摘要
采用基本土工物理力学试验、粒度分析试验、XRD衍射试验和SEM扫描试验等多种手段对不同路段的不同层位的路基黄土进行分析研究.结果表明,由于路基严重沉降段土的黏土矿物含量较低,黏粒较少,土颗粒之间胶结作用差,并且参与“集粒”作用的黏土矿物所占比例较少,从而导致“集粒”作用较差,致使土体颗粒无法形成稳定的结构,所以在渗水饱和及循环振动荷载条件下,可能使土体产生高压缩性,对路基土体的抗破坏性产生了不良影响,从而对路基的不均匀沉降产生促进作用.为该铁路线病害机制和土体改性材料研制提供了重要依据.
In this study,various methods such as basic geophysical property test,particle size analysis test,XRD diffraction test,and SEM scanning test are used to analyze and study the subgrade loess at different layers in different road sections.The results of the study show that due to the low content of clay minerals,fewer clay particles,poor cementation between soil particles,and less proportion of clay minerals involved in“aggregation”because of the serious subsidence of the subgrade,“aggregation”is weak and soil particles connot form stable structures.Therefore,under the condition of water seepage saturation and cyclic vibration load,the soil may have high compressibility,which harms the damage resistance of the subgrade soil.Thus,the uneven settlement of roadbeds is aggravated.This research provides an important basis for the disease mechanism of the railway line and the development of soil modification materials.
作者
邓瑞
赵蒙
张旭
谭博仁
徐世桐
DENG Rui;ZHAO Meng;ZHANG Xu;TAN Boren;XU Shitong(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106 China;State Key Laboratory of Geo-Hazard Prevention and Geo-Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都大学学报（自然科学版）》
2024年第1期100-106,共7页
Journal of Chengdu University（Natural Science Edition）
基金
成都大学大学生创新训练计划孵化培育项目(202211079013)。
关键词
铁路既有线
不均匀沉降
黄土
物质成分
微观结构
existing railway line
differential settlement
loess
material composition
microstructure
