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...

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 ...

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...

Abstract Ansys software is used to simulate the welding process of boring bar new cylinder head machine. The indirect coupling method analyze temperature field, then stress field and deformation. It found that for double support structure, highest occurs at outer stiffened plate small diameter end, lowest both ends inner structure. deformation whole structure mainly comes from axial deformation...

The rapid development in the economy and urban population cities Vietnam recent years leads to dramatic growth traffic congestion, noise air pollution, environmental degradation. Urban underground infrastructure thus becomes an inevitable solution since surface space too expensive restricted spite of high cost tunnel construction. However, tunnelling deltaic areas, particular cases Mekong Delta...

One of the main issues involved during tunnel construction with tunnel boring machines is the tail gap grouting. This gap is between the external diameter of tunnel lining and the excavation boundary that is filled with high-pressure grouting materials. In this work, three different approaches of gap grouting modeling in the FLAC3D software are investigated with a special attention to the...