Abstract：
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. Appropriate 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.
2013, Vol. 50 