基于湿陷性和震陷性的黄土微结构

Microstructure of loess in collapsibility and seismic subsidence

试验通过对原状及湿陷和震陷土样的微结构SEM图像的观测和分析,定量研究力和水两个外因作用下黄土的孔隙大小、数量及其分布规律的变化,通过不同外因的作用效果分析黄土结构特性.结果表明黄土震陷后孔隙较湿陷后大,认为胶结作用极易因浸水而软化破坏,胶结作用愈强,黄土发生湿陷的可能性愈大;但是胶结作用可以抵御外力作用,使黄土不容易因震陷而破坏.

Observation and analysis of the SEM images of soil microstructure of samples were made after the collapsing or post-seismic subsidence,and a primary sampling were also done.The change of loess pore in size,number and distribution under force or water was quantitatively studied.The loess structural behavior was confirmed through the change of microstructure under different forces.It appeared that the pores of the sampled post-seismic subsidence were larger than pores of the sampling after collapsing.It was assumed that cementation was easily dissolved in water,and the stronger the cementation,the more possible it was for collapsing to occur.Cementation could prevent loess from being damaged by a force without water,such as an earthquake.