石灰改良膨胀土高铁路堤离心模型对比试验研究  

CONTRAST TEST RESEARCH ON CENTRIFUGAL MODEL OF LIME-IMPROVED EXPANSIVE SOIL IN HIGH-SPEED RAILWAY EMBANKMENT

作　　者：王艳涛[1] 程谦恭[1,2] 王小芳 蓝康文 张玉超[4] 向越 

机构地区：[1]西南交通大学,成都610031 [2]西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室,成都610031 [3]四川理工大学,四川自贡643000 [4]中国地质大学,北京100083

出　　处：《工业建筑》2017年第7期96-101,共6页Industrial Construction

基　　金：国家自然科学基金项目(41530639;41372292);四川省科技计划项目(2010JY0066)

摘　　要：为研究石灰对膨胀土高铁路堤的改良效果,以膨胀土和石灰改良膨胀土为原材料,设计两组路堤模型,对其开展3次干湿循环条件下坡体响应离心模型试验研究,重点分析二者作为高铁路堤填料的工程特性差异。结果表明:随深度增加,路堤受大气影响减弱,改良土路堤的大气影响深度为20 cm,较之未改良土路堤深度小,石灰改良膨胀土可以作为高铁路堤填料;膨胀土和未改良土路堤浅部饱和含水率均在40%左右,其深部含水率都小于40%,但未改良土路堤中含水率变化较改良土路堤更为敏感;干湿循环条件下,5%的石灰掺入量可以有效抑制膨胀土变形,较好地遏制其膨胀潜势、渗透性、导热性、透水性等特性参数。In order to study the improved effect strengthened by lime for high-speed railway expansive soil embankment,expansive soil and lime improved expansive soil were as raw materials,two groups of embankment model were designed to carry out slope sliding response on centrifugal model test under three times dry-wet cycle,the engineering characteristic causing of different filling were analyzed emphatically. With the increase of depth,the results showed that the embankment were less influenced by the atmosphere,the atmosphere influence depth for improved embankment was about 20 cm,lower than that of the expansive soil embankment,lime improved expansive soil could be used as high railway embankment filling; the saturated moisture contents in the shallow of the embankment of both the expansive soil and the improved were about 40%,the moisture contents in the deepth of the embankment were less than 40%,but the moisture content changed in expansive soil was much more sensitive than that in the improved; with 5% lime under dry-wet cycle conditions,the deformation of expansive soil could be effectively restrained,the characteristic parameters of expansive potential,permeability,thermal conductivity and hydraulic conductivity were greatly improved.

关 键 词：膨胀土 改良膨胀土 干湿循环 离心模型试验 

分 类 号：U213.11[交通运输工程—道路与铁道工程]