滑带土与原状土的显微结构对比分析

Comparative analysis of microstructure of slip zone soil and undisturbed soil

滑带土的显微结构分析对揭示滑面演化具有重要意义。文中对原状土与滑带土中的黄土及红黏土进行了SEM和CT试验,探讨了原状土与滑带土的微观结构特征,对比分析了原状土与滑带土之间的差异。结果表明:滑带黄土颗粒的平均体积小于原状黄土,而滑带黄土的孔隙比大于原状黄土,并且占主导比例的粒径和孔隙直径的范围比原状黄土更广;滑带黄土相较于原状黄土,其颗粒和孔隙均表现出占主导比例的中间颗粒和孔隙减少,占非主导地位的颗粒和孔隙比例增大;在滑带土交界面附近黄土一侧孔隙发育更高,而红黏土一侧裂隙发育程度更高。

The microstructure analysis of slip zone soil is of great significance to reveal the evolution of slip surface.In this paper,SEM and CT tests of loess and red clay in undisturbed soil and sliding zone soil were carried out,the microstructure characteristics of undisturbed soil and sliding zone soil were discussed,and the difference between undisturbed soil and sliding zone soil was compared and analyzed.The results show that the average volume of sliding zone loess particles is smaller than that of undisturbed loess,while the porosity ratio of sliding zone loess is larger than that of undisturbed loess,and the dominant ratio of particle size and pore diameter is wider than undisturbed loess.In sliding zone loess,the dominant intermediate grains and pores decrease,and the proportion of non-dominant grains and pores increase compared with undisturbed loess.Near the interface of slip zone soil,the pores on the loess side developed higher,while on side of the red clay,the lateral fissures are more developed.