Deformation Mechanism and Design Countermeasures of Tunnel Portal in Volcanic Deposit Clay Stratum  

作　　者：XIA Jian Engineer Senior ZHENG Mingda(Translated) 

机构地区：[1]Overseas Business Department,China Railway Design Corporation,Tianjin

出　　处：《Chinese Railways》2024年第1期38-45,共8页中国铁路（英文版）

摘　　要：Shortly after tunneling,problems such as primary-support through cracks and clearance infringement are found in the shallow-buried section of tunnel No.4 of the Jakarta-Bandung High Speed Railway(Jakarta-Bandung HSR),and orthogonal cracks can be found on the earth surface in front of the working face,which brings great challenges to the tunnel construction.In view of the above engineering problems,the sliding surface is speculated according to the geological and field conditions,and the impact of landslides is applied in the model in the form of external load.The paper uses the numerical simulation method to analyze and compare the impact of landslides on the tunnel structure and deformation,and puts forward the reinforcement measures.The conclusions of the studies are:(1)under the influence of heavy rainfall,the strength index of volcanic deposit clay stratum drops sharply,and meanwhile the multiple factors including tunnel excavation are liable to cause sliding of the front slope;(2)parallel landslide in front of the tunnel has a great impact on the tunnel,so setting-up of pre-reinforcement measures to control landslide shall be the focus of similar projects during design;(3)the deformation and stress of the tunnel structure can be significantly controlled for safe construction by strengthening the shallow-buried tunnel with pile foundation and longitudinal and transverse beam frames during landslide.

关 键 词：Jakarta-Bandung HSR tunnel clay stratum numerical simulation deformation mechanism anti-slide pile 

分 类 号：U45[建筑科学—桥梁与隧道工程]