Abstract As a mature technology, the middle partition wall made of the concrete is generally used for pilot head? ings with the purpose of ventilation. However, it comes with various shortcomings, such as rough surface, complex technics and uncontrolled construction progress, making it difficult to be applied to tunnel projects with complex air ducts. Taking the No. 1 inclined shaft of East Tianshan Tunnel as the background, this paper proposes an energysaving and fully-assembled construction technology for the partition wall made of the steel corrugated plate, and verifies its application feasibility in a single-tube four-duct inclined ventilation shaft through numerical simulation and theoretical calculation. The results show that using the partition wall made of the corrugated steel plate, it increases the effective ventilation sectional area of the inclined shaft and reduces the sectional wind speed by about 5.3%, while also significantly reducing the on-way ventilation resistance along the inclined shaft, which is only about 17% of the ventilation resistance of the existing concrete partition wall scheme. Also, the vault deformation and structure stress of the secondary concrete lining are far below the limits regarding the structural safety. This technology overcomes the shortcomings of traditional partition wall made of reinforced concrete, and improves the tunnel construction environment while meeting the requirements for tunnel ventilation and disaster prevention. Furthermore, the construction time can be shortened to one-third of the existing scheme.
Abstract：
As a mature technology, the middle partition wall made of the concrete is generally used for pilot head? ings with the purpose of ventilation. However, it comes with various shortcomings, such as rough surface, complex technics and uncontrolled construction progress, making it difficult to be applied to tunnel projects with complex air ducts. Taking the No. 1 inclined shaft of East Tianshan Tunnel as the background, this paper proposes an energysaving and fully-assembled construction technology for the partition wall made of the steel corrugated plate, and verifies its application feasibility in a single-tube four-duct inclined ventilation shaft through numerical simulation and theoretical calculation. The results show that using the partition wall made of the corrugated steel plate, it increases the effective ventilation sectional area of the inclined shaft and reduces the sectional wind speed by about 5.3%, while also significantly reducing the on-way ventilation resistance along the inclined shaft, which is only about 17% of the ventilation resistance of the existing concrete partition wall scheme. Also, the vault deformation and structure stress of the secondary concrete lining are far below the limits regarding the structural safety. This technology overcomes the shortcomings of traditional partition wall made of reinforced concrete, and improves the tunnel construction environment while meeting the requirements for tunnel ventilation and disaster prevention. Furthermore, the construction time can be shortened to one-third of the existing scheme.
ZHAO Wei1,
2 ZHANG Ke1,
2 GUO Chun1 etc
.Application of the Middle Partition Wall Made of the Steel Corrugated Plate in Inclined Ventilation Shafts of Extra-long Highway Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 132-140
2022, Vol. 59 