It has been well reported that the resistance of soil structure is the same important as stress history and initial water content in interpreting the mechanical behavior for most natural sedimentary soils. For assessing the effects of the resistance of soil structure on the mechanical behavior, Burland has proposed the so-called intrinsic compression line (ICL) and the sedimentation compression line (SCL) with introducing a normalizing parameter called the void index. However, the sensitive clays are not included in his study. The extensive data on sensitive Ariake clays are used in this study to investigate the compression behavior through comparing with the ICL and the SCL. The analysis results indicate that the compression curves of the remolded Ariake clays can be normalized by the void index proposed by Burland. But most natural Ariake clays lie well above the sedimentation compression line. It is considered that salt removal is the main factor for natural Ariake clays lying above well the SCL. Furthermore, it is found that the in-situ void ratio of Ariake clays has a relative good relationship with the effective overburden pressure. The relationship can be expressed by a straight line in a bilogarithmic plot, herein designated field state line (FSL) for Ariake clays.

As a new in-situ testing method ,SASW,namely ,the technique of transient Rayleigh surface wave,is applied in civil engineering widely.
On the basis of theory combined with field practice,this project studied the quality control and estimation in soil improvement and ground filling applying SASW.
The main application of SASW are as follows:
 quality control of soft clay pre-loading,
 quality control of liquefaction ground treating,
 quality control of large area ground filling .
Facing the economy constructing,the project applied the advanced techniques internationally to civil engineering in China recently. The study on consolidation control with SASW,relation between Rayleigh wave and soil density,SPT number will be advanced internationally.