This study demonstrates a three-dimensional numerical simulation of earth pressure balance (EPB) shield tunnelling using coupled discrete element method (DEM) and finite difference (FDM). The analysis adopted the actual size spoke-type EPB tunnel boring machine (TBM) consisting cutter head with cutting tools, working chamber, screw conveyor, shield. For model to reproduce in situ ground conditi...

Microtunneling is a trenchless construction method that is highly adequate to install pipelines beneath roads, rail roads, dams, harbours and environmentally sensitive areas. Microtunneling could be understood as a remotely-controlled, guidance operation of a MicroTunneling Boring Machine (MTBM), where references are provided by a human operator from the surface. A review of current technologie...

A 30.5km railway will soon be completed that links the Northwestern part of the territory with the metro area of Hong Kong. This HK$46 billion investment in the West Rail projects will form a major railway strategic and territorial development for the coming 20 years of Hong Kong. There are nine stations provided within the alignment of the West Rail, 6 of which are located in the northwestern ...

Specific to a problem of large vibro-impact aris ing from the cutting unit of the hard rock tunnel boring machine (TBM), a hybrid magnetic coupler based on soft start was proposed in this paper. The mathematical model for total eddy current losses of such a coupler was established by field-circuit method. Then, magnetic-thermal coupling simulation was performed by virtue of three-dimensional fi...

OBJECTIVE To investigate the performance and effectiveness of 4 classification methods including support vector machine, naive Bayes, classification tree, and artificial neural network in the detection of carpal tunnel syndrome. METHODS This retrospective study was conducted at Yuzuncu Yil University, Van, Turkey, and comprised record of patients suspected of having carpal tunnel syndrome bet...

1. SOLID MODEL The main aim of the 3D design is to obtain a system that is very close to the real model considering the imposed functional conditions. In the machine tool design the parts are calculated for a proper strength and the stress level in each part is imposed to do not exceed material accepted values. A machine tool, particularly one that is used for drilling and boring processes (Fig...

Abstract The intermediate linear cutting machine (ILCM) is a designed to work on an scale between the full- and small-scale. reduced involves several advantages compared full-scale tests, especially in terms of sample supplying transportation. On other hand, it has impact testing conditions, resulting limitation penetration spacing during test, as well smaller disc cutter. This affects most res...

The main objective of this study was to investigate the performance of a roadheader used for the excavation of Küçüksu Sewage Tunnel having a length of 1037.52 m. The tunnel is located in Anatolian part of Istanbul and constructed by STFA for Istanbul Water and Sewerage Administration (ISKI). Detailed statistical analysis showed that net advance rate of the roadheader is directly influenced by ...