Active earth pressure calculation method of two level new structure of cantilever retaining wall

Based on soil plasticity and limit analysis theorythe consideration of the cohesion force on the sliding planethe adhesive force on the interface of between soil and two level structure of cantilever retaining wallthe model of earth pressure was studied.After forcing analysis to horizontal slice element of sliding soil behind the retaining wallthe first order differential equations for active earth pressure on the retaining wall were set up under limit statethen the strength of the limit state earth pressure for retaining wall with mode of translationthe resultant force of earth pressure and its application point were obtained.The results show that the stress distribution of upper and lower part of two level new structure of cantilever retaining wall are observed to present a parabola style and trapezium distribution separately.The maximum and minimum respectively occurred in the bottom and middle of retaining wall.Thenthe deformations of retaining back and stresses of backfill were analyzed by elastoplastic numerical calculation model to simulate construction conditions.The numerical analysis results indicate that unloading effect about two level new structure of cantilever retaining wall is obvious.It is also proved that the gravitational stress is fully utilized and the stress distribution under limit state has a satisfying agreement with the simulation numerical.