Influence of freezing-thawing cycles on micro-structure and shear strength of loess
By taking the loess from Luochuan in Shaanxi Province to prepare specimens,a series of compression tests and tri-axial shear tests were conducted to explore the characteristics of micro-structure and shear strength of undisturbed loess with freezing-thawing cycles.The experimental results indicate that the initial cementation structure of loess is gradually broken to become more and more loose with increasing of freezing-thawing cycles,and the void ratio of loess continuously increases in the same press.The initial structure of loess is completely disrupted after 50 freezing-thawing cycles,and a great deal of deformation probably produce when the additional press is more than geostatic stress.Because of shortening the initial cementation structure of loess with repeated freezing-thawing cycles,cohesive force of loess constantly decreases,and internal friction angle increases by increasing touch points of inter-particles.Shear strength of the undisturbed loess under repeated freezing-thawing cycles will be close to that of remolded loess.
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