#Using flac3d to model triaxial test for clay deformation series
Sand Box (SB) and Pressure Vessel (PV) tests performed on ESS 7 pressure vessel lvdts ESS impermeable. tests conducted on eight specimens of Boulder Clay using the direct shear and triaxial devices. This example simulates a series of triaxial tests which can be used to verify that Modified Cam-Clay constitutive model is functioning properly. 1make sure the a (zone face apply stress-xx a ) has the same order of magnitude with b ( global prepres b) After i modified it, it not. The validity of this new model is confirmed by data from triaxial drained and undrained compression and extension tests for clays with different overconsolidation ratios, true triaxial tests with different Lode's angles, and cyclic loading tests. PEA 182 Large Scale Triaxial Deformation Tests Multi-Operator JIP project to study ESS-formation interaction Total of 11 tests conducted, 9 on ESS, 1 on alternative expandable screen design with pre-drilled base pipe and 1 SAS. Maybe I can share some suggestions for you. Its features include a particular form of nonlinear elasticity and a hardening/softening behavior governed by volumetric plastic strain ('density' driven). excavations through soft and sensitive clay ground at the Osaka Subway Line No.8. Compared with the Cam-clay model, the UH model requires only one additional clay parameter, the slope of the Hvorslev envelope. The modified Cam-Clay model is an incremental hardening/softening elastoplastic model. higher than those commonly obtained from conventional triaxial tests.
Based on the SMP criterion and the corresponding transformed stress method, the proposed model can be applied conveniently to three-dimensional stress states. The key feature of the model is the adoption of a unified hardening parameter that is independent of stress paths. The UH model can model many characteristics of overconsolidated clays well, including stress–strain relationships, shear dilatancy, strain-hardening and softening, and stress path dependence behaviour. A current yield surface is used to describe over-consolidated behaviour, and a reference yield surface to describe the yield characteristics corresponding to normally consolidated clays. Based on the relationship between the current yield surface and the reference yield surface, a new model, called the three-dimensional unified hardening model for over-consolidated clays (the UH model), is proposed in this paper.