On roadbed strengthening in the sixth speedup of Jing-Guang line;

This thesis, as a part of a research project sponsored by Beijing Railway Bureau titled “The design proposal of the technical equipment for strengthening the roadbed against hazards in speed-lift area”, has completed the optimized design of a vibratory extracting-driving piling machine for roadbed strengthening.

Topology optimization of reinforced subgrade body at transition section between bridge and road;