煤田地质与勘探2016，Vol.44Issue(4)：105-109,5.DOI:10.3969/j.issn.1001-1986.2016.04.020
冻结温度对原状黄土物理力学性质的影响
Influence of freezing temperature on the physical and mechanical properties of undisturbed loess
摘要
Abstract
Soil samples were taken from the typical sites in loess area of Shaanxi Province. Freezing test was con-ducted with the soil samples of different moisture content and dry density to explore the frost heave law of loess under freezing temperature. The results show that Shaanxi loess samples in dry state did not have or little frost heave. The frost heave of loess increased with the moisture content, With the decrease of the freezing temperature, the frost heave decreased gradually and eventually became constant. When the moisture content is low, freezing temperature effect on the dry density of loess sample was not obvious. With the increase of moisture content, the smaller the porosity, the more significant effect on the loess samples under the high moisture content. When the moisture content is low, frozen loess showed shrinkage, under moderate moisture content,the frost heave increased slightly, and under high moisture content the frost heave increased obviously. In the process of freezing ,the frost heave force made the intergranular contacting points increase and the proportion of large pores in loess decrease, resulting in increases of the internal friction angle in loess, the lower the freezing temperature, the greater the moisture content, the greater the internal friction angle. The growth of ice crystals destroyed the connection and weakened loess structure, decreased cohesion force. The greater the moister content, the smaller the porosity, the greater impact on the loess cohesion.关键词
冻结温度/冻胀规律/黄土/含水率/强度Key words
freezing temperature/frost heaving law/loess/moisture content/strength分类
建筑与水利引用本文复制引用
董琪,陈强,叶万军..冻结温度对原状黄土物理力学性质的影响[J].煤田地质与勘探,2016,44(4):105-109,5.基金项目
国家自然科学基金项目(41172262)；教育部新世纪人才支持计划项目(NCET-12-1044)；陕西省科技统筹创新工程计划项目(2015KTZDSF03-02，2015KTZDSF03-03-01)@@@@National Natural Science Foundation of China(41172262)；Program for New Century Excellent Talents in University of Ministry of Education of China(NCET-12-1044)；Shaanxi Science &Technology Co-ordination & Innovation Project (2015KTZDSF03-02，2015KTZD SF03-03-01) （41172262）
