Study On The Relationship Between Chemical Constituents And Engineering Properties Of Red Soil During Alkali

Laterite is one of the main materials in geotechnical engineering. Debris flow and landslide are common geological disasters in the clay areas. Therefore, the study of the engineering properties has been a concern of the industry. Laterite is mainly composed of iron oxide, alumina, titanium oxide and silicon dioxide. These oxides have a direct and important influence on the safety of the engineering. Funded by the National Natural Science Foundation of China, this article focuses on analyzing and discussing the relationship between main chemical composition and properties of Laterite in the process of alkali erosion. And it achieved good results.The Grey correlation model analysis method is introduced into this research area. A grey correlation model for many kinds of oxides in Laterite and engineering Index is proposed. And the improvement of the model is realized by using the software. So it significantly improves the efficiency and accuracy of calculation. The related concepts, such as conversion rate, loss degree and the contribution rate are introduced into the research process. The mechanism of alkaline material erosion on the Laterite was revealed, the quantitative evaluation index of 4 main chemical compositions and engineering properties is proposed. The influence of the change of the components of the Laterite on the engineering index was determined quantitatively. The content change of silica and alumina has a key role in the engineering properties of alkali corrosion. But the difference of the contribution rate of different engineering index is different. Analyze the results of the accelerated life test, the microscopic observation, the filtering out ion detection and the field drilling test. The long-term degradation mechanism of Laterite in alkaline environment is clarified. The results of the experiments and the prototype verification are consistent with the conclusion of chemical analysis. In the process of alkali erosion, put forward the trend prediction model of the change of main oxide content in Laterite and engineering index change. Verify the feasibility of the method.The results can be referenced by similar research projects. It can be widely used for safety assessment, life prediction, and reinforcement of Laterite engineering. Use influence factors to predict the change of Engineering Index. It can be regarded as a new way of thinking. And can be further developed into an effective method for the identification of the quality of Laterite; According to the change of the composition of the clay, the quantitative data can be targeted to develop the engineering maintenance plan. So it avoids the waste caused by blind reinforcement or long-term damage.