摘要
以青藏铁路西格段季节性冻土区路基冻害为研究背景,在室内分普通和盐化两个试验段填筑路基实体模型,进行封闭系统中反复冻融循环条件下的模型试验,分析冻融循环条件下普通路基和人工盐化路基的温度和位移规律,并探讨水分、盐分的迁移规律。结果表明:路基土体温度与环境温度变化趋势一致,路基土体的温度滞后于环境温度约36 h;越靠近冷端的位置,温度波动范围越大,温度随着深度的增加逐渐减小,温差也随之减小,路基土体温度的波动范围约为环境温度波动的一半;温度是影响水分迁移的主要因素,水分迁移在路基顶面以下一定的范围内达到最大,越靠近冷端,水分迁移量越大;路基土盐化之后冻胀量减小约73.9%,说明人工盐化路基土的方法可以整治季节性冻土区路基冻害。
Based on the research background of roadbed freezing injury in the seasonally frozen soil area of Qinghai-Tibet railway,roadbed solid mode is filled indoors,and the model test is carried on under the condition of repeated freezing and thawing cycles in a closed system. The temperature,frost heave and thawing rule of ordinary sugared and artificial stalinized roadbed under freeze-thaw cycle were analyzed,and the law of water and salt migration was discussed. The results show that the internal temperature of sugared soil is consistent with the environmental temperature,and the temperature in the subsoil is lag about 36 hours of the environmental temperature. The closer to the cold end,the greater the temperature fluctuation range is,temperature decreases with the increase of depth,and the temperature difference decreases. The fluctuation range of the internal temperature of the subsoil is about half of the fluctuation of ambient temperature.Temperature is the main factor affecting the water migration and the water transfer reaches the largest in the range of the sugared,the closer to the cold end,the greater the moisture transfer. After the stalinization of sugared soil,the frost heaving decreased by about 73. 9%,indicating that the method of artificial saline subsoil can be used to improve the seasonal frozen soil sugared freezing damage.
作者
巩丽丽
王彦虎
杨楠
张延杰
刘德仁
GONG Lili;WANG Yanhu;YANG Nan;ZHANG Yanjie;LIU Deren(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu730070,China;Xining Railway Section of Qinghai Tibet Railway Company,Xining,Qinghai810006,China)
出处
《中国地质灾害与防治学报》
CSCD
2019年第3期129-135,共7页
The Chinese Journal of Geological Hazard and Control
基金
青藏铁路公司科技研究开发计划课题(QZ2015-G01)
冻土工程国家重点实验室开放基金(SKLFSE201607)
关键词
季节性冻土区
人工盐化路基
冻胀
模型试验
冻融循环
seasonal frozen soil area
artificial saline sugared
frost heave
model test
freeze-thaw cycle
