7Hecheng Liang, Aiguo Zhou and Qinsheng Jin. Application of Extra Long Packed Drain for Soft foundation in Highways[S]. Water Resources and the Urban Environment. 9- 10 November 2003, Wuhan, P.R. China. 517 - 521.
8JTJ017—96.公路软土地基路堤设计与技术规范[S].[S].,..
9Xie. K. H, Zhu. X. Y, Pan. Q. Y. and Zeng. G. X. Recent Studies on the Smear Action of Vertical Drains. Proc. Of Int. Conference on Geotechnical Eng. And Earthquake Resistant Technology in Soft Soil Areas. 1993.