In a novel shield tunneling method, the tunnel lining is produced by an extrusion process with continuous shield advance. A robotic manipulator is used to build the tunnel supporting formwork, consisting of rings of steel segments. As the shield of the tunnel-boring machine advances, concrete is continuously injected in the space between the formwork and the surrounding soil. This technology re...

the conventional tunneling procedures for example drilling, charging, blasting, loading and supporting, are highly developed. new tunneling machines have recently come into operation and others are under construction or development. impactors are used in large numbers in the coal mining industry. face-heading machines are successfully used in new tunneling procedures in both soft and medium-har...

clogging occurs during mechanical tunneling with a tunnel boring machine (tbm) because of adhesion of clayey soils to the cutterhead and conveyor system. the present study examined the effects of water and sand contents on clogging in montmorillonite clayeysoil. testing was carried out using an adhesion test device on 28 samples with different water and sand contents to determine adhesionstress...

Utility construction projects have great opportunities for simulation applications in construction. This paper describes the special purpose tunneling simulation template developed based on the tunneling operations performed at the City of Edmonton Public Works Department for shielded tunnel boring machines. The tunneling operations are described, then the tunnel template and its components are...

In every tunnel boring machine (TBM) tunneling project, there is an initial low production phase so-called the Learning Phase Period (LPP), in which low utilization is experienced and the operational parameters are adjusted to match the working conditions. LPP can be crucial in scheduling and evaluating the final project time and cost, especially for short tunnels for which it may constitute a ...

The present study compares and analyzes three risk analysis models that are applicable to shield tunnel boring machine (TBM) tunneling, thus proposes an improved matrix model based on the causal networks sustainable projects. advantages disadvantages of compared, structured by analyzing relationship between factors events. Based comparison results, network-based (CN-Matrix model), which complem...

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...

Clogging occurs during mechanical tunneling with a Tunnel Boring Machine (TBM) because of adhesion of clayey soils to the cutterhead and conveyor system. The present study examined the effects of water and sand contents on clogging in Montmorillonite clayeysoil. Testing was carried out using an adhesion test device on 28 samples with different water and sand contents to determine adhesionstress...