阿拉尔市区道路盐-冻胀变形破坏机理与成因分析  

Analysis of Alar Urban Roads Salt-Frost Heave Deformation Destruction Process and Causes

作　　者：杨保存[1,2] 刘新荣[1] 汪为巍[2] 牛新平[2] 杨柳[2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]塔里木大学水利与建筑工程学院,新疆阿拉尔843300

出　　处：《塔里木大学学报》2009年第2期1-6,共6页Journal of Tarim University

基　　金：塔里木大学校长基金自然科学项目(编号:TDZKQN07003)

摘　　要：阿拉尔市地处季节性冻土灾害区和严重盐胀灾害区。城市道路在建成后就遭受了严重的盐-冻胀变形破坏。本文通过对严重变形破坏路段的路基进行变形分析试验,结果表明:阿拉尔市区道路的变形类型属于盐胀-冻胀变形。其道路破坏经历了两个过程:初期是路基结构层中含量超标的硫酸盐使水泥土稳定基层发生化学膨胀破坏,其它结构层产生轻微的盐胀变形,使路面出现较小的裂缝变形;第二个过程是在盐胀变形持续的情况下,因外部水分入渗路基,冬季低温造成的冻胀变形,是路面破坏的主要因素。市区道路严重的变形破坏是多次季节性盐-冻胀变形产生的残余变形量累积的结果。要解决阿拉尔市区道路盐-冻胀变形破坏问题,需要在控制路基盐分、含盐量的基础上,必须要考虑地表水及地下水对路基盐-冻胀的影响。Alar City is located in disaster zone seasonally frozen soil and salt serious inflation disaster area. Alar urban roads built after suffering a serious salt -- frost heave deformation. Through serious deformation of the section of road test for deformation analysis. The results showed that： Alar urban roads belong to the type of deformation of the salt expansion and frost heave deformation. The destruction of roads has gone through two processes： At first, cement--soil chemical stability layer expansion damage of the road is the sulfate concentration exceeded the allowed limits of reason, other structures layer have a slight of saline suffusion deformation, so that the road surface appear of small cracks deformation; The course of two, the continued deformation of saline expansion due to external water infiltration into roadbed, caused by frost heave deformation in winter low temperature, damage to roads is a major factor. A serious deformation of urban roads is cycle repeated residual deform- ation of seasonal salt--frost heave deformation accumulated. Control subgrade soil salt content and process of surface water and groundwater to the subgrade impact of salt-- frost heave is the solution to urban road salt-- frost heave deformation of key measures.

关 键 词：盐渍土路基 硫酸盐渍土 盐-冻胀变形 残余变形 

分 类 号：U418[交通运输工程—道路与铁道工程]