Technologies on Safe Construction Ventilation of Long-large Shield Tunnel with Low Gas in Metro

Abstract

Taking the project of long-large shield tunnel with low gas in Xingtian section of Chengdu Metro Line 18 as an example, A new construction ventilation method is established, which includes: the main tunnel ventilation with axial fans installed at the entrance of the tunnel and the local ventilation with jet fans installed in the shield and at the upper part of the bridge and the top of the 4# trailer for the rear supporting system; the connecting passage ventilation with a jet fan installed on the wall; the crossing ventilation with a jet fan installed in the middle of tunnel. The ventilation technology for safe construction of Metro long-large shield tunnel with low gas is established after detailed calculation of the fan selection, which is applied to finish safely and quickly construction task, and which provides reference for similar projects in the future.

Modeling of the accurate application of the Kernel Efficiency Method in the proportioning process of shield tunnel construction

“…With the continuous improvement of the urban transportation system, rail transportation planning and construction have become an important part of the metropolitan transportation system [1]. The shield method has become one of the main methods of urban underground rail transit construction due to its unique advantages [2]. The construction technology of shield tunneling through existing infrastructure has also become a key control object in engineering construction [3].…”