The basis of a possible fire design and verification approach to the linings RC tunnels, using performance-based approach, is presented. Starting from an extensive literature review, selection most relevant tunnel fires was analysed. study structural consequences these real may be considered as experimental data in fire, define damage levels. Back analyses were carried out main parameters contr...

Placement of infrastructure and other facilities underground brings superior opportunities for long-term improvements in terms the environmental impact urban areas more efficient use space. However, construction is a high-risk activity has been considered challenging problem geotechnical structural designers. Therefore, evaluation stability structures plays vital role design. This paper present...

The occurrence state of groundwater in a karst area has significant impact on the tunnel lining structure. is more during construction. This paper used numerical simulation to study grouting reinforcement range Liaoshan Tunnel. was based critical water rich height. Under Grade IV and V surrounding rock, points were 230 m 240 deep, respectively. vertical horizontal stress seepage flow arch crown...

Abstract One of the crucial factors that has gained widespread popularity during tunnelling construction process is face stability tunnel mainly depends upon support pressure to be applied at against overburden and surcharge loading acting on earth surface. In this study, different cross sections tunnels been investigated in cohesionless soil (loose medium dense sand) using Finite Element Analy...

This paper deals with full face excavation of large size tunnels in rock masses of very poor quality which exhibit squeezing problems. Three different time dependent constitutive models of increasing complexity (a viscoelasticplastic model, an elastic-viscoplastic model, and an elastic-plastic-viscoplastic model) are used to analyze the tunnel response during excavation of the Saint Martin La P...

Shield docking technology is widely used in underwater shield tunnels. As the not perfect, instability of tunnel face and stress relaxation segment lining caused by dismantling need to be solved. Using a cross-sea project, reinforcement with steel channel process studied. The longitudinal effect after thrust unloading analyzed, theoretical solution circumferential joint opening, or without rein...

Abstract This paper investigates the stress transferring mechanism of a pressure tunnel strengthened with CFRP. A simplified mechanical model internal water transfer from CFRP to lining concrete is established, and key parameters that influence between are identified. solid-spring-solid three-dimensional finite element established. Using numerical model, influences above on ratios borne by inve...