水平旋喷超前预加固新技术在处理隧道坍塌方中的应用

Application of Horizontal Jet Grouting Advanced Pre-reinforcement New Technology in Dealing with Tunnel Collapse

在隧道发生坍塌方后围岩变得极不稳定,特别是在富水未成岩粉细砂地层中,易形成流塑状,导致二次坍塌,造成初期支护背后脱空,收敛变形,严重威胁到施工的安全和质量.详细介绍了兰渝铁路桃树坪隧道出口引进意大利水平旋喷超前预加固新技术对富水未成岩粉细砂层发生多次塌方后的处理技术.

The tunnel surrounding rock became very volatile after the collapse especially in rich water immature fine sandstone strata,the fine sand strata is easy to formation flow of plastic and leading to collapse for the second time,which causes back of the primary support collapse,conver-gence deformation,seriously threat the safety and quality of construction.This article implies the horizon-tal j et grouting advanced pre-reinforcement new technology introduced form Italy used to the rich water immature fine sandstone which used in the exit of Taoshuping tunnel in Lanyu railway.