3-D Nonlinear Numerical Analysis to study the Performance of Twin Tunnel System

Document Type : Original Article

Authors

1 Ph.D. Student, Civil Engineering Department, Military Technical College, Cairo, Egypt.

2 Assistance Professor, Civil Engineering Department, Military Technical College, Cairo, Egypt.

3 Professor, Civil Engineering Department, El-Azhar University, Cairo, Egypt.

4 Ph.D. Lecturer, Civil Engineering Department, Military Technical College, Cairo, Egypt.

Abstract

Abstract: Tunneling in loose soil is a sophisticate process leading to unexpected collapse for surface and subsurface structures. However, it is necessary to investigate the geotechnical problems related to tunneling. Tunneling process needs to more engineering insight analysis. Several numerical analyses have been conducted to model the soil-structure interaction behavior. However, this study presents a case history along El-Azhar road tunnels. In the present study, the finite element model (FEM) is proposed to predict the performance of the tunnel system under the twin tunnel construction. The case history presented and discussed in this study gives a rare opportunity to understand the performance of the tunnel system. The constitutive model for this analysis utilizes elasto-plastic materials. A yielding function of the Mohr-Coulomb type and a plastic potential function of the Drucker-Prager type are employed. A linear constitutive model is employed to represent the tunnel liner. The response of El-Azhar road tunnels system is described and presented to investigate the ground movement caused by tunneling. The ground movement is calculated using 3-D finite element analysis (FEA). The results obtained by the 3-D nonlinear numerical model are compared with those obtained by the field measurement to assess the accuracy of the proposed 3-D FEM. A good agreement between the results obtained by the 3-D FEA and those by the field measurements was obtained.

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