论文部分内容阅读
提出了黄土结构改良的概念,即将黄土的天然属性——湿陷性和震陷性看作不良属性,对这种不良属性的消除实质上是对黄土固有属性的优化。在此基础上,采用化学方法改良了黄土的结构,即利用酸能溶解碳酸钙的特性,迅速有效的破坏黄土内部的不良孔隙结构,并通过电镜扫描的观察,分析了在不同压力下,不同浓度的乙酸溶液对湿陷性黄土的结构改良情况。试验结果表明:低压下,由于乙酸的作用,黄土的结构得到了显著改善;高压下,由于压力已经破坏了黄土的孔隙结构,乙酸的作用效果并不明显。又通过饱和压缩试验和固结快剪试验验证了乙酸溶液对黄土结构的改良效果:在同等压力条件下,经过乙酸溶液处理过的黄土发生二次湿陷或多次湿陷的可能性和危害性都较小,并且具有较高的抗剪强度。最后,指出了这一研究成果在现实应用中的可能:在预浸水法中添加适量的乙酸可以显著改善处理效果;能够为被酸性废水污染的黄土上的岩土工程建设及相关研究提供有价值的参考。
The concept of loess structural improvement is put forward. That is to say, the natural properties of loess, such as collapsibility and collapsibility, are regarded as bad attributes. The elimination of such bad attributes is essentially the optimization of inherent properties of loess. On this basis, the chemical method was used to improve the structure of loess, that is, the use of acid can dissolve the characteristics of calcium carbonate, quickly and effectively destroy the bad pore structure of loess, and observed by electron microscopy, analyzed under different pressures, different Concentration of acetic acid solution on the collapsible loess structural improvement. The results show that under low pressure, the structure of loess has been remarkably improved due to the action of acetic acid. Under high pressure, the pore structure of loess has been destroyed by pressure, and the effect of acetic acid is not obvious. Through the saturated compression test and the consolidation quick shear test, the improvement effect of acetic acid solution on the loess structure was verified: Under the same pressure condition, the loess that has been treated with acetic acid solution has the possibility of secondary collapse or multiple collapse, Both sexes are small and have high shear strength. Finally, it is pointed out that the research results may be applied in practical application. Adding appropriate amount of acetic acid to the pre-soaking method can significantly improve the treatment effect; it can provide valuable value for geotechnical engineering and related research on loess contaminated by acid wastewater The reference.