工程地质学报2016，Vol.24Issue(1)：102-108,7.DOI:10.13544/j.cnki.jeg.2016.01.013
西峰塬黄土的湿陷性研究
UNIAXIAL COMPRESSION AND SEM TESTS FOR LOESS COLLAPSIBILITY AT LOESS PLATEAU OF XIFENG
摘要
Abstract
The behavior of undisturbed loess in the case of moistening or demoistening is investigated using double-line uniaxial compression test in this paper.The collapsible deformation rules of collapsible loess are examined and analyzed,during the growth process of humidity and pressure.And the microstructure of the samples are tested using SEMtechnique.Furthermore the microstructure of samples is analyzed with quantitative method and fractal theory.The results are shown the followings:(1 )"Rigid node failure " of trellis pores can cause the loess collapsibility.(2)Water content of loess has a marked effect on its collapsible deformation.When pressure is some value,its exceeding collapsible probability can increase as moisture content increases.Similarly,the test data show that for loess with constant water content,its exceeding collapsible probability can increase gradually as pressure increases.(3)The average number of pore of sample obviously increases and the pore area decreases after the sample is collapsed.The collapse is a process that small pore increases,fractal dimension decreases,and complexity of the pore increases.The concept of the exceeding collapsible coefficient is put forward.An analysis is made on some issues about study of hydrocompaction from the view point of unsaturated soil mechanics.Finally a case study is given.It reflects the properties of collapsible deformation under different factors.关键词
湿陷变形/SEM技术/超越湿陷率/微结构/架空孔隙Key words
Collapsible deformation/SEM technique/Exceeding collapsible coefficient/The microstructure/Trellis pore分类
天文与地球科学引用本文复制引用
吴光辉,王家鼎,马威,王延寿..西峰塬黄土的湿陷性研究[J].工程地质学报,2016,24(1):102-108,7.基金项目
国家自然科学基金(40972193,41372269),高等学校博士学科点专项科研基金(20116101130001)资助. （40972193,41372269）
