全新统坡残积层工程特性及隧道变形机理研究  

Study on Engineering Characteristics and Tunnel Deformation Mechanism of Holocene Slope Eluvium

作　　者：宋振军[1] SONG Zhenjun(China Railway 12th Bureau Group Co.Ltd.,Taiyuan Shanxi 030024,China)

机构地区：[1]中铁十二局集团有限公司,山西太原030024

出　　处：《铁道建筑技术》2022年第10期50-54,共5页Railway Construction Technology

基　　金：中铁十二局集团有限公司科技研究开发计划项目(集团2022研-18号)。

摘　　要：新建重庆至昆明高速铁路穿越西南地区第四系全新统坡残积地层,地层成岩程度低、稳定性差、强度低、雨季含水率高,给隧道建设带来极大挑战。本文通过文献调研、室内试验和现场测试归纳坡残积地层工程特性,利用FLAC软件对隧道变形机理展开研究,并提出相应对策。研究表明:随着含水率增加,土体黏聚力、内摩擦角及压缩模量呈非线性减小,通过回归分析得到各指标与含水率之间的函数关系式;在本次模拟支护条件下,含水率40%为坡残积地层围岩失稳的临界含水率。研究成果应用于渝昆高铁李家村隧道并取得较好效果。The newly-built Chongqing-Kunming High-Speed Railway crosses the Quaternary Holocene slope eluvial strata in southwest China.The strata have low diagenesis,poor stability,low strength and high moisture content in rainy season,which brings great challenges to the tunnel construction.In this paper,the engineering characteristics of slope eluvial strata are summarized by means of literature investigation,indoor test and field test,and the deformation mechanism of tunnel is studied by using FLACsoftware,and the corresponding countermeasures are put forward.The research shows that with the increase of water content,the cohesion,internal friction angle and compression modulus of the soil mass decrease nonlinearly.Through regression analysis,the functional relationship between each index and water content is obtained.Under the support conditions of this simulation,the water content of 40%is the critical water content for the instability of slope eluvial strata.The research results have been applied in the Licun tunnel project of Chongqing-Kunming High-Speed Railway and achieved certain results.

关 键 词：渝昆高铁 隧道工程 坡残积地层 数值模拟 变形机理 

分 类 号：U455.49[建筑科学—桥梁与隧道工程] U451.2[交通运输工程—道路与铁道工程]