Study on checking and measuring the improved effect of the silt foundation by the transient state surface wave

In order to improve the liquidation sand and silt crossbedded foundation synthetically in a highway,the improved sand bag wells have been used.As the checked and measured result of the Standard Penetration Test(SPT)wasn't notable,the transient state surface wave was fetched into checking and measuring the improved effect.By contrastively analyzing the surface wave velocity,the profile image of the wave velocity,the average shear wave velocity and the average dynamic shear modulus,the effect of the improved sand bag wells was notable to some extent.So the method of the transient state surface wave can be applied in checking and measuring silt foundation.