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Degradation model of the dynamic mechanical properties and damage failure law of sandstone under freeze-thaw action

机译：冻融作用下砂岩动力力学特性与破坏破坏规律的退化模型

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摘要

In the construction process of alpine regions, the construction zone is often subjected to blasting vibrations, heavy truck transportation vibrations, earthquakes and other dynamic loads. It is of great significance to analyse the dynamic mechanical properties of a rock mass under the coupling action of freeze-thaw cycles and dynamic loading. In this paper, the degradation laws of the static mechanical parameters and dynamic mechanical parameters and the failure modes of the sandstone are studied by static mechanical tests, electron microscopic tests and uniaxial impact compression tests on sandstone samples with different numbers of freeze-thaw cycles under impact loading. The test results show that the dynamic increase factor (DIF) is affected by the number of freeze-thaw cycles and the strain rate, and the strain rate is the dominant factor. For the dynamic increase factor of the elastic modulus DIFE, the effect of the strain rate on the DIFE is much smaller than that on the DIF, and the variation in the DIFE decreases with the increase in the number of freeze-thaw cycles. When the strain rate is constant, the dynamic compressive strength of the sandstone samples decreases exponentially with an increase in the number of freeze-thaw cycles. When the number of freeze-thaw cycles is constant, the dynamic compressive strength of the sandstone samples increases linearly with increasing strain rate. The dynamic compressive strength degradation model of sandstone considering the number of freeze-thaw cycles and strain rate is obtained by fitting the experimental data. In the early stage of the freeze-thaw cycle, the main dynamic failure mode of sandstone under the action of freeze-thaw cycles and a lower impact load is the axial splitting failure mode, while the dynamic failure mode of sandstone under freeze-thaw action and a higher impact load is the crushing failure mode. The research results can be used to predict the dynamic compressive strength of rock under different strain rates and varying numbers of freeze-thaw cycles and provide a theoretical basis for similar engineering construction.
机译：在高山地区的施工过程中，施工区经常遭受爆破振动，重型卡车运输振动，地震和其他动载荷的影响。分析冻融循环与动态荷载耦合作用下的岩体动力力学特性具有重要意义。本文通过静态力学试验，电子显微镜试验和单轴冲击压缩试验研究了不同冻融次数下砂岩样品的静态力学参数，动态力学参数以及破坏模式。冲击负荷。试验结果表明，动态增加因子（DIF）受冻融循环次数和应变率的影响，应变率是主要因素。对于弹性模量DIFE的动态增加因子，应变速率对DIFE的影响远小于对DIF的影响，并且DIFE的变化随着冻融循环次数的增加而减小。当应变速率恒定时，砂岩样品的动态抗压强度会随着冻融循环次数的增加而呈指数下降。当冻融循环次数恒定时，砂岩样品的动态抗压强度随应变率的增加而线性增加。通过拟合实验数据，获得了考虑冻融循环次数和应变率的砂岩动态抗压强度退化模型。在冻融循环的早期阶段，砂岩在冻融循环作用和较低冲击载荷作用下的主要动态破坏模式为轴向劈裂破坏模式，而在冻融作用下砂岩的动态破坏模式为轴向破坏模式。更高的冲击载荷是破碎失败模式。研究结果可用于预测不同应变率和不同冻融循环次数下岩石的动态抗压强度，为类似工程建设提供理论依据。

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  • 来源
    《Soil Dynamics and Earthquake Engineering》 |2020年第5期|106094.1-106094.10|共10页
  • 作者

    Luo Yi; Qu Dengxing; Wang Gang; Li Xinping; Zhang Guang;

  • 作者单位

    Wuhan Univ Technol Hubei Key Lab Roadway Bridge & Struct Engn Wuhan Peoples R China;

    Wuhan Univ Technol Sch Safety Sci & Emergency Management Wuhan Peoples R China|Wuhan Univ Technol Sch Civil Engn & Architecture Wuhan Peoples R China;

    Wuhan Univ Technol Sch Civil Engn & Architecture Wuhan Peoples R China|Wuhan Univ Technol Hubei Key Lab Roadway Bridge & Struct Engn Wuhan Peoples R China;

    Wuhan Univ Technol Sch Safety Sci & Emergency Management Wuhan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Freeze-thaw cycles; Impact load; Strain rate; Dynamic response;

    机译：冻融循环;冲击负荷应变率;动态反应;

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