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...

Abstract The application of appropriate excavation equipment in difficult grounds is crucial importance and consequently improves the performance hard rock Tunnel Boring Machines (TBMs). cutterhead one main components TBMs which directly involved process, its design can highly affect cutting efficiency, overall balance head, bearing long term, wear whole face muck buckets. This paper mainly foc...

Mechanical methods of tunnel excavation are widely used because their high output, and the selection appropriate technology depends on ground composition project-related features. Compared with boring machines (TBMs) roadheaders, mechanical pre-cutting in widening have proven to be reliable capacity expansion. other machines, characteristics not systematically analyzed rare use. In this study, ...

Purpose Tunnel construction using a tunnel boring machine (TBM) entails precise machine positioning and guidance in the underground space. In contrast to traditional laser-based machine guidance solutions, the proposed research aims to develop an automation alternative to facilitate TBMguidance and as-built tunnel alignment survey during tunnelling operations. Method A fully automated system is...

The lining structure of Tunnel Boring Machine (TBM) excavated tunnels is composed of series of precast Reinforced Concrete (RC) pieces which are called segment. At the present paper, a novel method is introduced for seismic retrofitting of segmental tunnels located at active fault zones in rock environment with case study of Amirkabir dam to Tehran water transfer tunnel (Karadj tunnel). The mai...

This article refers to:RETRACTED ARTICLE: Modelling and simulation of surfacing welding remanufacturing for tunnel boring machine disc cutter