Abstract Segmental lining is subject to significant upward buoyancy forces when a grouting material (slurry), initially fluid, adopted fill the gap between its external profile and wall of tunnel excavated with TBM machine. The analysis effects these important in order correctly dimension segmental avoid damage subsequent costly maintenance restoration actions. Given complexity behavior consist...

tehran shomal highway passes through alborz mountains with a tunnel length of 6400 meters. there are two main tunnels. a full three-dimensional (3d) numerical analysis coupled with elasto-plastic material models was conducted on the inclined access tunnel. bending moment, axial force and the lining displacements due to the internal forces applied on the shotcrete lining are calculated. axial fo...

nowadays deep excavations are needed for construction of foundation of high rise buildings, providing space for parking and etc. in some cases deep excavations may be constructed in the vicinity of the subway tunnels and causes unpredicted extra displacements and internal forces in tunnel lining of tunnels which were not designed for them and consequently affect serviceability of tunnel. theref...

To judge about the performance of designed support system for tunnels, structural forces i.e. peak values of axial and shear forces and moments are critical parameters. So in this study, at first a complete database using finite element method was prepared. Then, a model of artificial neural network (ANN) using multi-layer perceptron was developed to estimate lining structural forces. Sensitivi...

We establish an elaborate numerical model with which to investigate the deformation characteristics of segmental lining. The contains reinforcement and connecting bolts that previous studies have generally neglected. validated parameters using a full-scale test result. Based on this model, we studied Convergence, joint deformation, bolt stress, stress were systematically analyzed under differen...

Excavation of shallow tunnels such as subways in urban areas plays a significant role as a life line and investigation of the soil behavior against tunnel construction is one of the vital subjects studied in the geotechnical scope. Nowadays, urban tunnels are mostly drilled by T.B.Ms and changing the applied forces to tunnel lining is one of the most risky matters while drilling tunnels by thes...

Input of sinusoidal excitation with specified frequency is an optimal way to capture the mechanism soil-tunnel interaction. Focusing on relationship between input motions and dynamic response a system, this study carried out series shaking table tests both free-field model soil–tunnel in background tunnel soft ground. To detect detailed deformation segmental linings, refined lining ring was dev...

There are various methods for the analysis of the interactional behavior of the surrounding land, using the lining structure which is the most common method of deigning lining structure tools for the static loads by using the hyper static methods. In recent years, there has been a question that depicts whether this method provides the best results in designing the tunnel structure or not.Due to...

Finite element technique is used to model two phases of tunneling process, namely; excavation and rocklining interaction. The excavation phase is responsible for determining the pre-lining rock mass deformations and the reduced in-situ stresses. The interaction phase models the compatibility of the rock-lining system. The deformations and stresses of the rock-lining system and the final rock ma...