Multi-scale Analysis of Excavation Face Stability based on SPH-FEM Coupling Method
The stability of excavation face often determines whether the excavation can be carried out stably and affects the safety and schedule of the project in project practice.In this paper,smooth particle dynamics(SPH)is used to simulate the large deformation and failure process of soil mass under excavation disturbance,finite element(FEM)is used to simulate non-large deformation soil mass and tunnel structure,and multi-scale method is used to explore the stability of excavation face.The same three-dimensional More-Coulomb constitutive model is used to solve the soil region established by the two methods at the Gaussian integral point to ensure the consistency.The feasibility of this method is verified by calibrating the model test with the stability of excavation face.On this basis,a series of parameter analyses are carried out by using the control variable method,and the change law of vertical displacement and vertical stress,as well as the corresponding change law of displacement field,stress field and equivalent plastic strain field are investigated.Finally,the development of isosettling surface is studied,which proves the reliability of the multi-scale method.This coupling method is a powerful method to study the stability of excavation face,which can reflect the deformation law and failure mechanism of soil well,and provide an effective calculation tool for the study of excavation face stability.
tunnel engineeringstability analysis of excavation faceFEM-SPH coupling algorithmmulti-scale methodlarge deformation calculationexcavation face stability
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