| The interaction between the existing structure and the foundation has always been a kind of problem which is often studied in the engineering field.The essence of the interaction between the structure and the foundation is the problem between the existing structure and the infinite domain(infinite plane,semi-infinite plane,etc.).This kind of problem mainly comes down to the field of geotechnical engineering,such as the dynamic response of structure and foundation,the static and dynamic response of underground structure,the mutual response of tunnel and surrounding rock,etc.In addition,it is also involved in civil and marine engineering.Therefore,the key to solve this kind of problem is to simulate the infinite domain accurately.Infinite element method is an effective method to simulate the infinite domain by mapping the finite domain problem in the local coordinate system to the infinite domain in the global coordinate system.The main research of this paper is that based on the existing theoretical accurate solution of shallow buried tunnel.Moreover,the experimental results of the actual project of shallow buried porous tunnel.Meanwhile combined with the finite element theory and infinite element theory for analysis and comparison.The main method is numerical simulation,through the infinite-finite element modeling under the same conditions,and then the corresponding numerical analysis and comparison,with charts,clouds Graph and other intuitive forms show the advantages of infinite element method.(1)This paper analyzes the division basis of the deep and shallow tunnel.The surrounding rock stress state during the construction of the shallow tunnel.Moreover,the basic principle of the relevant theoretical solution of the shallow tunnel.In addition,gives the infinite element used in this paper and its corresponding theoretical formula,and the key points of the implementation of the infinite element simulation in ABAQUS.(2)Based on the complex function theory which analysis of plane problem,the theoretical analysis of shallow single-bore tunnel under the action of self-weight and external load.The finite element and infinite-finite element models of shallow single-bore tunnel under the same conditions are established respectively by ABAQUS software.The stress and displacement of surrounding rock and the exact theoretical solution are compared and analyzed.In order to verify the infinite element Compared with the finite element simulation,the boundary of the finite element model is closer to the theoretical solution of the shallow single-bore tunnel,which proves the high accuracy of the infinite element simulation.(3)Based on Schwarz Alternating Method and complex function analysis of deep buried double-hole tunnel.This paper briefly reviews the analytical solution of shallow buried double-hole tunnel under the action of self-weight and external load.Moreover,establishes the finite element and infinite-finite element models of shallow buried double-hole tunnel under the same conditions based on ABAQUS software.Moreover,analyzes the influence of spacing and included angle of near shallow buried double-hole tunnel on stress and displacement of surrounding rock of tunnel.The results are fitted with the results of the exact solution,and the problems of the infinite element method in the analysis of the excavation simulation of the shallow double-hole tunnel are further studied.At the same time,the foundation for the subsequent analysis of the shallow multi-hole tunnel is laid.Through the infinite-finite element numerical simulation method,In the process of the change of the distance between the double-hole tunnel from 1 m to 10 m,the influence on the surface settlement of the shallow double-hole tunnel is analyzed.In addition,the influence on the surface settlement of the shallow double-hole tunnel is analyzed when the angle between the two tunnels changes from 0 ° to 90 °.(4)Based on the test data of Yuexiu Park subway station.The actual project of shallow buried and concealed excavation three-hole tunnel.The finite element and infinite-finite element models of shallow buried parallel three hole and cross tunnel under the same conditions are established respectively by ABAQUS finite element software.Moreover,six working conditions are defined to analyze the displacement of surrounding rock.Internal force of lining support and ground settlement under different working conditions compared with the results of the test simulation data.The results of the charts and stress nephogram are compared and analyzed.It is verified that the infinite-finite element method has higher accuracy than the finite element numerical simulation.Moreover,is more suitable for the structural stability analysis of the actual tunnel project.The reasonable construction process of the shallow buried porous tunnel in Yuexiu Park station is verified by the infinite element simulation method. |
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