摘要
土体的物理力学性质与其微观结构特征密切相关,研究土体微观结构具有重要的科学意义。本文针对上海中心城区深部黏性土层(第⑧层)原状土样,采用GDS应力路径三轴试验、电镜扫描(SEM)试验和压汞试验,并结合Matlab图像处理技术,重点分析了土试样应力路径三轴试验前后微观孔隙结构的变化特征。通过对上海深部原状黏性土微观孔隙结构的研究,以期为建立土体微观结构与宏观工程特性的联系,指导本地深层地下空间开发利用提供技术参考。
The physico-mechanical properties of soils are closely related to the microstructural characteristics. The study of soil microstructure is of immense scientific significance. In this study, the GDS stress path triaxial test, scanning electron microscope (SEM) test, and mercury injection test were performed on, and MATLAB image processing technology was applied to, a deep, undisturbed sample of cohesive soil (8th layer) in central Shanghai. The characteristics of micro-pore structure before and after the stress path triaxial test were analyzed emphatically. The micro-pore structure study of original undisturbed cohesive soil in Shanghai is expected to provide an experimental foundation and reference for the establishment of the relationship between micro-structure and macroscopic engineering soil characteristics and to serve as a framework for the exploration and utilization of local deep underground space.
作者
张士宽
刘婷
陈大平
兰立信
ZHANG Shikuan;LIU Ting;CHEN Daping;LAN Lixin(Shanghai Institute of Geological Survey, Shanghai 200072, China;Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
出处
《上海国土资源》
2019年第3期52-58,共7页
Shanghai Land & Resources
基金
上海市规划和自然资源局重大基础调查项目“上海后工业化时期地质资源环境调查评价与应用”(SHXM-00-20180425-5255)
关键词
原状黏性土
微观结构
应力路径三轴试验
电镜扫描
压汞试验
深部土体
工程地质特性
地下空间开发
undisturbed cohesive soil
micro-structure
stress path triaxial test
electron microscopy
mercury intrusion test
deep soil mass
engineering geological characteristics
underground space development
