铁伊高速铁路岛状多年冻土融沉特性及工程对策  

Thawing Settlement Characteristics and Engineering Countermeasures of Tieli-Yichun High Speed Railway Island Permafrost

作　　者：王斌 WANG Bin(Heilongjiang Railway Development Group Co.Ltd.,Harbin 150000,China)

机构地区：[1]黑龙江铁路发展集团有限公司,哈尔滨150000

出　　处：《铁道建筑》2022年第3期153-157,共5页Railway Engineering

基　　金：国家自然科学基金(U1834206);中国国家铁路集团有限公司科技研究开发计划(N2020G056)。

摘　　要：结合铁伊(铁力—伊春)高速铁路沿线岛状多年冻土的分布特征,通过室内试验研究了铁伊高速铁路沿线不同种类的岛状多年冻土在不同影响因素条件下的融沉特性,并根据不同种类的多年冻土融沉特性进行了工程措施分析。研究结果表明:岛状多年冻土的融沉系数随着含水率的增大而增大,随着干密度的增大而减小;岛状多年冻土的融化压缩系数在不同试验荷载作用下并非常数,而是随着荷载的增大而减小。对于融沉系数较大且埋深较浅的富冰或饱冰多年冻土采取挖除换填的工程措施;对于融沉系数较小的多冰或者少冰冻土,采用挖除换填+预融的工程措施;对于埋深较大的多年冻土采取桩基加固的工程措施。Combined with the distribution characteristics of island permafrost along Tieli-Yichun high speed railway,the thawing settlement characteristics of different kinds of island permafrost along Tieyi high speed railway under different influencing factors were studied through indoor tests. The engineering measures were analyzed according to the thawing settlement characteristics of different kinds of permafrost. The results show that the thawing settlement coefficient of island permafrost increases with the increase of water content and decreases with the increase of dry density. The thawing compression coefficient of island permafrost is not constant under different test loads,but decreases with the increase of load. For the ice-rich or ice-saturated permafrost with large thawing settlement coefficient and shallow buried depth,the engineering measures of excavation and replacement shall be adopted. For the frozen soil(more iced or less iced)with small thaw settlement coefficient,the engineering measures of excavation and replacement with pre-thawing shall be adopted. For the permafrost with large buried depth,the engineering measures of pile foundation reinforcement shall be adopted.

关 键 词：高速铁路路基 岛状多年冻土 融沉特性 干密度 含水率 

分 类 号：U213.14[交通运输工程—道路与铁道工程]