降雨条件下一维土柱垂直入渗模型试验研究及其渗透系数求解

doi:10.13722/j.cnki.jrme.2016.0068

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Abstract A set of test system for studying the vertical infiltration in one-dimensional soil column under rainfall was developed. Four sets of tests were carried out to the unsaturated disturbed loess column under the different rainfall intensities. The time curves of the infiltration rate，the depth of the wetting front and the volumetric water content at the monitoring points were obtained.The formula of permeability coefficient was derived and the curve of the permeability coefficient varied with the matric suction of the disturbed loess was obtained. The rainfall intensity has great impact on the vertical infiltration in soil column. The infiltration rate equals to the rainfall intensity when the rainfall intensity is less than the minimum infiltration capacity of soil column. When the rainfall intensity is greater than the minimum infiltration capacity，the curve of infiltration rate can be divided into three stages，the non-compressive infiltration，the compressive infiltration and the saturated infiltration. The moment of occurrence of the dropsy point and the saturation point are different under different rainfall intensities，the greater the rainfall intensity，the earlier the dropsy point and saturation point appear，and the longer the stage of compressive infiltration. The permeability coefficient of the unsaturated remolded loess decreases exponentially with the increasing of matric suction.

Key words： soil mechanics rainfall intensity soil column vertical infiltration volumetric water content infiltration rate permeability coefficient

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	Articles by authors
	QIN Xiaohua1
	2
	LIU Dongsheng3
	SONG Qianghui1
	2
	DU Chunlan3
	WANG Xu1
	2

Cite this article:

QIN Xiaohua1,2,LIU Dongsheng3, et al. Experimental study on one-dimensional vertical infiltration in soil column under rainfall and the derivation of permeability coefficient[J]. , 2017, 36(2): 475-.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.0068 OR http://www.rockmech.org/EN/Y2017/V36/I2/475

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