摘要
兵团阿拉尔市某市政道路两侧存在水盐侵蚀和膨胀变形现象。据调研观测,绿化带每次漫灌会有水盐渗透到水泥稳定土基层(简称水稳层)中,随着时间积累,水盐会在水稳层中积聚,同时该地区昼夜温差大,冬季气候寒冷。预测是当地气候环境作用导致水稳层的变形。为了证实预测,主要采用人工模拟三种工况的环境作用:第一工况模拟水盐干湿循环作用,第二工况模拟冻融循环作用,第三工况是先模拟水盐干湿循环再模拟冻融循环作用。将水稳层试块放入三种工况中,实验结果表明:水盐干湿循环作用对水稳层的影响主要是化学作用引起的侵蚀;冻融循环作用主要是通过温度变换使水稳层中的盐分结晶膨胀,是水稳层结构发生膨胀变形主要原因;先进行水盐干湿循环作用会加速冻融循环作用,会加剧水稳层的结构破坏,破坏效应是两种作用的叠加效果。
A municipal road on both sides has water erosion and salt expansion deformation phenomenon in the Alar City. According to observation, when each flooding green belts will have to water and salt water stable infiltration to the pavement, by the water and salt migration effect, leading to water and salt accumulation in the water layer. Prediction is the local climate environment inducement of a- queous brine is the main reason for the unstable layer deformation. To confirm forecast, mainly uses the artificial simulation of the working condition of three kinds of environmental effect ： the first condition of water and salt dry - wet circulation function, simulation working condition of the second simulation of freezing and thawing cycle, working condition of the third salt dry - wet cycle and simula- tion of freezing and thawing cycle simulation water first. The experimental results show that the water salt dry - wet circulation of water stable layer is mainly the influence of erosion caused by chemical action; Freeze - thaw cycle effect mainly by temperature change make water stable layer of salt crystallization, was the main reason for the water stable layer structure expansion deformation; Salt dry - wet cycle in water first role will accelerate the freeze - thaw cycle effect, exacerbating water stable layer of structure damage, damage effect of two kinds of superposition effect.
作者
王飞
王成
赵军军
魏云亮
杨保存
Wang Fei Wang Cheng Zhao Junjun Wei Yunliang Yang Baocun(College of Water Resources and Architectural Engineering, Tarim University, Alar, Xinjiang 84330)
出处
《塔里木大学学报》
2017年第3期110-117,共8页
Journal of Tarim University
基金
国家自然科学基金项目(NO.51168042)
塔里木大学校长基金重大培育项目(TDZKPY2014001)
关键词
水稳层
水盐
干湿循环
冻融循环
对比试验
water- stable layer
water and sail
dry -wet circulation
freeze- thaw cycle effect
eontrast test
