Abstract: In order to study the mechanical properties of large-sized corrugated steel pipe under high filling， the corrugated steel pipe culvert in AK0+485 of Pinghong highway was selected as research object. The strain， soil pressure， and horizontal and vertical deformation of the pipe were extracted under the condition of different filling heights from field tests and numerical simulation. By data processing and analyzing， test value and numerical simulation have the same change tendency，and the circumferential strain in middle part and axial strain in top part are greater than other parts of the pipe. Soil pressure at the top part is lower and at the bottom 45° part is higher， which is caused by the flexibility of large-sized corrugated steel pipe and restriction of concrete supporting. Simulations show that the stress concentration and soil pressure in every part of the pipe can be decreased under the condition of no concrete supporting.

Key words: large-sized corrugated steel pipe culvert, high embankment filled, mechanical properties, concrete supporting, soil pressure