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...

numerical analysis of longitudinal and transverse surface settlement induced by epb tunneling- a case study: shiraz subway tunnels reza rahmannejad; mahdi esfandiary; eshagh namazi; hamed jamshidi             determination of the racking reduction factor for an incomplete ellipse shaped tunnel considering the soil-structure interaction mohammad reza momenzadeh; mohammad reza mansoori; armin azi...

The Chamshir water conveyance tunnel (CWCT) with a length of 7.4 km and boring diameter of 5.3 m is excavated using a refurbished single shield TBM, initially designed to work in hard rock formations. This study focuses on engineering geological issues, which are important for checking the suitability of this machine and proposing required modifications for improving its performance in soft roc...

Original scientific paper Aiming at answering the questions of wear and failure of hob in the rock breaking process, the rock breaking process was simulated in different broken rock conditions by using finite element method. The relationship between normal force, lateral force, rolling force and time was obtained by rock breaking simulation analysis on the single edge disc cutter. The rock stre...

Timely and reasonable matching of the control parameters geological conditions rock mass in tunnel excavation is crucial for hard boring machines (TBMs). Therefore, this paper proposes an intelligent decision method main TBM based on multi-objective optimization efficiency cost. The objectives are to obtain most important machine, determine objective, establish objective function. In study, muc...

Tunnel construction method using a tunnel boring machine (TBM) is commonly adopted for building underground infrastructure, such as railways, roads, sewers, or utility pipelines. TBM tunnelling entails precise guidance of the machine in the underground space, as well as effective construction management and project control. The research aims to address critical engineering and management proble...

Excavation load prediction is of great importance for the prior design and latter performance evaluation tunnel boring machines (TBMs). In this paper, an improved model developed based on classical Colorado school mines TBMs equipped with constant cross-sectional disc cutters. The typical structure principle are introduced to predict single cutter force, total group calculated by defining equiv...

• Potential for AI techniques to detect clayey clogging in pipejacking is explored. Data decomposition into feature-based sub-series accentuates their features. The use of slurry density, torque and speed can be useful detecting clogging. ‘Clogging’ a common issue encountered during tunnelling soils which impede tunnel excavation, cause unplanned downtimes lead significant additional project co...

AIMS To study the relation between lung function decrease and cumulative exposure to dust and gases in tunnel construction workers. METHODS A total of 651 male construction workers (drill and blast workers, tunnel concrete workers, shotcreting operators, and tunnel boring machine workers) were followed up by spirometric measurements in 1989-2002 for an average of six years. Outdoor concrete w...