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An Analytical Solution for the Internal Force of the Lining Segment in Composite Support System for Tunnels Driven with Combined D&B and Shield Construction Method
(1 School of Civil Engineering, Chang'an University, Xi'an 710061;
2 Department of Geotechnical Engineering, Tongji University, Shanghai 200092)
Abstract Aiming at the composite support system in combined D&B and shield construction method , a basic hypothesis for model analysis is proposed. The initial ground stress is divided into hydrostatic stress component and tension-compression deviatoric stress component. The supporting time and spatial effect of the excavation face are reflected by stress relief coefficients of the surrounding rocks. Using the elastic mechanics theory, the elastic analytical solutions for the bending moment and axial force of the lining segment under unequal ground stresses in two directions are derived. Based on the engineering practice used in a running tunnel of the Shenzhen Metro, the influential characteristics of various parameters such as the rock stress-relief coefficient, lateral pressure coefficient, thickness and elastic modulus of the back filling layer are obtained. It provides theoretical support for the promotion of this new construction method and for the design of lining segmentsin composite support system.
Abstract：
Aiming at the composite support system in combined D&B and shield construction method , a basic hypothesis for model analysis is proposed. The initial ground stress is divided into hydrostatic stress component and tension-compression deviatoric stress component. The supporting time and spatial effect of the excavation face are reflected by stress relief coefficients of the surrounding rocks. Using the elastic mechanics theory, the elastic analytical solutions for the bending moment and axial force of the lining segment under unequal ground stresses in two directions are derived. Based on the engineering practice used in a running tunnel of the Shenzhen Metro, the influential characteristics of various parameters such as the rock stress-relief coefficient, lateral pressure coefficient, thickness and elastic modulus of the back filling layer are obtained. It provides theoretical support for the promotion of this new construction method and for the design of lining segmentsin composite support system.
ZHANG Chang-Guang-1,
Zhao-Jun-Hai-1,
Zhang-Qing-He-2
.An Analytical Solution for the Internal Force of the Lining Segment in Composite Support System for Tunnels Driven with Combined D&B and Shield Construction Method[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(2): 95-100
2014, Vol. 51 