摘要
选用无机粉态和液态固化剂配以硅酸盐水泥对浅表层淤泥土进行固化,通过宏观静力学试验和动三轴试验以及微观扫描电镜分析,进行铁路浅表层淤泥地基固化研究。结果表明:液态固化剂在固化施工和提高淤泥土性能上优于粉态固化剂,固化剂掺量相同时,液态固化剂固化淤泥土强度高于固态固化剂,掺量在3%~4%时高出30%以上;固化淤泥土在14d后强度趋于稳定;淤泥土在循环动载作用下的动应变随水泥和固化剂含量的增加而大大减小,水泥或固化剂掺量增加2%,在50N动荷载下减小约2倍,在100N动荷载下减小3~5倍;淤泥土的动弹模随水泥掺量和固化剂掺量的增加略微增大;淤泥加固后原状土的粒状架空结构中颗粒间缝隙被填充,结构更加密实,因此宏观动强度增大。
Inorganic powder and liquid curing agent were used with Portland cement to solidify the shallow mucky soil.Through macroscopic static tests,dynamic triaxial tests and scanning electron microscope observation,the solidification of railway shallow mucky soil foundation was studied.Results show that the liquid curing agent is better than the powder curing agent in improving the strength of mucky soil and is easier to operate.With the same content of curing agent,the strength of the soil sample solidified by liquid curing agent is higher than that of the soil sample solidified by power curing agent,and the strength is more than 30%higher when the content is 3%~4%.The strength of solidified soil tends to be stable after14 days.The dynamic strain of mucky soil under cyclic dynamic load decreases greatly with the increase of cement and curing agent.When the content of cement or curing agent increases by 2%,the dynamic strain decreases by about 2 times under 50 Ndynamic load and decreases by 3~5 times under 100 Ndynamic load.The dynamic elasticity modulus of mucky soil increases slightly with the increase of cement and curing agent.After solidification,the gap between particles in the granular aerial structure of undisturbed soil is filled,then the soil structure is more compact,thus the macroscopic dynamic strength increases.
作者
李浩
程马遥
LI Hao;CHENG Mayao(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Construction Department,China Railway Guangzhou Group Co.,Ltd.,Guangzhou Guangdong 510088,China;School of Transportation,Civil Engineering and Architectural Engineering,Foshan University,Foshan Guangdong 528000,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第2期11-17,共7页
China Railway Science
基金
佛山市自筹经费类科技计划项目(1920001001673)。
关键词
铁路
地基
浅表层淤泥
固化
动应变
动弹模
微观机理
Railway
Foundation
Shallow mucky soil
Solidification
Dynamic strain
Dynamic elasticity modulus
Microscopic mechanism
