Numerical Investigation of Particle Concentration Distribution Characteristics in Twin-Tunnel Complementary Ventilation System

Abstract

Longitudinal ventilation systems are commonly installed in new tunnels. In this paper, based on the similarity law, the scale model with a view to different conditions is carried out to study the effectiveness of twin-tunnel complementary ventilation system. The system can offer enough amount of fresh air to meet requirement of driving safety by using longitudinal ventilation without ventilation shaft. Field measurements were also performed to validate the numerical model. Results reveal that particle concentration distribution is influenced by the distance from air interchange cross-passages to uphill tunnel inlet (Lex) and the flow volume of air interchange cross (Qex) passage and jet fan thrust (Pjet) in tunnel. And Lex is the most important factor about influencing the ventilation efficiency.

Methane explosion accidents of tunnels in SW China

“…From the technical perspective: (1) Construction ventilation facilities must be in place. It's crucial to strengthen the ventilation technology of methane tunnel, so that the gas concentration in the tunnel can be maintained at a lower value (Pang et al 2014a(Pang et al , 2014bRen et al 2018aRen et al , 2018bRen et al , 2018cHu et al 2019). (2) In advance geological prediction of the tunnel, the distribution of coal seam, the possible position of methane and the judgment of dangerous grade must be accurate.…”

Road Tunnel Axial Fan Performance In Situ Test: Taking Qinling Zhongnan Mountain Highway Tunnel as an Example

“…The air velocity at the centroid of each small part was measured, and their arithmetic mean was regarded as the mean air velocity of the section. Similar method was performed by Wang et al [24,25], Fang et al [26], and Ren et al [27] during the ventilation performance testing of a complementary ventilation tunnel. Compared with the single point measurement, these multipoint experiments were more accurate.…”

Characteristics of Unloading Creep of Tuffaceous Sandstone in East Tianshan Tunnel under Freeze-Thaw Cycles

“…Scheme. Tunnel engineering safety is related to many factors [45,46]. In an actual engineering environment, rock is typically under three-dimensional stress.…”