酸碱溶液污染对黄土-混凝土界面剪切特性影响试验研究  

Experimental study on influence of shear characterizes at loess-concrete interface under contaminate by acid and alkali solution

作　　者：刘华[1,2] 王梦南 冯旭晨 王松鹤 丁九龙[3] LIU Hua;WANG Mengnan;FENG Xuchen;WANG Songhe;DING Jiulong(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi′an 710055,China;School of Civil Engineering,Xi′an University of Technology,Xi′an 710048 China)

机构地区：[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 [3]西安理工大学土木工程学院,陕西西安710048

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第1期111-117,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51608436);陕西省自然科学基础研究计划(2022JM246)。

摘　　要：为研究黄土工程中孔隙水被酸碱溶液污染对土-混凝土界面剪切行为的影响,对不同水化学溶液、浓度和法向应力下重塑黄土-混凝土界面进行系列剪切试验,探讨经历孔隙水酸碱污染下的土-混凝土界面剪切强度、摩擦特征指标等参数的变化规律.试验结果表明:孔隙水化学污染对界面剪切应力-水平位移曲线形态影响较小,均为应变硬化型,曲线形态符合双曲线模型,剪切模量随着水平位移的增大而呈指数型衰减的趋势;法向应力、溶液浓度和种类均对初始剪切模量有影响,随着浓度的增大,HCL溶液下的初始剪切模量减小,而NaOH溶液相反;HCL污染溶液随着浓度的增大,表观黏聚力增大,内摩擦角减小,NaOH溶液则相反,但总体剪切强度均呈现出碱液增强,酸液减弱的趋势.In order to find out the effect of pore-water contaminated by acid and alkali solution on the shear behavior of soil-concrete interface in loess engineering,a series of shear tests were carried out under different hydrochemical solutions,concentrations and normal stresses,and the variation trend of shear strength,friction characteristic index and other parameters of soil-concrete interface under contaminate pore water were discussed.The results can be seen as:pore-water contaminated has little effect on the shape of interface shear stress-horizontal displacement curve,which is strain hardening type.The curve shape conforms to hyperbolic model,and the shear modulus decreases exponentially with the increase of horizontal displacement.hydrochemical solutions,concentrations and normal stresses all have effects on the initial shear modulus.With the increase of concentration,the initial shear modulus in HCl solution decreases,while in NaOH solution have the opposite trend.With the increase of HCl concentration,the apparent cohesion of HCl contaminated solution increases and the internal friction angle decreases,while that of NaOH solution is the opposite trend,but the shear strength shows the trend of alkali solution increasing and acid solution decreasing.

关 键 词：孔隙水污染 重塑黄土 界面接触 直剪试验 

分 类 号：TU4[建筑科学—土工工程]