(1. Department of Civil Engineering，Logistical Engineering University，Chongqing 401311，China；
2. Chongqing Key Laboratory of Geomechanics and Geoenvironmental Protection，Logistical Engineering University，Chongqing 401311，China；3. Chongqing Bureau of Geology and Minerals Exploration，Chongqing 400071，China)
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.
覃小华1，2，刘东升3，宋强辉1，2，杜春兰3，王 旭1，2. 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[J]. 岩石力学与工程学报, 2017, 36(2): 475-.
QIN Xiaohua1，2，LIU Dongsheng3，SONG Qianghui1，2，DU Chunlan3，WANG Xu1，2. Experimental study on one-dimensional vertical infiltration in soil column under rainfall and the derivation of permeability coefficient. , 2017, 36(2): 475-.
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2017, Vol. 36 
