DISPLACEMENT BACK ANALYSIS OF ELASTO -PLASTIC MODEL ON STAGED CONSTRUCTION OF PIT FOUNDATION

摘要

For plastic deformation of soil during the excavation of pit foundation, this paper used elasto-plastic model with Mohr-Coulomb criterion to stimulate construction process, besides, elasto-plastic back analysis technique on staged construction is proposed. With Genetic Algorithm of global optimization, the elastic modules of soils were back calculated with the measured horizontal displacement of D/Wall, then to predict the deformation of D/Wall with back-calculated elastic module. This method was employed to simulate the construction process and predicted the deformation of D/Wall in the subway excavation.