[1]刘华,胡鹏飞,王梦南,等.冻融循环对酸污染黄土抗拉特性劣化试验研究[J].西安建筑科技大学学报(自然科学版),2021,53(04):493-501.[doi:10.15986/j.1006-7930.2021.04.005]
　LIU Hua,HU Pengfei,WANG Mengnan,et al.Experimental study on degradation of tensile properties of acid-contaminated loess by freeze-thaw cycles[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2021,53(04):493-501.[doi:10.15986/j.1006-7930.2021.04.005]
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冻融循环对酸污染黄土抗拉特性劣化试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
53
期数:
2021年04期
页码:
493-501
栏目:
出版日期:
2021-08-28

文章信息/Info

Title:
Experimental study on degradation of tensile properties of acid-contaminated loess by freeze-thaw cycles
文章编号:
1006-7930(2021)04-0493-09
作者:
刘华1; 2; 胡鹏飞1; 王梦南1; 刘乃飞1; 2; 胡文乐1
(1.西安建筑科技大学 土木工程学院,陕西 西安 710055; 2.陕西省岩土与地下空间工程重点实验室,陕西 西安 710055)
Author(s):
LIU Hua1; 2; HU Pengfei1; WANG Mengnan1; LIU Naifei1; 2; HU Wenle1
(1.School of Civil Engineering,Xi’an Univ. of Arch. & Tech.,Xi’an 710055,China; 2.Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an 710055,China)
关键词:
原状黄土;  冻融循环;  酸污染;  抗拉强度;  劣化机制
Keywords:
undisturbed loess;  freeze-thaw cycle;  acid pollution;  tensile strength;  deterioration mechanism
分类号:
TU444
DOI:
10.15986/j.1006-7930.2021.04.005
文献标志码:
A
摘要:
考虑到黄土地区经受着季节性冻融循环作用的影响,并随着工业化进程的不断推进,黄土被大量生活污水及工业废水侵入,进而导致土体的内部组构及基本物理力学指标发生改变,诱发土体抗拉特征产生劣化趋势,影响着天然边坡及场地的稳定状态.基于此,本文以铜川地区Q3黄土为研究对象,通过调研取样并人工配置盐酸、硫酸和硝酸的4种不同摩尔浓度的污染液,进行室内冻融循环条件下的酸污染黄土抗拉强度试验研究,探讨了酸污染原状黄土在冻融循环下的抗拉强度演变规律,进一步分析了抗拉特征的耦合劣化结果.结果表明:酸污染原状黄土抗拉强度随着冻融循环次数的增加均呈减小态势,3～5次冻融循环之后黄土抗拉强度趋于基本稳定; 且相同浓度下不同酸污染土的抗拉强度随着冻融循环次数的增加呈现出不同的特征.基于试验数据建立酸侵蚀与冻融循环耦合抗拉强度劣化模型,可为孔隙水污染下的冻融黄土地区的边坡稳定性提供数据支撑及为地质灾害防治设计提供参考.
Abstract:
Considering that the loess area is subject to seasonal freeze-thaw cycles,and with the continuous advancement of industrialization,the loess is invaded by a large amount of domestic sewage and industrial wastewater,which leads to changes in the internal structure and basic physical and mechanical indicators of the soil and the deterioration of the tensile characteristics of the soil,and affects the stability of the natural slope and the site,this study takes Q3 loess in Tongchuan area as the research object,and conducts indoor acid-contaminated loess tensile strength test under the condition of indoor freeze-thaw cycles through investigation,ampling and manual configuration of 4 different molar concentrations of hydrochloric acid,sulfuric acid and nitric acid. Based on the test,the evolution of tensile strength of acid-contaminated undisturbed loess under freeze-thaw cycles is discussed,and the coupling degradation results of tensile characteristics are further analyzed. The results show that the tensile strength of the undisturbed acid-contaminated loess decreases with the increase in the number of freeze-thaw cycles,and the tensile strength of the loess tends to be basically stable after 3 to 5 freeze-thaw cycles. The results also show that the tensile strength of different acid-contaminated soil shows different characteristics with the increase of freeze-thaw cycles under the same concentration. The establishment of a tensile strength degradation model coupled with acid erosion and freeze-thaw cycles based on experimental data can provide data support for slope stability in freeze-thaw loess areas contaminated by pore water and provide reference for geological disaster prevention and control.

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(编辑 桂智刚)

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备注/Memo

备注/Memo:
收稿日期:2020-01-14 修改稿日期:2021-07-05
基金项目:国家自然科学基金项目(51608436); 陕西省自然科学基础研究计划(2019JQ756); 陕西省教育厅专项科研项目(19JK0452); 中国博士后科学基金项目(2019M663648)
第一作者:刘华(1983-),男,博士,副教授,主要从事环境岩土工程方面研究.E-mail:liuhua029@xauat.edu.cn
更新日期/Last Update: 2021-08-28