Abstract It is inevitable for the construction of subways to pass under existing structures in city; this will cause settlement and affect their safety. The soil a complex mixture, hence it difficult determine damage caused by using tunnel boring machine (TBM) method stress balance surrounding soil. Normally, uplift surface are during tunneling . Therefore, large-scale 3D simulations needed stu...

Knowledge of the airflow distribution inside a Tunnel Boring Machine (TBM) can create a safe working environment for workers and machinery. The airflow quality and the related mass flow rate in the ventilation system should be sufficient to dilute gases and remove dust inside the tunnel. In this work, airflow distribution in the single shield TBM tunnel was studied using computational fluid dyn...

Microtunneling is a trenchless construction method that is highly adequate to install pipelines beneath roads, rail roads, dams, harbours and environmentally sensitive areas. Microtunneling could be understood as a remotely-controlled, guidance operation of a MicroTunneling Boring Machine (MTBM), where references are provided by a human operator from the surface. A review of current technologie...

1. SOLID MODEL The main aim of the 3D design is to obtain a system that is very close to the real model considering the imposed functional conditions. In the machine tool design the parts are calculated for a proper strength and the stress level in each part is imposed to do not exceed material accepted values. A machine tool, particularly one that is used for drilling and boring processes (Fig...

Successful application of a TBM in a project requires investigating both the ground conditions and the machine and backup system design features. Prediction of the machine performance is very important as it has a big effect on the duration of the project and the costs. In this respect, both penetration rate and advance rate must be estimated. Utilization factor, which depends on the type of op...

successful application of a tbm in a project requires investigating both the ground conditions and the machine and backup system design features. prediction of the machine performance is very important as it has a big effect on the duration of the project and the costs. in this respect, both penetration rate and advance rate must be estimated. utilization factor, which depends on the type of op...