Strength and Disintegration Characteristics of Improved Red Clay and Its Micro-mechanism
To explore the relationship between soil strength characteristics and disintegration characteristics,two methods were used to improve red clay:increasing soil compaction and increasing the content of high molecular weight biopolymer guar gum,which has good ecological benefits.By conducting direct shear tests,disintegration tests,and scanning electron microscopy experiments on red clay with different compaction degrees and guar gum contents,the effects of compaction degrees and guar gum contents on the disintegration characteristics and shear strength of red clay were studied and analyzed,and their microscopic mechanisms were revealed.The results show that increasing the compaction degree and adding guar gum can effectively improve the mechanical properties and anti-disintegration of red clay.With the increase of compaction degree,the cohesion of the sample increases linearly,and the internal friction angle increased slightly.The addition of guar gum could significantly improve the internal friction angle and cohesion of soil.The final disintegration rate of red clay improved by guar gum is significantly reduced,and the disintegration of the sample no longer occurred when the dosage was 0.25%.Both methods of increasing soil compaction and adding guar gum can improve soil cohesion,increase internal friction angle,and enhance the attraction between soil particles,thereby improving soil strength and resistance to disintegration.Compared with improving soil compaction,adding guar gum to red clay has a better effect on enhancing its water stability.
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