天然盐渍土冷端阶梯式持续降温盐-冻胀及水盐迁移试验研究  

Natural Saline Soil Salt-frost Heave Cold End Step Continuous Cooling and Experimental Study on Water and Salt Migration

作　　者：张运海[1] 张远芳[1] 刘凯[1] 潘蕾[1] ZHANG Yun-hai ZHANG Yuan-fang LIU Kai PAN Lei(College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, P. R. Chin)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052

出　　处：《科学技术与工程》2016年第31期265-269,共5页Science Technology and Engineering

基　　金：国家自然科学基金(41262012);新疆水文学及水资源重点学科基金(xjswszyzdxk20101202)资助

摘　　要：为研究罗布泊地区天然盐渍土中盐-冻胀规律和盐胀机制,选取罗布泊含砂低液限粉土在自动化大尺寸可控温度循环仪中冷端阶梯式持续降温,进行盐-冻胀试验。结果表明,该土为含砂低液限粉土,在土体温度为5-0℃时,发生明显土体膨胀,此温度区间为该土类盐胀起胀温度区;冷端持续降温过程土体膨胀变形可分为3个阶段,第一阶段为盐胀起胀阶段,第二阶段为盐胀增长阶段,第三阶段为盐-冻胀共同增长阶段;水分与盐分从暖端向冷端迁移,其中氯离子与水分迁移具有一定共性,而硫酸根离子与二者不同。For the study of Lop Nur Region natural saline soil salt-regularity of frost heave and salt expansion mechanism, the Lop Nur bearing sand silt of low liquid limit silt was selected in the automation of large size control- lable temperature cycler of ladder type at the cold end of salt and frost heaving test continued to cool. The results show that： the soil is low liquid limit silt with sand, when the soil temperature is 5 ℃ -0 ℃, the obvious soil ex- pansion occurs, this temperature range is the soil salt expansion temperature zone. The cold end of the continuous cooling process of expansive deformation can be divided into three stages： the first stage for salt heaving up and ex- pansion stage, the second stage is the salt expansion growth stage, the third stage is salty and frost common growth phase. Moisture and salt from the warm end to the cold end of the migration, chloride ions and water transfer has a certain commonality, and sulfate ions and two different.

关 键 词：天然盐渍土 冷端持续降温 盐-冻胀 起胀温度 水盐迁移 

分 类 号：TU448[建筑科学—岩土工程]