Experimental Study on Frost Resistance of Fluidized Solidifiable Soil Integrated by Collapsible Loess and Red Sandstone
Freeze-thaw cycles are one of the important factors causing mechanical damage of soil.To study the strength characteristics of fluidized solidifiable soil integrated by collapsible loess and red sandstone ex-perienced freeze-thaw cycles,mechanical and scanning electron microscope tests were conducted on the flu-idized solidifiable soil experienced different rounds of freeze-thaw cycles by indoor tests,and the variable regularities of physical and mechanical parameters and energy dissipation mechanisms of the fluidized solid-ifiable soil with different mix proportions experienced freeze-thaw cycles were analyzed.The results indica-ted that the red sandstone content,water content and cement content increased with the rounds of freeze-thaw cycles and had different effects on compressive strength.To mix red sandstone could effectively im-prove the compressive strength of fluidized solidifiable soil.The relation between compressive strength and the rounds of freeze-thaw cycles complied with a decreasing exponential function relation.The main me-chanical indexes,including elastic moduli,masses,cohesion,internal friction angles and strain energy densities,decreased with the increase in the red sandstone content and the rounds of freeze-thaw cycles.Combining with the results by SEM,the variable regularity of microstructure of fluidized solidifiable soil damage by freeze-thaw cycles was analyzed.That freeze-thaw cycles could change the microstructure con-structed by red sandstone particles was pointed out,and thus the mechanism of energy dissipation of fluid-ized solidifiable soil experienced freeze-thaw cycles was clarified.
NETL
NSTL
万方数据
