And the average coefficient of permeability is brought in,two analytical solutions about PTIB and PTPB are obtained,and calculating and analyzing through a example,discusses about its effects to the consolidation strength.

Analytical solution for consolidation of composite foundation accounting for variation of soil horizontal permeability coefficient;

The differential governing equations for the consolidation of composite ground with granular columns are established,which can consider the gradual variation of horizontal permeability coefficient of soft soil in a drainage influential zone caused by disturbance during granular column construction.

A general analytical solution is given to the consolidation problem for the composite ground with granular columns under time-dependent loading and arbitrary variation of horizontal permeability coefficient in the soil of drain influence zone with radial distance.

Under the condition of progressive loading,considering a parabolic variation of the horizontal permeability of soil in the disturbed zone and the combination seepage along both radial direction and vertical direction in the surrounding soil,the governing equations for the consolidation of a composite foundation was derived and their solutions were obtained.

In addition,the parabolic distribution of the horizontal permeability of soil in the disturbed zone due to the influence of the column construction is considered too.

OADC with consideration on the gradual variation of horizontal permeabi-lity of soil in disturbed zone is greater than the one without considering the horizontal permeability variation.

By calculating the functions of average permeability in radial compound reservoir and investigation radius, the investigating radius in combining reservoir is developed simultaneously.

The average permeability and initial pressure gradient of every core are obtained through analysis of large amount of data from the mercury injection experiments.