摘要
For the path dependency and nonlinearity introduced by incremental construction, numerical method has been widely used in deformation analysis of geo engineering.In the numerical simulation scheme commonly used in the past, the excavating loads are extracted from nodal stresses, which are deduced linearly from the stresses at Gauss point in finite element method.The unneglectable calculation error is contained in this process when elastic plastic constitutive model is employed.The error mentioned above is analyzed in detail.Based on the analysis of excavation process and the principle of finite element theory, a new simulation scheme for excavation is proposed.At the end of this paper, an application in rock engineering is given out.
For the path dependency and nonlinearity introduced by incremental construction, numerical method has been widely used in deformation analysis of geo engineering.In the numerical simulation scheme commonly used in the past, the excavating loads are extracted from nodal stresses, which are deduced linearly from the stresses at Gauss point in finite element method.The unneglectable calculation error is contained in this process when elastic plastic constitutive model is employed.The error mentioned above is analyzed in detail.Based on the analysis of excavation process and the principle of finite element theory, a new simulation scheme for excavation is proposed.At the end of this paper, an application in rock engineering is given out.
