The T26 tunnel was designed within the scope of Ankara-Istanbul high-speed railway in accordance with speed 250 km/h. Some serious problems and excessive deformations were encountered during excavation works. caused subsidence on surface Tunnel Boring Machine (TBM) became stuck; therefore, works suspended. Design for re-excavation extracting TBM carried out re-designed by New Austrian Tunneling...

The development of underground spaces in urban centers has attracted significant research attention. Typical excavation methods for areas include the New Austrian tunneling method (NATM) and tunnel boring machine (TBM). NATM is superior terms ease construction economic efficiency; however, vibration noise are often cited as major complaints. In addition to their high initial cost, TBMs require ...

Abstract The mud cake is easily formed during the tunnel boring machine (TBM) excavation in clay soils or rocks containing minerals. Mud will lead to soil disturbance of face, clogging cutterhead and even affect construction efficiency personnel safety. In this study, a discrimination method formation based on temperature was proposed. An online monitoring system designed installed slurry balan...

TBM (tunnel boring machine) hob is the core component of for rock cutting, whose cutting performance can directly determine overall tunneling efficiency TBM. The understanding caused by hobs still not enough due to complex contact features between and rock. To study dynamic process deeply, numerical model built based on SPG (smooth particle Galerkin) method, influence penetration spacing breaki...

A tunnel boring machine (TBM) is an important large-scale engineering machine, which widely applied in construction. Precise cutterhead torque prediction plays essential role the cost estimation of energy consumption and safety operation tunneling process, since it directly influences adaptable adjustment excavation parameters. Complicated variable geological conditions, leading to operational ...

The article considers the problems of magnetic field distribution, generated by a power electric cable at micro-tunnel-boring shield arrangement site numerical modeling with further full-scale device model experiment. impact foreign sources on readings three-component sensors was established in process study. considerable existence parasitic noises, conditioned external fields and high sensitiv...

Boring is a frequently employed finishing operation in machine shops. Boring is a process in which pre-drilled holes or holes in cast, forged or extruded components are enlarged or finished with a cutting tool mounted on a boring bar. The process is mostly used in applications where close dimensional tolerances and good surface finish are required. In this research work based on the theoretical...

Recent studies have increasingly investigated construction methods for tunnel excavation because of growing underground space development. Although the New Austrian tunneling method (NATM)—a representative method—can be applied to various ground conditions, as well having good constructability and economic feasibility, it suffers from problems such vibration noise. By contrast, using a boring m...