When a new railway line will be constructed along the existing one

in order to control settlements of construction period and post-construction period

and to ensure stability of existing line and the new one

comparative analysis is performed in seven projects with six methods in in-situ test. The results of settlement analysis

stability analysis and consequence analysis of existing line show that dry jet mixing piles are superior to sand well

prefabrication drains and geotextiles in consolidating foundation. Relatively

dry jet mixing pile with short length and small interval has better consolidation effect than the longer length and larger interval one.