This paper makes a study of the collapsible characteristics under overburden pressure of the Western Henan loess along Zhengzhou-Xi'an high-speed railway by field experiment. The developing process in the depth of loess collapsibility under overburden pressure and the collapsible horizontal distance have also been analyzed. The results show that: the influence of soaking boundary on collapse is very clear; but collapsible rate shows a slow-fast-slow-until-stable tendency

with 60% of the total settlement immersed for 10 days and 90% for 30 days. The of the site is 1.30

greater than the recommended 0.9 by the code. The results show that the extent of collapsibility of this region is more intense than that of general knowledge. In the site

loess collapse under overburden pressure maximum depth laboratory test value is 19 m; and field test value is 16 m

the former is 1.2 times the latter. The collapsible horizontal distance out of the test pit is 20 m

similar with the diameter of the test pit. Therefore

no water should be kept within 20 m from the embankment toe. The research results have been applied to the Zhengzhou-Xi'an high-speed railway construction

and can be taken as reference for similar projects in this region.