In order to explore the influence of freeze-thaw cycle on the roadbed of Qinghai-Tibet 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-Tibet Railway caused by the rising water level of Qinghai Lake.
关键词
青藏铁路/环青海湖路基/冻融循环/水分迁移
Key words
Qinghai-Tibet Railway/roadbed around Qinghai Lake/freeze-thaw cycle/moisture changes
维普
万方数据