Large deformations in deep tunnels excavated in weak rocks:Study on Y-Basque high-speed railway tunnels in northern Spain  

作　　者：Cosimo Iasiello Juan Carlos Guerra Torralbo Cesar Torrero Fernandez 

机构地区：[1]IRP biuro projektow sp.z.o.o.,al.Jana Pawla Ⅱ 11,00-828 Warszawa,Poland [2]European University of Madrid,Calle Tajo,s/n 28670 Villaviciosa de Odon,Madrid,Spain [3]Ayesa Ingenierıa S.A.,Paseo Castellana 91,28046 Madrid,Spain

出　　处：《Underground Space》2021年第6期636-649,共14页地下空间（英文）

摘　　要：Designing the support system for a deep tunnel in weak rock is always challenging,because a misjudgment of real rock behavior can lead to failures.During the construction of the Legutiano tunnel,which belongs to the high-speed railway network named Y-Basque in Spain,the measured convergences exhibited large deformations,which were significantly higher than those in the detailed design.At first glance,these deformations were associated with squeezing,as the tunnel was excavated in flysch-shales and limonite with a maximum cover of approximately 360 m.The aim of this study is to perform a retrofit analysis to compare the most popular empirical and analytical approaches for evaluating the squeezing effect,using geotechnical data pertaining to other tunnels excavated in the same area and in the same geological formations.Finally,a non-linear finite element analysis,focusing on time-dependent rock behavior,is conducted to reproduce the convergences measured.

关 键 词：SHALES LIMONITE SQUEEZING PLAXIS Tunnel monitoring 

分 类 号：U45[建筑科学—桥梁与隧道工程]