The paper introduces the design, construction method of consolidating weak subgrade by strongly ramming crushed stone pile with major diameter, as well as the construction quality examination of single pile of crushed stone pile and composite subgrade.

Application of large grain-size gravel piles to strengthening saturated super-soft ground;

The application of gravel pile in soft foundation treatment;

Construction technology of vibration sinking tube gravel pile in foundation reinforcement;

Application of gravel pile in dealing with liquefaction foundation;

Analysis on effective radius of gravel piles reinforcement in soft soil foundations based on microstructure;

The application of composite foundation of gravel piles in high-speed railway;

Taking the example of Lan-Shang freeway construction,it introduces the construction technique and quality control measures of reinforcing soft foundation with gravel piles.

Quality control of CFG pile built in crushed stone pile;

Weak liquefaction foundation treated by CFG pile and crushed stone pile;

Exploration of budget norms for additional crushed stone piles;

Quality control of foundation consolidated by vibration and impaction stone column;

Mechanism of composite ground with stone columns and geogrid in wetland

Numerical method combined with field investigation is employed to explore the sliding failure mechanism of Taihua highway embankment during construction,which is built on soft soils and the soft soils are improved with stone columns.