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Mechanical behavior of Beishan granite samples with different slenderness ratios at high temperature

机译：北山花岗岩样品在高温下具有不同细长比的北山花岗岩样品的力学行为

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摘要

This paper aims at the temperature and slenderness ratio effects on physical and mechanical properties of Beishan granite. A series of uniaxial compression tests with various slenderness ratios and temperatures were carried out, and the acoustic emission signal was also collected. As the temperature increases, the fracture aperture of intercrystalline cracks gradually increases, and obvious transcrystalline cracks occurs when T 600 degrees C. The failure patterns change from tensile failure mode to ductile failure mode with the increasing temperature. The elastic modulus decreases with the temperature and increases with slenderness ratio, then tends to be a constant value when T = 1000 degrees C. However, the peak strain has the opposite evolution as the elastic modulus under the effects of temperature and slenderness ratio. The uniaxial compression strength (UCS) changes a little for the low-temperature specimens of T 400 degrees C, but a significant decrease happens when T = 400 degrees C and 800 degrees C due to phase transitions of mineral. The evolution denotes that the critical brittle-ductile transition temperature increases with slenderness ratio, and the critical slenderness ratio corresponding to the characteristic mechanical behavior tends to be smaller with the increasing temperature. Additionally, the AE quantity also increases with temperature in an exponential function.
机译：本文旨在北山花岗岩物理和力学性能的温度和细长效应。进行了一系列具有各种细长比率和温度的单轴压缩测试，并且还收集声发射信号。随着温度升高，肾间裂缝的断裂孔径逐渐增加，当T＆GT时，发生明显的经晶裂缝。 600℃。故障模式随温度越来越大的拉伸失效模式变为延展性故障模式。弹性模量随温度的温度降低并随着细长比而增加，当T = 1000℃时，趋于恒定值。然而，峰值应变具有在温度和细长比的影响下作为弹性模量的相反演化。单轴压缩强度（UCS）改变T＆LT LT的低温样本。 400℃，但由于矿物的相位过渡导致T = 400摄氏度和800摄氏度，发生显着降低。进化表示，临界脆性转变温度随着狭长率的增加而增加，与越来越大的温度趋于较小的临界纤细比对应的临界细长比趋于更小。另外，AE量也随着指数函数的温度而增加。

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  • 来源
    《Geomechanics and engineering》 |2021年第2期|157-166|共10页
  • 作者

    Zhang Qiang; Li Yanjing; Min Ming; Jiang Binsong;

  • 作者单位

    China Univ Min & Technol Sch Mech & Civil Engn State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mech & Civil Engn State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

    Huazhong Univ Sci & Technol Sch Civil & Hydraul Engn Wuhan 430074 Peoples R China;

    China Univ Min & Technol Sch Mech & Civil Engn State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

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

    rock; mechanical behavior; acoustic emission; high temperature; slenderness ratio;

    机译：岩石;机械行为;声发射;高温;细长比率;

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