Numerical Simulation Analysis with FLAC3D on Retrofitting and Strengthening of Existing Deep Foundation Pit

Taking a reinforcement engineering about existing foundation pit as the background, the FLAC ^3D is used to simulate the process of construction and pile-anchor supporting system. During the simulation Mohr-Coulomb model is used and contact elements are applied to the interfaces between anchor and soil. According to the measured data and parametric analysis results, the soil parameters are calculated with FLAC ^3D . By using these parameters, the existing supporting deformation under original scheme is calculated. The reinforcement scheme is adopted on the basis of calculation results. The analysis results of the deformation, that were calculated by this model, were generally in agreement with the measured data. Furthermore, the agreement shows that the FLAC ^3D model and analytical method are reliable. And the results of FLAC ^3D numerical simulations can satisfy the need of engineering, so it can be well applied to analyze and predict practical engineering.