The transport network in many countries relies on extended portions which run underground in tunnels. As tunnels age, repairs are required to prevent dangerous collapses. However repairs are expensive and will affect the operational efficiency of the tunnel. We present a decision support system (DSS) based on supervised machine learning methods that learns to predict the risk factor and the res...

AIMS To assess hazards associated with exposure to dust in the London Underground railway and to provide an informed opinion on the risks to workers and the travelling public of exposure to tunnel dust. METHODS Concentrations of dust, as mass (PM2.5) and particle number, were measured at different underground stations and in train cabs; its size and composition were analysed; likely maximal e...

Tunnels and foundation pits are two separate types of excavation that frequently used in urban settings. Excavating tunnels sequentially around existing pile foundations is becoming more prevalent as underground space utilization rates increase. The deformation load transfer mechanisms the group under asymmetric conditions “first tunnel, then pit” pit, tunnel” studied from perspective relative ...

T he London Underground was for decades the envy of every capital city in the world. Forty year old trains were powered by electricity from a polluting oil fired power station. Tobacco smoking was permitted at stations and in some carriages. Levels and composition of dust on The Tube had been measured, and found to contain a variety of toxic substances including quartz from brake blocks, but co...

INTRODUCTION Estimating groundwater inflow into a tunnel before and during the excavation process is an important task to ensure the safety and schedule during the underground construction process. CASE DESCRIPTION Here we report a case of the forecasting and prevention of water inrush at the Jinping II Hydropower Station diversion tunnel groups during the excavation process. The diversion tu...

Geomechanics and TunnellingVolume 16, Issue 2 Cover PictureFree Access Picture: Tunnelling 2/2023 First published: 14 April 2023 https://doi.org/10.1002/geot.202370201AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text full-text accessPlease review our Terms Conditions of Use check box below share version article.I have read accept...

In the process of urban rail transit construction, underground excavation method is often used in subway station construction. Based on a large number measured data Qingdao Metro Line 3, this paper analyzes and studies ground subsidence law long-span shallow buried station. The research results show that vertical surface settlement will be caused by both sides guide hole, but relatively small, ...

Underground traffic tunnels serve as the entry and exit buildings for underground spaces. Most of ventilation air-conditioning systems in spaces rely on cooling or preheating to save energy. The temperature distribution has always attracted attention researchers. In this study, a heat transfer model tunnel was established based energy conservation boundary layer theory, field test carried out. ...

The B-Factory is a high-energy physics project at SLAC that studies the phenomenon of CP violation from collisions between two stored beams; high energy electrons (HER, maximum 12-GeV) and low energy positrons (LER, maximum 4-GeV). Both the HER and LER are located in an underground tunnel of 2200-m-long circumference with a maximum stored current of 3 A. '-The injector consists of the existing ...