Stabilizing subgrades of transport structures by injecting solidifying solutions in cold regions  

作　　者：P.O.Lomov A.L.Lanis D.A.Razuvaev M.G.Kavardakov 

机构地区：[1]Siberian Transport University,DusiKoval'chuk St.,191,Novosibirsk,630049,Russia

出　　处：《Research in Cold and Arid Regions》2021年第5期357-365,共9页寒旱区科学（英文版）

摘　　要：Transport structures built throughout the period from 1960 to 1980 in permafrost regions based on the principle of permafrost preservation are subject to deformations.In many cases,the reason is a gradual change in temperature and their subgrade condition within the active zone due to the structures'technogenic impact.Design solutions for the fifty-year-old structures fail to ensure in all cases their reliable operation at the present time.The greatest danger to the reliable operation of railway lines in cold regions is uneven deformations of bridges,which are barrier places.Therefore,the solution to this problem is urgent especially due to the necessity of increase carrying capacity.The purpose of this study is to increase reliability of bridge operation in cold regions through strengthening the subgrade by reinforcement with injection of solidifying solutions.The problem of uneven deformations due to permafrost degradation is considered using the example of a railway bridge located in the northern line of the Krasnoyarsk railway.Deformations of the bridge abutments began immediately after the construction was completed and the bridge was open for traffic-since 1977.Permafrost degradation was developing more actively straight under the abutments due to higher thermal conductivity of the piles concrete.Notably,thawing intensity of frozen soils under the bridge abutments is uneven due to its orientation to the cardinal points.The analysis of archive materials and results of the geodetic survey made it possible to systematize the features of augmenting deformations of each abutment over time.The engineering-geological survey with drilling wells near the abutments ensured determination of soil characteristics,both in the frozen and thawed states.Thermometric wells were arranged to measure temperatures.The analysis and systematization of the data obtained allowed us to develop geotechnical models for each abutment of the bridge.The peculiarity of these models is allowance for changes in the strength and deformation c

关 键 词：reinforcement of soils injection of solidifying solution strengthening of pier footing soils geotechnical model bridge abutments deformations plastic frozen soil permafrost degradation 

分 类 号：U416.1[交通运输工程—道路与铁道工程]