Key Technology Research into Foam Concrete Lightweight Embankment with Cast-in-Situ Baffle instead of Conical Slope at Bridge-head

Abstract

According to the features of foam concrete of low density, small load on foundation after filling to greatly reduce ground treatment intensity and no need for dynamic compaction or rolling after pouring so that pavement structure layer can be directly laid, in this paper, a construction method was, with inside step-slope on embankment, cast-in-situ concrete baffle structure on the outside of embankment and foam concrete to fill bridgehead subgrade, explored to solve the problem of earth pressure and conical slope setting at abutment as well as optimize abutment to be the structure without conical slope, so as to reduce the span which may be enlarged due to conical slope and greatly cut project cost. At the same time, using this method, settlement and uneven settlement decreased and post-construction settlement of abutment filling was eliminated so as to avoid bumping at bridge-head and reduce maintenance cost.