1Burland. J. B. Ninth laurits bjerrum memorial lecture: "small is beautiful"-the stiffness of soils at small strains[J]. Canadian geotechnical journal, 1989,V26.
2Jardine. R. J. & M. J. Symes. & Burland. J. B. The measurement of soil stiffness in the triaxial apparatus[J]. Geotechnique, 1984,34(3).
3Atkinson. J. H, D. richardson & S. E. stallebrass. Effect of recent stress history on the stiffness of overconsolidated soil[J]. Geotechnique, 1990,40(4).
4Smith. P. R & Jardine. R. J. The yielding of bothkennar clay[J].Geotechnique, 1992, 42(2).