A new way is proposed to obtain the recommended tabular statistic features of the standard prefabricated piles in Shanghai, and the process to obtain the statistic features of the lateral tensile friction resistance and the end resistance is introduced, as well as the way to calculate the reliability of the prefabricated piles based thereon.

The compressive end resistance and tensile resistances of the plate are compared with each other.

According to the results of self-balanced static load tests,not only base resistances were improved after grouting,but also frictional resistances were improved by bettering the characteristics of soils and interfaces between piles and soils.

The results show that scattered piled foundation produces strong pile shaft friction and base resistance ultimately,so that raft can sustain load efficiently.

Througj analyzing 150 cases of field test results and 2 cases of long-term in-situ observations,somegeneral relationships between the base resistance/pile capacity ratio (Q_b/Q)of rock-socketed pilesunder vertical load and their length/diamter ratio(L/d)are found.

On the basis of three-dimensional finite element method,the lateral friction resistance,the tip resistance and socket length of rock-socketed pile are analyzed and calculated.

By analyzing test data,the vertical bearing capacity,lateral friction and tip resistance of the diaphragm wall foundation were studied.

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.

The paper analyzes the load transfer mechanism of pile-soil system and the influencing factors of boring tech-nology from frictional resistance and end bearing of piles.

The paper confirms the necessity of conducting the plate load test in deep test pit to determine the end bearing of large diameter cast - in - place pile, makes discussions on the essentials of the equipments, test procedure and analysis of data collation.

According to the results of six in-situ pile load tests of boring cast-in-situ piles after grouting at the piles tips and the tress distributions of three of those piles,theirQ-scurves,tress transferring of piles,pile side frictions and pile tip resistances affected by grouting,were analyzed in details.

Based on the results of statical load test of pile and the plate loading test of deep layer,the paper has analysed the tip resistace of an artificial digging hole pile taking gravel sand layer as bearing bed and discussed potentialities of its ground and then the eigenvalue of pile tip resistance is put forward.

By static loading test and field test of loading transmission the influence of slime at pile botton to ultimate bearing capacity, pile tip resistance, side friction of pile are analyzed and effective measures are also proposed.

Mobilization of toe resistance of piles with local displacement in sand;