8E. F. Garcia C, P. K. Gallage T, Uchimura. Function of permeable geosynthetics in unsaturated embankments subjected to rainfall infiltration[J]. Geosynthetics International,14(2) : 89 -99.
9C. W. W. Ng,L. T. Zhan,C. G. Bao,et al. Performance of an unsaturated expansive soil slope subjected to artificial rainfall infiltration [ J ]. Geotechnique, 53 (2) : 143 - 157.