吸附结合水对高液限土强度和渗透特性的影响试验研究
Experimental Study on Influence of Adsorbed Bound Water on Strength and Permeability Characteristics of High Liquid Limit Soil
符策源 1周世杰2
作者信息
- 1. 海南省交通工程建设局,海南 海口 570100
- 2. 长沙理工大学 交通运输工程学院,湖南 长沙 410114
- 折叠
摘要
为揭示吸附结合水对高液限土强度和渗透特性的影响规律,通过不同浓度的氯化钠溶液控制湖南和海南高液限土试样的初始吸附结合水含量,采用热重分析法测定该含量,再分别开展直剪试验、无侧限抗压强度试验和渗透试验.试验结果表明:随着盐溶液物质的量浓度的增大,吸附结合水含量减小,强结合水含量基本不变;吸附结合水黏滞性大、活动性小,具有一定的类固相性质;随着吸附结合水含量的降低,试样的抗剪强度和抗压强度均减小;在渗流过程中,随着吸附结合水含量的降低,渗透系数先增大后减小,但最终渗透系数大于初始值.该研究成果可为高液限土用作路基填料提供参考.
Abstract
In order to reveal the influence of adsorbed bound water on the strength and permeability characteristics of high liquid limit soil,the initial adsorbed bound water content of the high liquid limit soil specimens from Hunan and Hainan was controlled by different concentrations of sodium chloride solution,and thermogravimetric analysis method was used to determine the content.The direct shear test,unconfined compressive strength test,and permeability test were carried out.The results show that the adsorbed bound water content decreases with the increase in salt solution concentration,while the strong bound water content is basically unchanged.The adsorbed bound water has a high viscosity,low activity,and certain solid-like properties.With the decrease in the adsorbed bound water content,the shear strength and compressive strength of the specimens decrease.In the process of permeation,the permeability coefficient first increases and then decreases with the decrease in adsorbed bound water content,but the final permeability coefficient is greater than the initial value.The research results can provide a reference for the use of high liquid limit soil as subgrade filler.
关键词
道路工程/高液限土/吸附结合水/强度/渗透特性Key words
road engineering/high liquid limit soil/adsorbed bound water/strength/permeability characteristics引用本文复制引用
基金项目
国家自然科学基金(52278432)
海南省地方标准制修订项目(2021-Z043)
出版年
2024
国家科技期刊平台
NSTL
万方数据