A FREEZE-THAW DAMAGE MODEL OF CEMENT-SOLIDIFIED SOIL IN SEASONAL FROZEN SOIL ZONES
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摘要: 为探究水泥固化土在冻融循环作用下的疲劳损伤发展规律,基于对比不同水泥掺量改良土的应力-应变关系曲线,定义了水泥土强度损伤破坏方式;结合冻融损伤试验结果,分析了冻融损伤内部缺陷产生和发展的过程;以弹性模量作为损伤变量,得到了以弹性模量表征的水泥固化土冻融损伤模型;通过对试验数据的拟合,得到了各试验参数。采用其他地区不同试验条件下的试验结果对所建立的模型进行验证,结果表明,损伤模型可以很好地反映水泥固化土在冻融循环作用下的疲劳损伤扩展规律。Abstract: To explore the laws of fatigue damage for cement-solidified soil under the action of freeze-thaw cycle, the failure modes of strength for cement-solidified soil were defined based on analysis of the stress-strain curves for cement-solidified soil with different mass fractions of cement mix. The development processes of internal defects in freeze-thaw damage were analyzed, combined with the results of freeze-thaw damage tests. Taking elastic moduli as damage indexes, a freeze-thaw damage model of the cement-solidified soil characterized by elastic moduli was proposed. According to the model, the test data were fitted and the values of test parameters were obtained, the proposed model was checked by test results from other regions and in different test conditions, the results showed that the model could reflected the laws of fatigue damage for cement-solidified soil under the action of freeze-thaw cycle.
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Key words:
- seasonal frozen soil /
- cement-solidified soil /
- freeze-thaw cycle /
- damage model
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