干湿循环过程中红黏土改良土路基填料试验研究  

Experimental Study on Red Clay Improved Soil as Subgrade Filler in the Process of Dry⁃Wet Cycles

作　　者：曾帅 曾长贤[3] 卞友艳[3] 华丽晶[3] 张栋 ZENG Shuai;ZENG Changxian;BIAN Youyan;HUA Lijing;ZHANG Dong(State Key Laboratory of Track Technology of High-speed Railway,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]高速铁路轨道技术国家重点实验室,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2020年第6期82-84,共3页Railway Engineering

基　　金：中国铁道科学研究院基金(ATJ17YF02);中铁第四勘察设计院集团有限公司基金(2018K094-1)。

摘　　要：对广西红黏土改良路基填料进行干湿循环试验,比较水泥掺量、含水率、是否添加改良剂等因素对改良土耐久性的影响。红黏土水稳性差,干湿循环后出现一定程度的质量损失,而新型改良剂对提高红黏土干湿循环下的耐久性作用显著。试验结果表明:水泥掺量11%~15%、压实系数0.9、含水率高于最优含水率6%~7%时,无侧限抗压强度和质量损失率满足要求。Dry-wet cycle tests were carried out on Guangxi red clay improved subgrade fillers to compare the effects of cement content,water content,and whether to add modifiers and other factors on the durability of improved soil.The water stability of red clay is poor,and there is a certain degree of quality loss after the dry-wet cycle,while the new modifier has a significant effect on improving the durability of red clay under the dry-wet cycle.The test results show that the unconfined compressive strength and mass loss rate meet the requirements when the cement content is 11%~15%,the compaction coefficient is 0.9,and the water content is 6%~7%higher than the optimal water content.

关 键 词：铁路路基 填料改良 试验研究 红黏土 改良剂 

分 类 号：U213.14[交通运输工程—道路与铁道工程]