高速铁路寒冷地区路基改良填料冻融性能研究  

Study on the Freeze-thaw Resistance of Improved Subgrade Filler in Cold Regions for High-speed Railway

作　　者：张俊武 柯堰齐 路延伸 赵嘉 ZHANG Junwu;KE Yanqi;LU Yanshen;ZHAO Jia(No.1 Engineering Co.,Ltd.of CCCC First Highway Engineering Group Co.,Ltd.,Beijing 102205,China;Hebei University of Civil Engineering and Architecture,Zhangjiakou 075000,Hebei,China)

机构地区：[1]中交一公局第一工程有限公司,北京102205 [2]河北建筑工程学院,河北张家口075000

出　　处：《路基工程》2023年第3期49-55,共7页Subgrade Engineering

摘　　要：针对高速铁路寒冷地区路基改良填料,进行冻融循环后无侧限抗压强度试验,探究改良剂种类、掺量和养护龄期变化对改良填料抗冻融耐久性能的影响。结果表明:改良填料的强度随着养护龄期的延长和水泥掺量的增加而提升;粉煤灰的掺入会降低填料的强度;改良填料的冻融强度损失值呈现出指数型降低。采用冻融强度损失可以较好地评估填料在不同养护龄期下的强度变化。填料的冻结温度为-0.3℃,改良填料的冻融变形与水泥掺量呈正相关,与粉煤灰掺量呈负相关。In relation to the improved subgrade filler in cold regions for high-way railway,an unconfined compressive strength test after freeze-thaw cycles is carried out.It explores the influence of the type,content and curing age of the modifier on the freeze-thaw resistance durability of the improved filler.The results show that the strength of the improved filler increases with the extension of curing age and the increase of cement content;the addition of fly ash reduces the strength of filler;the loss of freeze-thaw strength of the improved filler decreases exponentially.The Loss of Freezw-thaw Strength can be used to better evaluate the change in strength of the filler at different curing ages.The freezing temperature of the filler is-0.3℃;the freezing-thawing deformation of the improved filler is positively correlated with the content of cement while negatively correlated with the content of fly ash.

关 键 词：改良填料 养护龄期 冻融循环 无侧限抗压强度 冻融变形 

分 类 号：U214.11[交通运输工程—道路与铁道工程]