Abstract Based on the load structure model and the elastic linkage finite element method, the force applied on a double-layer tunnel lining with molded concrete was simulated using a composite beam model. As the contact pressure between the two lining layers is transferred by the radial spring, which can only be compressed, the double-layer molded concrete lining can share the load, whose ratio can be distributed automatically. The calculation results show that the composite beam model has advantages over the traditional methods in terms of the analysis of safety and stability of the double-layer lining with molded concrete and can serve as a new approach for the design and calculation of complex tunnel linings. It is suggested that an elastic coefficient of 500 MPa/m below the haunch and 300 MPa/m between the crown and haunch should be used when the force on the double-layer lining is calculated based on a composite beam model.
Abstract：
Based on the load structure model and the elastic linkage finite element method, the force applied on a double-layer tunnel lining with molded concrete was simulated using a composite beam model. As the contact pressure between the two lining layers is transferred by the radial spring, which can only be compressed, the double-layer molded concrete lining can share the load, whose ratio can be distributed automatically. The calculation results show that the composite beam model has advantages over the traditional methods in terms of the analysis of safety and stability of the double-layer lining with molded concrete and can serve as a new approach for the design and calculation of complex tunnel linings. It is suggested that an elastic coefficient of 500 MPa/m below the haunch and 300 MPa/m between the crown and haunch should be used when the force on the double-layer lining is calculated based on a composite beam model.
LI De-Wu- 1,
2 Yang-Jin-Jing- 1
.Composite Beam Model for the Force Calculation of a Tunnel Lining with Double-Layer Molded Concrete[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(5): 108-113
2016, Vol. 53 