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首页> 外文期刊>Environmental earth sciences >An experimental study on characteristics of impact compression of freeze-thawed granite samples under four different states considering moisture content and temperature difference
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An experimental study on characteristics of impact compression of freeze-thawed granite samples under four different states considering moisture content and temperature difference

机译：考虑水分含量和温差冻结冻结花岗岩样品冲击压缩特性的实验研究

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摘要

The mechanics of rock masses in cold regions have attracted the attention of researchers from all over the world, and the concern here is that the mechanical properties of rock masses are inevitably weakened under freeze-thaw cycles. In this paper, first, granite samples were subjected to different freeze-thaw cycles, and then treated in four different states, such as saturated and frozen states, saturated and normal temperature states, dry and frozen states, as well as dry and normal temperature states. The impact compression test was carried out using the Split Hopkinson Pressure Bar (SHPB) device. Results show that the impact strength of granite samples deteriorates with the increase of freeze-thaw cycles in the same state; for samples in different states, although the number of freeze-thaw cycles is equal, the degree of deterioration of the impact strength is different. For freeze-thawed granite samples in the same state, the dynamic elastic modulus decreases with the increase of freeze-thaw cycles, and its degree of decrease is different for different states. Under the same freeze-thaw cycles, the deterioration of mechanical properties of granite samples is different in four different weather states; for example, the dynamic elastic modulus from large to small is generally as follows: saturated and frozen states, saturated and normal temperature states, dry and frozen states, as well as dry and normal temperature states. Finally, the freeze-thaw influence factor is proposed to describe the damage of granite samples. All in all, it can be concluded that water and low temperature strengthen the influence of freeze-thaw cycles on the dynamic mechanical properties of granite.
机译：寒冷地区的岩石力学的机制引起了来自世界各地的研究人员的注意，这里的关注是在冻融循环下不可避免地削弱了岩体的力学性能。在本文中，首先，对花岗岩样品进行不同的冻融循环，然后在四种不同的状态下处理，例如饱和和冷冻状态，饱和和常温状态，干燥和冷冻状态，以及干燥和常温状态。使用拆分霍普金森压棒（SHPB）装置进行冲击压缩试验。结果表明，花岗岩样品的冲击强度随着相同状态的冻融循环的增加而恶化;对于不同状态的样品，虽然冻融循环的数量相等，但冲击强度的劣化程度不同。对于在同一状态下的冻结花岗岩样品，随着冻融循环的增加，动态弹性模量减少，不同状态的减少程度不同。在相同的冻融循环下，花岗岩样品的力学性能的劣化在四种不同的天气状态下不同;例如，大小小小的动态弹性模量通常如下：饱和和冷冻状态，饱和和常温状态，干燥和冷冻状态，以及干燥和常温状态。最后，提出了冻融影响因素来描述花岗岩样品的损伤。总而言之，可以得出结论，水和低温增强了冻融循环对花岗岩动态力学性能的影响。

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  • 来源
    《Environmental earth sciences》 |2021年第18期|661.1-661.12|共12页
  • 作者

    Ke Bo; Zhang Chunyang; Liu Chuanju; Ding Linmin; Zheng Yun; Li Ning; Wang Yixian; Lin Hang;

  • 作者单位

    Wuhan Univ Technol Sch Resources & Environm Engn Wuhan 430070 Peoples R China|Wuchang Univ Technol Sch Intelligent Construct Wuhan 430223 Hubei Peoples R China;

    Wuhan Univ Technol Sch Resources & Environm Engn Wuhan 430070 Peoples R China|Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomech & Geotech Engn Wuhan 430071 Peoples R China;

    Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomech & Geotech Engn Wuhan 430071 Peoples R China;

    Southwest Univ Sci & Technol Sch Environm & Resource Mianyang 621010 Sichuan Peoples R China|Changsha Inst Min Res Co Ltd Changsha 410012 Peoples R China;

    Wuchang Univ Technol Sch Intelligent Construct Wuhan 430223 Hubei Peoples R China;

    Wuhan Univ Technol Sch Resources & Environm Engn Wuhan 430070 Peoples R China;

    Hefei Univ Technol Sch Civil Engn Hefei 230009 Peoples R China;

    Cent South Univ Sch Resources & Safety Engn Changsha 410083 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Granite samples; Freeze-thaw cycles; Impact compression test; Impact strength; Dynamic elastic modulus; Freeze-thaw influence factor;

    机译：花岗岩样品;冻融循环;冲击压缩试验;冲击强度;动态弹性模量;冻融影响因子;

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