盾构掘进辅助气压平衡的关键技术研究

Key Techniques for the Auxiliary Air Pressure Balance Mode for Shield Tunnelling

对于埋深大、裂隙水发育的岩石地层以及富水、气密性好的复合地层,按常规全土压掘进模式。盾构负荷大。刀具磨损快,经常发生喷涌,导致效率低下、同步注浆质量差。文章在总结分析广州地铁一号线、二号线、三号线、十三号线实践经验的基础上,提出并明确了盾构施工"气压平衡"模式的定义和优缺点,研究了"气压平衡"掘进的关键技术,分析了采用该模式的次生风险并给出了预防和应急对策,对类似地层盾构施工具有重要的指导作用和借鉴意义。

As for the rock ground with large overburden and developed rock fisser water as well as the mixd ground with rich water and airtightness, the blow-out event often occurs clue to a large shield load and quick wear- ing of cutting tools when conventional full earth pressure driving mode is adopted, which results in low efficiency and poor-quallty simutaneous grouting. The definition of the ＂air pressure balance＂ mode and its advantages and disadvantages are presented based on practical experience with the Guangzhou Metro lines 1, 2, 3 and 13. Addition- ally, key techniques for ＂air pressure balance＂ driving mode are studied, secondary risks concerning this driving mode are analyzed and measures for prevention and countermeasures for emergencies are given in this paper.