In this paper, a practical project of subway tunnel lining demolition via blasting for the construction station under action load and weight collapsed rock mass was proposed. The overbreak underbreak quality, failure mechanism structure, particle peak velocity (PPV), stress evolution law surrounding caused by were researched using LS-DYNA. Firstly, results show that parameters presented in pape...

Technological progress in tunneling has led to modern and efficient tunneling methods in vast underground spaces even under inappropriate geological conditions. Identification and access to appropriate and sufficient geological hazard data are key elements to successful construction of underground structures. Choice of the method, excavation machine, and prediction of suitable solutions to over...

BACKGROUND With an increasing proportion of the population living in cities, mass transportation has been rapidly expanding to facilitate the demand, yet there is a concern that mass transit has the potential to result in excessive exposure to noise, and subsequently noise-induced hearing loss. METHODS Noise dosimetry was used to measure time-integrated noise levels in a representative sample...

The regulation of the subway line traffic is a domain where human controllers must deal with a huge quantity of knowledge pieces more or less implicit in the regulation itself. When an incident occurs on a subway line, the operator--the controller who has currently the responsibility of the subway line--must choose the best strategy to apply for moving from the incidental context to the operati...

Environmental particle exposure, often estimated as the particulate mass of particles with a diameter <10 microm, <2.5 microm or <1 microm (PM(10), PM(2.5) or PM(1)), is known to have a negative impact on the health of the population. Little is known about how the size and origin of particles influence the effects. We have previously shown that exposure to a road tunnel environment causes a cel...

According to the Canadian Urban Transit Association (CUTA), 140 Billion CAD is required to maintain, rehabilitate, and replace subway infrastructure between 2010 and 2014. The current practice adopted by transit authorities for prioritizing subway stations for rehabilitation is based on the station structural needs. While this classification is reflective of station condition, other factors, su...

The New York City (NYC) subway is the main mode of transport for over 5 million passengers on an average weekday. Therefore, airborne pollutants in the subway stations could have a significant impact on commuters and subway workers. This study looked at black carbon (BC) and particulate matter (PM2.5) concentrations in selected subway stations in Manhattan. BC and PM2.5 levels were measured in ...

(...) We examined the microbiological composition and abundance in space and time of bioaerosols collected in the Barcelona subway system during a cold period. (...) Multitag 454 pyrosequencing of the 16S rRNA gene was used to assess bacterial community composition and biodiversity. The results showed low bioaerosol concentrations regarding the targeted microorganisms, although the bacterial bi...

In order to examine the cognition behaviors of the physical disabled in the spatial environment such as subway system, we implemented the on-site eyetracking experiment in the real subway environment. We hired 12 physical disabled people who sit on the wheelchairs and conducted certain experiment at National Library Station, Beijing Subway. By using SMI-HED eye tracker, we collected physiologic...

Train-induced unsteady airflow (TIUA) has a great effect on the ventilation and thermal environment of subway line. Track area, connecting tunnel with station, is source TIUA acting station. Exploring characteristics track area contributes to utilizing for improving station environment. In this study, 1D numerical model according an actual line was established by IDA Tunnel software, analyse ra...