水-盐-温耦合环境路基盐-冻融循环试验研究  

Test Study on Salt-Freeze-Thaw Cycles of Subgrade in Water-Salt-Temperature Coupling Environment

作　　者：周子怡 杨保存[1,2] 张勤玲 杨晓松[1,2] Zhou Ziyi;Yang Baocun;Zhang Qinling;Yang Xiaosong(College of Water Resources and Architecture Engineering,Tarim University,Aral,Xinjiang,843300,P.R.China;Research center of Southern Xinjiang Geotechnical Engineering,Aral,Xinjiang 843300,P.R.China)

机构地区：[1]塔里木大学水利与建筑工程学院,新疆阿拉尔843300 [2]南疆岩土工程研究中心,新疆阿拉尔843300

出　　处：《地下空间与工程学报》2024年第6期1894-1903,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52068062);江西省教育厅科学技术研究项目(GJJ190621);新疆生产建设兵团一师横向项目(SWJ2022KT23);塔里木大学校长基金(TDZKSS202151)。

摘　　要：新疆南疆区域沥青混凝土道路路基结构受南疆特殊的盐渍土的水-盐-温耦合环境作用,在干湿循环作用和盐-冻融循环作用下路基结构发生损伤破坏。运用研发的水-盐-温多场耦合试验系统模拟南疆盐渍土环境特有的干湿循环和盐-冻融循环耦合环境作用,对沥青混凝土道路路基结构试样开展盐-冻融循环环境作用下的损伤破坏试验研究。结果表明:在一个盐-冻融循环周期水盐分布沿路基结构高度具有显著的变化特性,路基基底土中的水盐在温度梯度作用下由下向上发生迁移积聚,盐-冻融循环作用使路基结构中的水盐相态变化产生的应力应变是路基结构发生损伤变形的主要原因;可通过控制优化道路路基结构水-盐-温环境因子,阻断水盐在路基结构中的迁移,有效控制盐-冻融循环作用对路基结构的影响。The subgrade structure of asphalt concrete roads in southern Xinjiang is affected by the coupling environment of water,salt,and temperature in the special saline soil environment in southern Xinjiang,the subgrade structure is damaged under the action of dry-wet cycles and salt-freeze-thaw cycles.The developed water-salttemperature multi-field coupling test system is used to simulate the unique coupling environmental effects of drywet cycles and salt-freeze-thaw cycles in saline soil environment in southern Xinjiang,the damage and failure test of asphalt concrete road subgrade structure samples under the action of salt-freeze-thaw cycles environment is carried out.The results show that the distribution of water and salt in a salt-freeze-thaw cycle has obvious variation characteristics along the height of the subgrade structure,the water and salt in subgrade soil migrate and accumulate from bottom to top under the action of temperature gradient,the stress and strain caused by the change of water and salt phase in subgrade structure under the action of salt-freeze-thaw cycles are the main reasons for the damage and deformation of subgrade structure.By controlling and optimizing the water-salt-temperature environmental factors of road subgrade structure,the migration of water and salt in subgrade structure can be blocked,and the influence of salt-freeze-thaw cycles on subgrade structure can be effectively controlled.

关 键 词：路基 盐-冻融循环 盐-冻胀 强度衰减 

分 类 号：U416[交通运输工程—道路与铁道工程]