季节冻土区路基冻胀翻浆防治措施试验研究  

Experimental study on the treatments against frost heaving and boiling of subgrade in seasonal frozen area

作　　者：常法[1] 李东庆[1] 张坤[1] 房建宏 徐安花 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃兰州730000 [2]青海省公路科研勘测设计院,青海西宁810008

出　　处：《甘肃农业大学学报》2011年第3期147-155,共9页Journal of Gansu Agricultural University

基　　金：冻土工程国家重点实验室基金(SKLFSE-ZY-03);国家高技术研究发展计划项目(2008AA11Z103);中国科学院西部行动计划(二期)项目(KZCX2-XB2-10)

摘　　要：根据位于青海省109国道橡皮山试验段所观测的温度及水分数据,系统分析了传统砂砾垫层路基与隔水土工膜加碎石垫层路基在外界气候环境作用下,路基内各个观测位置温度与水分的变化以及造成这些变化的原因.比较了两个断面下路基各个观测位置的水分变化率的差异以及造成这些差异的原因,分析了这些差异对路基冻胀翻浆的影响.研究结果表明,在橡皮山地区,不仅仅存在地表水自上而下的迁移,而且在冬季土体负温度梯度和毛细作用还会促使水分自下而上的迁移,因此,相对于传统砂砾垫层路基,隔水土工膜加碎石垫层路基对于预防季节性冻土区路基冻胀翻浆效果更好.According to the moisture and temperature data obtained from the Xiangpishan test section of 109 National Road in Qinghai Province,the changes and induced causes of temperatures and moistures at different positions of the embankment under the action of the external climate conditions were systematically analyzed.In addition,the change rates and induced causes of temperatures and moistures between the traditional gravel embankment and crushed rocks mat embankment were discussed.Further more,the effects of these differences on the frost heaving and boiling of embankment were analyzed.The results showed：it not only existed the top-down migration of ground surface water,but also existed bottom-up soil water migration under negative temperature gradient and capillary actions.Thus,it was concluded that the crushed rocks mat embankment with waterproof geo-textile was much superior to the traditional gravel embankment for preventing the frost heaving and boiling of embankment in the seasonally frozen soil area.

关 键 词：季节性冻土区 冻胀 翻浆 隔水土工膜 砂砾垫层路基 碎石垫层路基 

分 类 号：P642.14[天文地球—工程地质学]