1. Mechanical calculation model of steel corrugated culvert

At present, the finite element program is generally used to analyze the force and deformation of metal bellows in the design and calculation of steel bellows.

In general, the bellows and the soil are regarded as elastomers, and the bellows are divided into shell elements with four nodes, while the body is divided into solid elements with four nodes.

The boundary condition is that the top surface of the roadbed is a free surface, the vertical displacement of the bottom surface is set as zero, and the horizontal direction can slide.

2, the design load of steel corrugated culvert

The design load of the steel corrugated culvert is composed of dead load and live load. Dead load is mainly the backfill gravity on the steel bellows, while the live load is mainly the load of the cars running on the bridge and culvert.

Due to the high culvert, the proportion of live load is small and can be ignored.

3, steel corrugated culvert basement treatment

The steel corrugated pipe foundation adopts flexible foundation, which directly places the steel corrugated pipe on the sand and gravel cushion layer of a certain thickness.

Under the action of load, the culvert foundation is allowed to have a certain deformation, which mainly considers whether the allowable bearing capacity of the foundation and the settlement value of the weak underlying layer can meet the requirements of the high fill subgrade.

In this culvert, the original surface silt layer and the soft underlying layer are replaced with gravel.