The rapid development of airport construction in western mountain area of China leads to increasing number of high-fill foundations

of which the main features are the large fill volume

high height and the existence of soft quondam foundation under fill. These features also increase the difficulty of post-construction settlement prediction. According to composition characters of high-fill foundations of mountain airport

the post-construction settlement can be divided into the creep deformation from upper coarse-grained filler and the consolidation deformation from lower soft quondam foundation. Firstly

a simplified calculation method to calculate consolidation deformation of soft quondam foundation is proposed on the base of analyzing and comparing existing calculation methods

which can consider construction process

and the calculation result by this method agrees relatively well with the field measurement data. Secondly

by analyzing laboratory test data

it is considered that hyperbolic model is also able to characterize the creep deformation of coarse-grained materials; base on this

another simplified calculation method to calculate creep deformation of upper coarse-grained filler is proposed.