Research on Relationship between Shaft Resistance of Rock-Socketed Pile and Behavior of Around Rock;

Upon the axial static test and resistance distribution tests of large rock socketed piles under loading,the datum of characteristic of tip resistance and shaft resistance and P~S curve are analyzed.

Experimental research on side resistance of precast reinforced concrete piles;

According to the data of static loading test for three over-longs bored piles of a project,the author compare the settlement,the axial force distribution along pile shaft and the side resistance of each pile.

In this paper ,some of the developments about side resistance of socketed pile in weak rock are presented.

Exprimental study on pier’s bearing capacity,tip resistance and lateral resistance;

On the basis of the in-situ test data of large diameter cast-in-place pile in soft foundation,the behavior of vertical bearing capacity, skin friction, and the influencing factors are analyzed.

The load-settlement curves,the development of skin friction and end resistance as well as the distribution of shaft resistance along the pile depth were compared.

Based on the differential equation of vertical load transfer of single pile,and considering nonlinear softening of side resistance force,the expression in increment form was deduced which concerned relation between axial force of pile and displacement of pile relative to soil of pile side.