In the case of tunnelling by mining methods, regulations apply to design ventilation. The most important criteria be taken into account when calculating minimum air flow rate in a tunnel are velocity, multiple exchange during one hour, not exceeding permissible concentrations gases and dust, ensuring appropriate climatic conditions. this paper, an analysis ventilation methods is carried out, ta...

Abstract According to the latest physical mechanical parameter of rock, crustal stress, section style and support parameter, rock stability intersection EVT- Ventilation Tunnel 2-1 Shaft 2 is analyzed verified through FLAC3D on base actual geology test value stress.

BACKGROUND AND OBJECTIVE Road tunnels are increasingly important components of urban infrastructure. However, knowledge of their health impact on surrounding communities is limited. Our objective was to estimate the short-term respiratory health effects of exposure to emissions from a road tunnel ventilation stack. METHODS We conducted a randomised cross-over cohort study in 36 volunteers who...

In order to study the freezing front characteristics of alpine tunnels under condition wind flow field and relying on Osaka Mountain tunnel in Qinghai Province, physical model test an was built. By using Surfer software combined with laboratory data, radial longitudinal temperature variation trends were obtained, overall vector graph simulated; evolutionary laws a airflow conditions systematica...

The present study examines the prevailing conditions in a railway tunnel after train fire accident and ability of ventilation system to create proper for safe passenger evacuation. examined scenario included an event 20-MW diesel pool on suburban train, immobilized middle 1.5-Km long, linear shaped rectangular ventilated by longitudinal jet fan system, people’s movement during evacuation was ef...

The purpose of this paper is to evaluate the effects of a building parameter, namely ceiling configuration, on indoor natural ventilation. The computational fluid dynamics (CFD) code Phoenics was used with the RNG k-ε turbulence model to study wind motion and ventilation flow rates inside the building. All the CFD boundary conditions were described. The simulation results were first validated b...

OBJECTIVE The construction of a new road tunnel in Sydney, Australia, and concomitant reduction in traffic on a major road presented the opportunity to study the effects of this traffic intervention on respiratory health. METHODS We made measurements in a cohort of residents in the year before the tunnel opened (2006) and in each of two years afterwards (2007-2008). Cohort members resided in ...

The broiler industry is not immune to the problematic nature of NH3 production in animal rearing facilities. Though the headlines of today focus on environmental impact considerations, the detrimental effects of the house air quality on farmers and birds remain considerable for industry viability. This research investigated the vertical stratification of in-house NH3 combined with sampling posi...