长江科学院院报2018，Vol.35Issue(5)：93-96,102,5.DOI:10.11988/ckyyb.20161197
冻融循环条件下亚氯盐渍土盐冻胀试验研究
Salt Heaving Test of Sub-chlorine Saline Soil under Cyclic Freezing and Thawing
摘要
Abstract
The temperature variation and salt expansion characteristics of natural sub-chlorine saline soil in Lop Nur under cyclic freezing and thawing are investigated. Test results show that under the action of cyclic freezing and tha-wing,the temperature fluctuation in a same soil layer keeps consistent;temperature distributes in a parabolic shape as freezing and thawing cycle proceeds, with the first and the second layers near the cold end surface undergoing great temperature changes while the third layer to the fifth layer experiencing small temperature change. Sub-chlo-rine saline soil with low liquid limit silt has a good effect of salt expansion and accumulation;the salt expansion in-creases as temperature declines,and vice versa,with the maximum salt expansion reaching 7.61 mm. In the first four periods (cycles), the salt heaving effect is obvious, and the salt expansion amount is about 80% of the totalsalt expansion. Salt expansion in the first six freeze-thaw cycles increases gradually, but the trend slowly attenuates,and tends to be stable in the seventh freeze-thaw cycles.关键词
亚氯盐渍土/盐胀特性/冻融循环作用/土体内部温度/盐冻胀量Key words
sub-chlorine saline soil/salt expansion characteristics/freeze-thaw cycles/internal temperature of soil/salt frost heave分类
建筑与水利引用本文复制引用
刘凯,张远芳,张运海,潘蕾..冻融循环条件下亚氯盐渍土盐冻胀试验研究[J].长江科学院院报,2018,35(5):93-96,102,5.基金项目
国家自然科学基金项目(41262012) （41262012）
新疆水文学及水资源重点学科基金项目(xjswszyzdxk20101202) （xjswszyzdxk20101202）
