The negative friction force has a close relation with soil qualit.

After performing the inverse Laplace transform,the variations of negative friction force and the dissipation of the pore pressure in the time-space domain for a pi.

Calculation of negative friction resistance of pile foundation in collapsible loess region;

The strata melts to sink,and producing strata to press newly,the negative friction resistance is produced around the venical pit.

Design of negative friction of pile foundation and its application;

By applying theories of Fuzzy sets,proposal is offered of an analytic method of Fuzzy inversion of negative friction on shafts through de watered subsiding grounds.

Another procedure was compiled based on the load transfer function method to calculate the negative friction on the displacement pile which was induced by the soil reconsolidation around the pile.

Discussion on negative frictional force of big-diameter pile and its shape & properties;

On the basis of testing results,the authors analyse the reasons of shaft lining fracture,such as excessively practical frozen pressure and unfavourable influence of the negative frictional force,and put forward some of the methods which could be used to prevent shaft cining fracture.

Model tests on negative skin friction of rectangular closed diaphragm wall foundation;

Field tests on negative skin friction along piles caused by seismic settlement of loess;

Numerical simulation of negative skin friction on single pile in multiple layer deposits;