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王大雁, 马巍, 常小晓, 王爱国. 深部人工冻土抗变形特性研究[J]. 岩土工程学报, 2005, 27(4): 418-421.
引用本文: 王大雁, 马巍, 常小晓, 王爱国. 深部人工冻土抗变形特性研究[J]. 岩土工程学报, 2005, 27(4): 418-421.
WANG Dayan, MA Wei, CHANG Xiaoxiao, WANG Aiguo. Study on resistance to deformation of artificially frozen soil in deep alluvium[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(4): 418-421.
Citation: WANG Dayan, MA Wei, CHANG Xiaoxiao, WANG Aiguo. Study on resistance to deformation of artificially frozen soil in deep alluvium[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(4): 418-421.

深部人工冻土抗变形特性研究

Study on resistance to deformation of artificially frozen soil in deep alluvium

  • 摘要: 本文通过模拟深部人工冻结土体固结、冻结、受力的实际过程,研究了反映冻土变形特性的割线弹性模量在应变不超过0.5%时随应变变化的趋势,讨论了两种不同土质、加载卸载、冻结温度和初始围压对深部冻土割线弹性模量的影响以及对冻土屈服后割线弹性模量衰减速率的影响,得出以下结论:深部冻土应力-应变曲线的弹性变形范围约为0.05%左右,且不受土质类型、加载卸载、冻结温度和初始围压的影响;但深部冻土的抗变形能力、冻土屈服后其抵抗变形能力的衰减速率强烈的依赖于土质类型、加载卸载、冻结温度和初始围压的高低,研究表明屈服前提高冻土抗变形能力的诸因素在冻土发生屈服后,都将加快冻土抗变形能力衰减的速率。

     

    Abstract: The resistance to deformation of artificially frozen soils in deep alluvium is investigated by relation between the secant Young’s modulus and the axial strain for different type of soil, loading or unloading, frozen temperature and initial confining pressure. It is observed that the stress-strain behavior of frozen soils in deep alluvium is highly nonlinear and the secant Young’s modulus might decrease with increasing strain, the limit of the elastic stage appeared similar for all conditions and was approximately 0.05% axial strain. On the other hand, the secant Young’s modulus of studied frozen soils and its degradation was closely related to the type of soils, loading or unloading, frozen temperature and initial confining pressure. Results indicate that the factors which can increase the secant Young’s modulus before yield of frozen soils would accelerates the rate of degradation of the secant Young’s modulus after yield of frozen soils.

     

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