Design and Monitoring Analysis of Ventilation Scheme of High Gas Long High-speed Railway Tunnel
The Baiyunshan tunnel of Chengdu-Zigong high-speed railway has a total length of 13 340 m.The ventilation problem of multi-work area and multi-stage construction of long high gas tunnel seriously restricts the tunnel operation and construction and personnel safety.The ventilation of different working areas was calculated through the maximum air volume,maximum air supply volume and air pressure loss along the way.The ventilation scheme of single working area and the overall tunneling sequence were designed.The water and air separation method was used to treat groundwater and the automatic safety monitoring system was used to monitor the gas concentration in the tunnel in real time.The analysis shows that during most of the construction time,the gas concentration of the 2#～6# inclined shaft is low,which indicates that the reasonable ventilation scheme and the penetrating sequence of the working area can effectively reduce the gas concentration of the tunnel.The water gas separation method is used to treat the groundwater and discharge the groundwater and gas respectively,which can further reduce the gas concentration in the tunnel.The monitoring system timely alarms the abnormal gas emission of 2#,3# and 6# inclined wells and power off protection,which ensures the progress of tunnel construction and personnel safety.A set of complete ventilation monitoring design method is established based on tunnel ventilation scheme,through sequence,water and gas separation treatment and gas monitoring for multi-area and multi-stage construction ventilation of long high gas tunnel to provide guidance for similar projects.
extra long high gas tunneltunnel ventilationventilation calculationgas monitoringmain and auxiliary inclined shafts
万方数据
维普
