西安建筑科技大学学报(自然科学版)

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.

引言
1 试验材料与试验方法
2 结果分析与讨论
3 结论

图1 取样现场
Fig.1 sampling site

表1 土样基本物理参数<br/>Tab.1 basic physical parameters of soil sample

表1 土样基本物理参数
Tab.1 basic physical parameters of soil sample

图2 混凝土试块
Fig.2 Concrete sample

图3 直剪设备示意图<br/>Fig.3 Shear test apparatus

图3 直剪设备示意图
Fig.3 Shear test apparatus

图4 蒸馏水工况下剪应力-水平位移曲线<br/>Fig.4 The relationship between shear stress and shear displacement under distilled water

图4 蒸馏水工况下剪应力-水平位移曲线
Fig.4 The relationship between shear stress and shear displacement under distilled water

图5 蒸馏水工况下切向模量与水平位移曲线<br/>Fig.5 The relationship between tangent modulus and shear displacement under distilled water

图5 蒸馏水工况下切向模量与水平位移曲线
Fig.5 The relationship between tangent modulus and shear displacement under distilled water

图6 HCL溶液污染下剪切应力与水平位移曲线<br/>Fig.6 The relationship between shear stress and shear displacement under acid solution

图6 HCL溶液污染下剪切应力与水平位移曲线
Fig.6 The relationship between shear stress and shear displacement under acid solution

图7 HCL溶液污染下表观黏聚力与内摩擦角演变<br/>Fig.7 The relationship between apparent cohesion and friction angle under acid solution

图7 HCL溶液污染下表观黏聚力与内摩擦角演变
Fig.7 The relationship between apparent cohesion and friction angle under acid solution

表2 不同污染状态下界面的表观黏聚力和内摩擦角<br/>Tab.2 The apparent cohesion and friction angle under different contaminate conditions

表2 不同污染状态下界面的表观黏聚力和内摩擦角
Tab.2 The apparent cohesion and friction angle under different contaminate conditions

图8 HCL溶液污染工况下切向模量与水平位移曲线<br/>Fig.8 The relationship between tangent modulus and shear displacement under acid solution

图8 HCL溶液污染工况下切向模量与水平位移曲线
Fig.8 The relationship between tangent modulus and shear displacement under acid solution

表3 不同污染状态切向有关拟合参数<br/>Tab.3 Tangent relative parameters for interface under different contaminate conditions

表3 不同污染状态切向有关拟合参数
Tab.3 Tangent relative parameters for interface under different contaminate conditions

图9 NaOH溶液污染下剪切应力与水平位移曲线<br/>Fig.9 The relationship between shear stress and shear displacement under alkali solution

图9 NaOH溶液污染下剪切应力与水平位移曲线
Fig.9 The relationship between shear stress and shear displacement under alkali solution

图10 NaOH溶液污染下表观黏聚力与内摩擦角演变<br/>Fig.10 The relationship between apparent cohesion and friction angle under alkali solution

图10 NaOH溶液污染下表观黏聚力与内摩擦角演变
Fig.10 The relationship between apparent cohesion and friction angle under alkali solution

图11 NaOH溶液污染工况下切向模量与水平位移曲线<br/>Fig.11 The relationship between tangent modulus and shear displacement under alkali solution

图11 NaOH溶液污染工况下切向模量与水平位移曲线
Fig.11 The relationship between tangent modulus and shear displacement under alkali solution

图12 酸碱溶液污染工况下强度对比示意图<br/>Fig.12 The comparing of shear strength under acid and alkali solution

图12 酸碱溶液污染工况下强度对比示意图
Fig.12 The comparing of shear strength under acid and alkali solution

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备注

引言

1 试验材料与试验方法

2 结果分析与讨论

3 结论

期刊信息