摘要
为探究青海湖水位持续上升这一状况下冻融循环对青藏铁路环湖段路基带来的影响,对路基内不同含盐量、不同压实度以及不同含水率等因素对路基内水分迁移及冻胀规律的影响展开研究。试验结果表明:对于不同含盐量的土样,随着循环次数的增加,土样含水率逐渐降低,冻胀率逐渐增大(含盐量0土样除外),而且含盐量越高土样含水率降低越多,冻胀率增加越大。对于不同压实度的土样,随着循环次数的增加,土样含水率逐渐降低,冻胀率逐渐增大,而且压实度越大的土样含水率降低越少,冻胀率增加越大。对于不同初始含水率的土样,随着循环次数的增加,土样含水率逐渐降低,冻胀率逐渐增大,而且初始含水率越高的土样含水率降低越少,冻胀率增加越大。研究结果可为青海湖水位不断上升造成的青藏铁路环湖段路基含水率及冻胀控制的研究提供参考。
In order to explore the influence of freeze-thaw cycle on the roadbed of Qinghai-Xizang Railway around Qing-hai Lake under the condition of continuous rise of Qinghai Lake water level,the influence of different salt content,dif-ferent compaction degree and different water content in the roadbed on the water migration and frost heave law in the roadbed was analyzed.The test results are as follows.For soil samples with different salt content,with the increase of cycle times,the water content of soil samples decreases gradually,and the frost heave rate increases gradually(except for soil samples with 0%salt content).The higher the salt content,the more the water content of soil samples decrea-ses,and the greater the frost heave rate increases.For soil samples with different degrees of compaction,with the in-crease of the number of cycles,the water content of the soil sample gradually decreases,and the frost heave rate gradu-ally increases.The greater the degree of compaction,the less the water content of the soil sample decreases,and the greater the frost heave rate increases.For soil samples with different initial water content,with the increase of cycle times,the water content of soil samples decreases gradually,and the frost heave rate increases gradually.The higher the initial water content,the less the water content of soil samples decreases,and the greater the frost heave rate in-creases.The research results can provide a theoretical basis for the study of roadbed moisture content and frost heave control in the lake section of Qinghai-Xizang Railway caused by the rising water level of Qinghai Lake.
作者
唐先习
杜腾飞
张寿红
董江龙
栾恩铭
TANG Xianxi;DU Tengfei;ZHANG Shouhong;DONG Jianglong;LUAN Enming(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;China Railway Qinghai-Xizang Group Co.,Ltd.,Xining,Qinghai 810000,China;Xining Engineering Section of China Railway Qinghai-Xizang Group Co.,Ltd.,Xining,Qinghai 810000,China)
出处
《水利与建筑工程学报》
2024年第4期92-98,共7页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金(11962016)
中国国家铁路集团有限公司科技研究开发计划项目(K2022G017)
中国铁路青藏集团有限公司科技研究开发计划项目(QZ2022-G07)。
关键词
青藏铁路
环青海湖路基
冻融循环
水分迁移
Qinghai-Xizang Railway
roadbed around Qinghai Lake
freeze-thaw cycle
moisture changes
作者简介
唐先习(1972-),男,副教授,主要从事路基冻害机理及控制措施方面的研究工作。E-mail:695913483@qq.com。
