西安建筑科技大学学报(自然科学版)

以铜川重塑黄土为研究对象进行崩解室内试验,对硝酸污染后的击实黄土崩解特性进行分析研究.在制备不同干密度、含水率和硝酸浓度等击实试样后,探讨不同工况下的黄土崩解演变规律及其结果和影响.结果表明:干密度一定时,崩解速率随含水率呈现先增加后减小的趋势,当试样含水率在16%时崩解速率可达到最大值,当含水率在20%时崩解性基本消失; 当含水率一定时,崩解速率随干密度的增加而减小; 硝酸污染试样的干密度与含水率对崩解速率的影响与未污染试样崩解速率规律基本一致,且随着酸浓度的增加崩解速率增加.同时,基于试验结果分别建立了干密度、含水率和硝酸浓度与崩解速率的函数关系,并进一步探讨各因素间的相关性.研究结果可为黄土地区环境岩土工程问题及工程地质防灾减灾设计和抢险救灾提供数据支撑和理论依据.

A laboratory test on the remolded loess from Tongchuan adopts self-assembled loess disintegration tester to study the disintegration characteristics of nitro-polluted loess, and makes samples from the loess with different dry density, moisture content and nitric acid concentration for laboratory tests to explore the disintegration evolution law of loess under different conditions. The corresponding disintegration curve was drawn according to the data of laboratory disintegration test. The results showed that when the dry density was fixed, the disintegration velocity first increased and then decreased along with the moisture content. When the moisture content of sample was 16%, the disintegration velocity reached its maximum value, and when the moisture content reached 20%, the disintegration ability basically disappeared. When the moisture content is constant, the disintegration velocity decreases with the increase of dry density. The effects of dry density and moisture content on disintegration velocity are consistent with that of uncontaminated samples. The disintegration velocity increases as the acid concentration increases. At the same time, the functional relationship between dry density, water content and disintegration velocity and concentration of nitric acid and disintegration velocity were established respectively, and the correlation among various factors was further discussed, which provided the basis for the design of geotechnical problems and geological disaster prevention in acid-polluted loess area.

引言
1 试验材料与方法
2 试验结果与分析
3 结论

表1 土样的基本物理性质指标<br/>Tab.1 Physical properties of soil samples

表1 土样的基本物理性质指标
Tab.1 Physical properties of soil samples

图1 颗粒分析曲线<br/>Fig.1 Curve of particle size analysis

图1 颗粒分析曲线
Fig.1 Curve of particle size analysis

图2 崩解试验装置<br/>Fig.2 Apparatus of disintegration test

图2 崩解试验装置
Fig.2 Apparatus of disintegration test

表2 试验变量因素<br/>Tab.2 Experimental variable factors

表2 试验变量因素
Tab.2 Experimental variable factors

图3 典型黄土崩解曲线<br/>Fig.3 Typical loess disintegration process curve

图3 典型黄土崩解曲线
Fig.3 Typical loess disintegration process curve

图4 土体浸水示意图<br/>Fig.4 Diagram of soil submerging

图4 土体浸水示意图
Fig.4 Diagram of soil submerging

表3 未污染土的平均崩解速率<br/>Tab.3 Average disintegration velocity of uncontaminated soil

表3 未污染土的平均崩解速率
Tab.3 Average disintegration velocity of uncontaminated soil

图5 未污染试样含水率-平均崩解率曲线<br/>Fig.5 Moisture content-average disintegration velocity curve of uncontaminated samples

图5 未污染试样含水率-平均崩解率曲线
Fig.5 Moisture content-average disintegration velocity curve of uncontaminated samples

图6 未污染试样干密度-平均崩解率曲线<br/>Fig.6 Dry density-average disintegration velocity curve of uncontaminated samples

图6 未污染试样干密度-平均崩解率曲线
Fig.6 Dry density-average disintegration velocity curve of uncontaminated samples

表4 不同含水率时a、b数值<br/>Tab.4 Values of parameters a and b at different moisture content

表4 不同含水率时a、b数值
Tab.4 Values of parameters a and b at different moisture content

图7 参数a、b拟合曲线<br/>Fig.7 Fitting curves of parameters a and b

图7 参数a、b拟合曲线
Fig.7 Fitting curves of parameters a and b

表5 a值拟合参数<br/>Tab.5 Fitting parameters of a value

表5 a值拟合参数
Tab.5 Fitting parameters of a value

表6 b值拟合参数<br/>Tab.6 Fitting parameters of b value

表6 b值拟合参数
Tab.6 Fitting parameters of b value

图8 污染试样含水率-平均崩解率曲线<br/>Fig.8 Moisture content-average disintegration velocity curve of contaminated samples

图8 污染试样含水率-平均崩解率曲线
Fig.8 Moisture content-average disintegration velocity curve of contaminated samples

图9 污染试样干密度-平均崩解率曲线<br/>Fig.9 Dry density-average disintegration velocity curve of contaminated samples

图9 污染试样干密度-平均崩解率曲线
Fig.9 Dry density-average disintegration velocity curve of contaminated samples

图10 污染试样硝酸浓度-平均崩解率曲线<br/>Fig.10 Concentration of nitric acid-average disintegration velocity curve of contaminated samples

图10 污染试样硝酸浓度-平均崩解率曲线
Fig.10 Concentration of nitric acid-average disintegration velocity curve of contaminated samples

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备注

引言

1 试验材料与方法

2 试验结果与分析

3 结论

期刊信息