Analysis of Deep Earth Pressure Around Cast in place Pile Considering Concrete Property Variation

Abstract:

The rheologic properties of the deeply buried dark green silty clay in Shanghai area are depicted with the Burgers Model.Considering the concrete property variation in solidification,the deformation characteristics of concrete are analyzed with the elastic creep theories.The genetic integral equation of the pile’s radial deformation for the reason of the soil pressure around the pile is established.The analytical expression of the time varying horizontal pilesoil interaction force is developed through analyzing the condition of the displacement coordinary at the pilesoil interface.The research shows that the horizontal soil pressure around the pile，which is initially caused by the pouring process,tends to increasing gradually in deeply buried soil,with the ultimate value being earth pressure at rest.Since the cast in place pile’s vertical bearing capacity is directly related with the soil pressure around the pile,the time effect analysis of the soil pressure around filling pile has great significance to the study of the filled pile’s vertical bearing capacity variation mechanism.

Key words:radial soil pressure around pile; creep; genetic integration; bearing capacity of filling pile