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Effect of freezing and thawing on K-0 geostatic stress state for granular materials

机译：冻融对粒状材料K-0静应力状态的影响

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摘要

The coefficient of lateral stress at rest, K-0, is an important soil parameter that characterizes the geostatic stress state of soils. In this study, an experimental testing program was established to investigate the values of K-0 for granular materials that are subject to freezing and thawing. Various material conditions, including different fines contents, relative densities and freezing-thawing cycles, were considered in the testing program. The values of K-0 for thawed condition were higher than for unfrozen condition with net volume decrease. The effect of freezing and thawing became more pronounced as fines content increased while the effect of relative density was small. From the multi-cycled freezing-thawing tests, it was observed that the increase in K-0 was most significant during the first freezing-thawing cycle. For frozen condition, the values of K-0 were very low up to a certain limit stress level. Beyond the limit stress level, the values of K-0 became higher and close to those of unfrozen condition. The increases in K-0 with net volume decrease after freezing and thawing process was explained with internal changes in microstructure and stress state of soils.
机译：静止时的侧向应力系数K-0是表征土壤静应力状态的重要土壤参数。在这项研究中，建立了一个实验测试程序来研究粒状材料的K-0值，这些材料会发生冻融。测试程序考虑了各种物料条件，包括不同的细粉含量，相对密度和冻融循环。解冻条件下的K-0值高于未冻结条件下的K-0值，净体积减少。随着细粉含量的增加，冷冻和解冻的效果变得更加明显，而相对密度的影响却很小。从多循环冻融试验中，观察到在第一个冻融循环中，K-0的增加最为显着。对于冻结条件，K-0的值非常低，直到达到一定的极限应力水平。超过极限应力水平，K-0的值变得更高并接近于未冻结条件。冻结和解冻过程后，K-0随净体积的减少而增加，这是通过土壤内部微观结构和应力状态的内部变化来解释的。

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