高寒地铁洞桩法跨既有隧道施工沉降变形分析

Analysis on Settlement of Subway Construction Crossing Existed Tunnel in Alpine Regions

高寒地区暗挖施工受季节性冻土影响,施工风险大,既有人防隧道的存在更增加了安全风险。通过研究洞桩法上、下导洞施工顺序对既有结构内力的影响,总结分析上、下导洞施工顺序对既有人防隧道内力的影响规律,减小洞桩法施工过程中既有隧道结构沉降变形,确保洞桩法各道工序的顺利实施。

The excavation construction exists more danger in alpine region because of the influence of seasonal frozen soil. Existing air defense tunnel increases security risk. Through the study on the influence of cavern pile method about upper and lower pilot sequence of construction on both the structure internal force,this paper analyzed the influence about the law of upper and lower pilot construction sequence of the existing civil air defense tunnel of different internal forces. The settlement and deformation of existing tunnel structure in the hole pile method construction process should be reduced to ensure the smooth implementation of the hole pile method of each procedure.