Today, numerical simulation can be used as a suitable tool to measure large quantities that are very expensive and, in some cases, impossible to measure. One of the important issues in predicting rock mass boreability in excavation with full face tunnel boring machines is estimating the discchr('39')s forces for rock cutting. For this purpose, the linear cutting test is  employed. However, limi...

Large-diameter open caissons are an increasingly common means of constructing underground storage and attenuation tanks, as well launch reception shafts for tunnel-boring machines. A ‘cutting face’ at the base caisson wall, resembling inclined ring footing, is typically used to aid sinking phase. This paper describes a suite over 15 000 finite-element limit analyses exploring bearing capacity c...

Since 1850, compressed-air work has been used to prevent shafts or tunnels under construction from flooding. Until the 1980s, workers were digging in compressed-air environments. Since the introduction of tunnel boring machines (TBMs), very little digging under pressure is needed. However, the wearing out of cutter-head tools requires inspection and repair. Compressed-air workers enter the pres...

Information concerning the size and shape of tunnel boring machine (TBM) debris is essential for designing efficient loading, hauling and dumping systems for TBM excavation. It is also very important in deciding how to recycle the TBM debris. However, only very limited information is available at present, and theoretical or calculation methods to estimate the size and shape are still open to di...

Utilization is one of the main managerial factors that is applied for construction process analysis well. It directly affects the project duration and construction costs. Therefore, a utilization study in tunneling projects is essential. In this work, the utilization of an earth pressure balance Tunnel Boring Machine (TBM) in Tabriz urban railway project was studied using the Monte Carlo simula...

Large-diameter open caissons are a widely used construction solution for deep foundations, underground storage and attenuation tanks, pumping stations, launch reception shafts tunnel boring machines. The sinking phase presents number of challenges during construction, including maintaining caisson verticality, controlling the rate minimising soil resistance through use lubricating fluids. This ...

To replace the worn-out cutter of tunnel boring machines timely, it is crucial to inspect cutter’s wear. In this work, a novel detection method based on magnetic force proposed overcome drawback nonlinearity in current detecting technology. The principle that between and permanent magnet linearly decreases with increasing Firstly, investigated by finite element simulation find optimal placement...

The lining system, used in tunnel boring machines, is made of precast concrete segments. use steel fibers this kind support system can not only decrease production time and costs but also improve compressive, tensile as well flexural behaviors. A study has been carried out to examine the mechanical properties segments Tabriz metro line-2 project using three types fibers: 3D, 4D, 5D. Various exp...