酸溶液对原状黄土抗拉强度的影响试验研究  

Experimental study on the influence of acid solutions to the tensile strength characteristics of undisturbed loess

作　　者：刘华[1,2] 胡鹏飞 王松鹤[3] 刘乃飞 胡文乐 谷宏全 LIU Hua;HU Pengfei;WANG Songhe;LIU Naifei;HU Wenle;GU Hongquan(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,P.R.China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,P.R.China;School of Civil Engineering,Xi'an University of Technology,Xi'an 710048,P.R.China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安710055 [3]西安理工大学土木工程学院,西安710048

出　　处：《土木与环境工程学报（中英文）》2022年第5期109-117,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51608436、51778528);西安理工大学省部共建西北旱区生态水利国家重点实验室自主项目(No.2019KJCXTD-12)。

摘　　要：黄土受到污染后,土体的组分以及内部结构会发生改变,从而使得土体抗拉强度也随之发生改变。通过人工配置盐酸、硫酸和硝酸的4种不同浓度的污染液,对比蒸馏水和污染后的土样进行直接拉伸破坏试验,探讨酸污染黄土的拉应力拉应变特征及过程,进一步分析不同酸溶液种类、浓度对土体抗拉强度演化规律的影响。结果表明:随着酸污染液的侵入,黄土的抗拉强度均小于未污染状态;且随着污染液浓度的增大,盐酸和硝酸污染黄土的抗拉强度均呈减小态势,而硫酸污染英黄土的抗拉强度却逐步恢复,拟合后的污染液浓度与抗拉强度呈现出较好的幂函数关系。基于黄土的抗拉强度和抗剪强度,探讨酸污染黄土的联合抗剪强度拟合关系。After loess is contaminated,the composition and internal structure of the soil will change,so that the tensile strength of the soil will also change.Based on this,in this paper,four kinds of polluted liquids with different molar concentrations of hydrochloric acid,sulfuric acid and nitric acid were manually configured,and the direct tensile failure test was carried out by comparing distilled water and contaminated soil samples,and discussed the tensile stress-tensile strain characteristics and process of acid contaminated loess.The effects of different acid solution types and concentrations on the evolution of soil tensile strength were further analyzed.The results show that the tensile strength of loess is lower than that of the unpolluted state with the invasion of the acid polluted liquid.With the increase of the concentration of the contaminated solution,the tensile strength of the loess polluted by hydrochloric acid and nitric acid were decreased,while that of sulfuric acid gradually recovered.The fitted concentration of the contaminated solution showed a good power function relationship with the tensile strength.Finally,based on the tensile strength and shear strength of the polluted loess,the fitting relationship of the combined shear strength of contaminated loess was discussed.

关 键 词：原状黄土 酸污染 抗拉强度 演化特征 卧式拉伸仪 

分 类 号：TU431[建筑科学—岩土工程]