摘要
文章以北京地铁15号线南法信站—石门站盾构区间右线为工程背景,分析了选择加压开舱技术的理由,提出加压开舱的气压、泥膜和人员等为控制重点要素;论述了加压开舱的原理和工作流程,即根据承压水细中砂地层特点配置适合的泥浆,运用静止土压力理论并考虑土压和水压设定开舱气压,经过一定的流程形成掌子面及周边密封的泥漠,通过在人舱内一定速率的加压和减压,最终完成加压开舱检查刀盘的工作。实践证明,工程中制作的泥漠及设定的压力,有效地控制了土舱内的压力,保证了掌子面和地面的稳定,并且人员的选择、工艺的安排,在很大程度上提高了工作效率、缩短了工期、节省了成本,显现了加压开舱的优点。
Based on the right running tunnel section of the Beijing Subway Line 15 that travels from Nanfaxin to Shimen station, this paper explains the reasons to use hyperbaric intervention; presents the key factors of compressed air pressure, mud membrane and operators; and describes the working principles and procedures involved. Appropri- ate slurry was deployed considering the sand stratum with fine and medium particles. The compressed air pressure was determined by considering earth pressure and water pressure using static earth pressure theory. A sealed mud membrane was formed at the working face and its surrounding area. The setting pressure effectively controlled the pressure in the excavation chamber, guaranteeing the stability of the working face and controlling ground settlement.
出处
《现代隧道技术》
EI
北大核心
2013年第1期154-160,共7页
Modern Tunnelling Technology
关键词
刀盘
加压开舱
气压
泥漠
密封
Shield
Cutterhead
Hyperbaric intervention
Compressed air pressure
Mud membrane
Sealing
