihai1，2，YAO Zhihua2，HUANG Xuefeng3，LI Ning1，QU Yaohui4. Water migration regularity of self weight collapsible loess ground. , 2016, 35(S2): 4328-4337.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1512 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4328

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