Abstract:

 Construction ventilation is one of the most important aspects in the construction organization design of extralong tunnels and plays a key role for the successful completion of the extralong tunnels. Taking No. 5 inclined shaft working lot of Lvliangshang extralong railway tunnel as example, the authors present the features of the multiworking face construction of the long inclined shaft and the main tunnel, propose designed construction ventilation schemes and deduct the required air volume and the ventilation fan arrangement manner so as to select the reasonable ventilation scheme. Furthermore, regarding the features of the construction ventilation of the working lot, the authors make some recommendations.