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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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

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	Articles by authors
	SU Lihai1
	2
	YAO Zhihua2
	HUANG Xuefeng3
	LI Ning1
	QU Yaohui4

Cite this article:

SU Lihai1,2,YAO Zhihua2, et al. Water migration regularity of self weight collapsible loess ground[J]. , 2016, 35(S2): 4328-4337.

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

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