冻融循环作用下水泥改良黄土铁路路基填料力学特性研究  

Study on the Mechanical Properties of Cement Improved Loess Railway Subgrade Filler under the Action of Freeze-thaw Cycle

作　　者：王博琦 WANG Boqi(China Railway First Group Building&Installation Engineering Co.,Ltd.,Xi'an,Shaanxi Province,710000 China)

机构地区：[1]中铁一局集团建筑安装工程有限公司,陕西西安710000

出　　处：《科技资讯》2022年第24期77-80,共4页Science & Technology Information

摘　　要：采用对比试验方法,对原状黄土、重塑黄土以及不同水泥掺量下改良黄土的冻融循环力学特性进行了研究,结果表明:重塑黄土的抗压强度略低于原状黄土,掺入水泥后,黄土的强度大大提升,并随着水泥掺量的增加而逐渐增大,抗压强度随冻融循环次数的增加而呈幂函数降低;原状黄土的粘聚力最小、内摩擦角最大,随着水泥掺量的增加,黄土的粘聚力和内摩擦角均逐渐增大,抗剪参数随着冻融循环次数的增加呈先减小后逐渐稳定的变化特征;压缩系数随冻融循环次数的增加而增大,随水泥掺量的增加而减小;结构强度随着冻融循环次数的增加而逐渐降低,随着水泥掺量的增加而逐渐增大;综合各项性能,建议改良黄土的水泥最佳掺量为8%。The freezing-thaw cyclic mechanical properties of undisturbed loess,remolded loess and improved loess under different cement dosage are studied by comparative test method.The results show that the compressive strength of remolded loess is slightly lower than that of undisturbed loess.After adding cement,the strength of loess increases greatly,and gradually increases with the increase of cement content.The compressive strength decreases in a power function with the increase of freeze-thaw cycles;The cohesion of undisturbed loess is the smallest and the angle of internal friction is the largest.With the increase of cement content,the cohesion and angle of internal friction of loess increase gradually,and the shear parameters decrease first and then become stable with the increase of freeze-thaw cycles;The compression coefficient increases with the increase of freeze-thaw cycles and decreases with the increase of cement content;The structural strength decreases with the increase of freeze-thaw cycles,and increases with the increase of cement content;According to the comprehensive performance,the optimum cement content of improved loess is recommended to be 8%.

关 键 词：冻融循环 黄土 水泥 铁路路基 最佳掺量 

分 类 号：TU447[建筑科学—岩土工程]