工程地质学报2024，Vol.32Issue(1)：8-18,11.DOI:10.13544/j.cnki.jeg.2021-0683
太原湿陷性黄土微观结构沿剖面变化特征研究
STUDY ON CHARACTERISTICS OF MICROSTRUCTURE VARIATIONS ALONG WITH THE DEPTH OF TAIYUAN COLLAPSIBLE LOESS
摘要
Abstract
In this study,a sample of loess saturated with water at different depths in Taiyuan,Shanxi,was ana-lyzed through a combination of mercury intrusion and scanning electron microscopy.The morphological characteris-tics of loess particles and pores were described,and the law of change with depth was revealed.The following con-clusions are drawn:(1)Loess particles are affected by weathering,tending to refine with depth.(2)The stability of pores at different depths is related to multiple factors such as particle morphology and inter-particle cementation state.(3)The pores at different depths are divided into four size types:large(＞20 μm),medium(5～20 μm),small(0.1～5 μm),and micro(＜0.1 μm).The large pores are unstable and decrease with the increase of depth,while the micro pores are hardly affected by the depth of the soil.(4)In the range of medium and small pores,there are metastable pores of different sizes that can withstand a certain load beyond which they will collapse.The pores from large to small are gradually destroyed and transformed into smaller pores as the depth and pressure increase.The lo-ess in this condition is still in a metastable structure and is collapsible.(5)When the depth increases until the weight of the soil exceeds the strength limit of the last metastable pores,the small pores are compressed and de-stroyed,and the loess structure tends to be stable.Below this depth,the loess almost loses its collapsibility.关键词
黄土/微观结构/深度/湿陷/压汞/扫描电镜Key words
Loess/Microstructure/Depth/Collapsibility/MIP/SEM分类
建筑与水利引用本文复制引用
陈轩翌,许领,魏欣,董立..太原湿陷性黄土微观结构沿剖面变化特征研究[J].工程地质学报,2024,32(1):8-18,11.基金项目
国家自然科学基金青年项目(资助号:42007278),国家重点研发计划子课题(资助号:2018YFC150470ZKT01),国家自然科学基金委重大基金项目子课题(资助号:41790440),中央高校基本科研业务费专项资金资助(资助号:xhj032021017-02).This research is supported by the National Natural Science Foundation of China(Grant No.42007278),the National Key Research and Development Program of China(Grant No.2018YFC150470ZKT01),Major Program of National Natural Science Foundation of China(Grant No.41790440)and the Fundamental Research Funds for the Central Universities(Grant No.xhj032021017-02). （资助号:42007278）
