论文摘要
Moisture and salt content of soil are the two predominant factors influencing its shear strength. This study aims to investigate the effects of these two factors on shear strength behavior of loess in the Xining Basin of Northeast Qinghai-Tibet Plateau, where such geological hazards as soil erosion, landslides collapse and debris flows are widespread due to the highly erodible loess. Salinized loess soil collected from the test site was desalinized through salt-leaching in the laboratory. The desalinized and oven-dried loess samples were also artificially moisturized and salinized in order to examine how soil salinity affects its shear strength at different moisture levels. Soil samples prepared in different ways（moisturizing, salt-leaching, and salinized） were measured to determine soil cohesion and internal friction angle. The results show that salt-leaching up to 18 rounds almost completely removed the salt content and considerably changed the physical components of loess, but the soil type remained unchanged. As salt content increases from 0.00% to 12.00%, both the cohesion and internal friction angle exhibit an initial decrease and then increase with salt content. As moisture content is 12.00%, the salt content threshold value for both cohesion and internal friction angle is identified as 3.00%. As the moisture content rises to 16.0% and 20.00%, the salt content threshold value for cohesion is still 6.00%, but 3.00% for internal friction angle. At these thresholds soil shear strength is the lowest, below which it is inversely related to soil salinity. Beyond the thresholds, however, the relationship is positive. Dissimilar to salinity, soil moisture content exerts an adverse effect on shear strength of loess. The findings of this study can provide a valuable guidance on stabilizing the engineering properties of salinized loess to prevent slope failures during heavy rainfall events.
论文目录
文章来源
类型: 期刊论文
作者: FU Jiang-tao,HU Xia-song,LI Xi-lai,YU Dong-mei,LIU Ya-bin,YANG You-Qing,QI Zhao-xin,LI Shu-xia
来源: Journal of Mountain Science 2019年05期
年度: 2019
分类: 基础科学,工程科技Ⅱ辑
专业: 建筑科学与工程
单位: Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,University of Chinese Academy of Sciences,Department of Geological Engineering, Qinghai University,College of Agriculture and Animal Husbandry, Qinghai University
基金: financially supported by the National Natural Science Foundation of China (Grant Nos. 41572306,41162010),Natural Science Foundation of Qinghai Province (Grant No.2014ZJ-906),Hundred Talents Program in Chinese Academy of Sciences (Grant No. Y110091025),Scientific and Technologic Support Plan of Qinghai Province (2015-SF-117),Changjiang Scholar Program and Innovative Research Team Building,MOE Grant Number (IRT_17R62),the 111 Project (Grant No. D18013)
分类号: TU444
页码: 1184-1197
总页数: 14
文件大小: 978K
下载量: 42