Simulation Analysis of Critical Ventilation Velocity for Vehicle Fire in Large Cross-Section Road Tunnel

The smoke characteristics of tunnel fire are preliminarily concerned with the heat release, the tunnel geometry, smoke outlet geometry, etc. However, the study on smoke characteristics of tunnel fire with different cross passage interval is relatively less at present. Base on the physical model of a large scale cross-section road tunnel, this paper carried out simulation and analysis on the smoke flow of several fire scenarios under different cross passage interval through FDS 5.4.3. The results demonstrated that in a certain extent while the cross passage interval was less than 400m, the longer the cross passage interval was, the longer the time when the smoke began to counter flow in the tunnel and the longer the length of counter-flow smoke. If the cross passage interval was beyond this scope, the time that the smoke began to counter flow and the length of counter-flow smoke tended respectively to be the same.

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Numerical Simulation Analysis and Engineering Applications on the Double-Side-Wall Heading Step Bench Excavation of Large-Cross Section and Shallow Tunnel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.594-597.1182 ◽

2012 ◽

Vol 594-597 ◽

pp. 1182-1187

Author(s):

Wen Hua Li ◽

Da Jun Zhao ◽

Shi Sheng Zhou

Keyword(s):

Numerical Simulation ◽

Cross Section ◽

Simulation Analysis ◽

Phase 1 ◽

Side Wall ◽

Large Cross Section ◽

Step Method ◽

Urban Rail ◽

Shallow Buried Tunnel ◽

Wall Method

With the pace accelerating of development of urban rail traffic in large and medium-sized cities, urban subway and railway lines need to construct shallow and large-cross section tunnels and especially large-cross section tunnels. Large-cross section tunnel constructions make big influence on the surrounding buildings, roads and environment. How to build underground tunnel fast and safe in the downtown has become an problem which needs to be solved urgently. This article is for the technology of city large-cross section and shallow buried-tunnel, relying on the phase 1 of rail transit no.2 in Changsha, which combined with construction characteristics of the excavation method, double-side-wall method and step method, numerical simulation analysis on influence of the large-cross section tunnel disturbance in the surrounding rock, and provides the necessary technical support.

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Coupled Supporting of Rock Bolt and Anchor Cable in Large Cross-Section Roadway

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.1417 ◽

2012 ◽

Vol 256-259 ◽

pp. 1417-1421 ◽

Cited By ~ 2

Author(s):

Ren Liang Shan ◽

Zhen Ting Wei ◽

Xiang Song Kong ◽

Ji Jun Zhou ◽

Yan Liu

Keyword(s):

Plastic Zone ◽

Cross Section ◽

Simulation Analysis ◽

Site Investigation ◽

Large Cross Section ◽

Anchor Cable ◽

Coal Roadway ◽

Section Size ◽

Comprehensive Comparison ◽

Roadway Deformation

With development of coal mining technology and equipment, the coal roadway section size increases gradually, making roadway more difficult to support. In the paper, the supporting of large cross-section roadway in Hedong mine is studied and roadway excavation supporting process is simulated by FLAC3D. Coal roadway deformation and the problem of original supporting scheme are analyzed including displacement field, stress filed and plastic zone. Several supporting optimizations are proposed combined with site investigation and simulation analysis. And the optimizations are simulated and calculated. By comprehensive comparison, the optimal supporting scheme is obtained and some supporting law in large cross-section roadway is concluded. These are helpful for supporting design in future.

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