同济大学学报（自然科学版）2025，Vol.53Issue(4)：557-564,8.DOI:10.11908/j.issn.0253-374x.23314
土压平衡盾构非满舱气压辅助施工螺旋输送机闭气能力分析
Analysis on Air-tightness Capacity of Screw Conveyor Under Non-full Chamber Compressed-air Assisted Construction of Earth Pressure Balance Shield
摘要
Abstract
This study focuses on the issue of compressed air pressure escaping along the outlet direction of the screw conveyor,which makes it difficult to establish a stable air pressure within the pressure chamber.A gas-water-solid coupling calculation model for compressed air in the pressure chamber-screw conveyor system is developed based on Geostudio Air/w.The effect of compressed air under different air pressures,conditioned soil properties,and empty chamber heights of the shield pressure chamber on the air leakage rate at the screw conveyor outlet is analyzed.The results indicate that the conditioned soil water permeability coefficient and compressed air pressure in the chamber are the two main factors affecting the escape of compressed air in the pressure chamber.Soil conditioning can reduce the water permeability coefficient of conditioned soil,thereby increasing the auxiliary air pressure.When the water permeability coefficient is gradually reduced from 6×10-6 m·s-1 to 6×10-8 m·s-1,the pressure retention capacity increases linearly from 130 kPa to 240 kPa.When the water permeability coefficient is further reduced to less than 4×10-8 m·s-1,the pressure retention capacity of the pressure chamber can reach 300 kPa.The internal structure of the screw conveyor can effectively reduce the escape of compressed air.The air leakage rate without considering the internal structural characteristics of the screw conveyor is seven times more than that when the structural characteristics are taken into account.关键词
土压平衡盾构/气体逃逸/击穿时间/渗气率/渗水系数Key words
earth pressure balance shield/gas escaping/piercing time/air leakage rate/water permeability coefficient分类
交通运输引用本文复制引用
钟小春,余明学,竺维彬,米晋生,钟长平,黄威然..土压平衡盾构非满舱气压辅助施工螺旋输送机闭气能力分析[J].同济大学学报（自然科学版）,2025,53(4):557-564,8.基金项目
国家自然科学基金面上项目(52178387) （52178387）
