The vibration impact force from the long-term operation of a subway affects comfort residents living above superstructure and settlement deformation tunnel foundation. A method for evaluating dynamic responses superstructure–tunnel systems is important, especially because randomness force. coupling effect train-vibration excitation nonlinearity geotechnical properties that are subjected to acti...

Water inrush seriously restricts the safe construction of a karst tunnel. Once it occurs, will cause serious consequences such as economic loss and casualties. Due to complexity an underground environment, is difficult calculate probability tunnel water inrush. Therefore, great engineering significance establish effective risk assessment model. Based on Bayesian theory, interpretation structure...

there are various parameters that affect stability and expansion of failure zones in under pressure tunnels. among the important parameters that affect failure zones around the tunnels are cohesion and internal friction angle of the rock mass. in addition, the cross sectional shape is the considerable point in failure distribution around the tunnels. the stress analysis method is one of the app...

Abstract Stability of large underground structures depends on not only rock mass conditions but also excavation stages and support systems. In addition, complexity geological interaction with in situ affect the performance design. The Akyazı tunnel (Trabzon, Turkey) is 2478 m long was designed as 3 lanes double tubes, number at junction part increases to 5. Tunnel cross-sectional area from reac...

the evaluation and control of the trains induced vibrations needs even more attention in the case of underground tracks which passes near to monuments and historical sites. the rail corrugations which occur due to the wheels’ impulse loads during the operation period of underground railway tracks, usually amplify the ground borne noise and vibration. in the current study, the mentioned phenomen...

The construction of new tunnels above existing has become increasingly common to optimize underground space utilization. However, such may pose potential engineering hazards due cracking in the secondary lining lower tunnel. This study investigates occurrence and evolutionary characteristics longitudinal cracks tunnel during upper adjacent pre-existing Our findings demonstrate that a significan...

Rockburst disasters frequently occur in deep tunnels excavated by TBM (tunnel boring machine) under complex geological conditions western China. Using FLAC3D, the characterization of a three-dimensional numerical model compound stratum tunnel is conducted, based on water transport project Shanxi Province. Then, characteristics rockburst hard and soft are revealed, energy criteria considering ro...

Highway tunnel group has the characteristics of large span and small spacing, load distribution surrounding rock between each section are complex. Based on geological prospecting data numerical analysis software, stress along characteristic profile were obtained. Taking Shenzhen Nanlong complex interchange project as an example, results show that (1) excavation area Qiaocheng main gradient is l...

With the large-scale construction of city subways, the down traversing formed by subway running tunnels through the existing railways or railway yards are increasing day by day. Down traversing in shield method becomes common; however, the engineering cases which can be referable in the down traversing formed by the shallow-buried excavation of double-arch tunnels through the existing railways ...