杭州地铁1号线过江隧道特殊地质施工方法

摘要

介绍杭州地铁1号线穿越钱塘江隧道采用的土压平衡盾构法.由于地质情况复杂,盾构施工要同时克服卵石层、高承压水、有害气体(主要为甲烷)三大难题.论述在这些特殊地质条件下采取的掘进施工工艺,有效地克服了以上难题,保证工程安全顺利进行.%Qiantang river-crossing tunnel on Hangzhou subway Line 1 adopted earth pressure balanced shield technology. Due to the complicated geological conditions, tunneling construction must overcome the problems of existing cobble layer, high confined water and harmful gases on the excavation route. Excavation techniques adopted under the special geological conditions overcame the above-mentioned problems effectively, and guaranteed the safe and smooth construction of the tunneL