寒区隧道围岩变形机理分析初探  

A study of freezing deformation of tunnel surrounding rock in cold region

作　　者：张全胜[1] 高广运[1] 杨更社[2] 蒲毅彬[3] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]西安科技大学建筑与土木工程学院,西安710054 [3]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000

出　　处：《岩土力学》2007年第2期307-310,314,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.40372119)

摘　　要：隧道围岩冻胀变形机理是寒区隧道工程常见的问题之一。首先评述了国内外现有关于寒区隧道冻胀机理的几种解释,然后对采自西部某寒区岩样进行饱水冻结,通过CT扫描技术观察了岩体内部细观结构变化、水分迁移,发现了围岩冻结后发生收缩的现象,从细观角度研究了岩体的冻胀和收缩机理,完善和补充了围岩冻胀机理假说。As is known to all that the freezing-heaving mechanism of tunnel surrounding rock is a common problem of the tunnel in the cold region. Firstly, the several existent theories about freezing-heaving mechanism are introduced and evaluated. Secondly, the freezing experiment of rock sample is mode; after saturated, the rock samples from a cold region in West China. The CT scanning technology is applied to measure the meso-structure change of rock sample and the water transfer within the sample. The shrinkage phenomenon in volume has been found after the rock sample frozen. Finally, the freezing-heaving mechanism of tunnel surrounding rock is studied, which is believable to be helpful to the tunnel in the cold region.

关 键 词：寒区隧道 围岩 冻结 CT扫描 损伤力学 

分 类 号：U451[建筑科学—桥梁与隧道工程]