Real-time experiment investigations on the coupled thermomechanical and cracking behaviors in granite containing three pre-existing fissures
Real-time experiment investigations on the coupled thermomechanical and cracking behaviors in granite containing three pre-existing fissures
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含有三个预存裂隙的花岗岩热力与开裂耦合行为的实时实验研究
DOI：
10.1016/j.engfracmech.2019.106797
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发表时间：
2020-02
影响因子：
5.4
通讯作者：
Ma Hai-Chun
中科院分区：
文献类型：
--
作者：
Zhou Xiao-Ping;Li Guo-Qing;Ma Hai-Chun
本文研究了含三个裂隙的花岗岩在单轴压缩下的实时耦合热-力学行为。韧带角度范围为75°~ 120°，间隔为15°，测试温度范围为25℃~ 700℃。首先考虑花岗岩的强度和变形是温度和韧带角度的函数。花岗岩的弹性模量在400℃时大幅降低，花岗岩的单轴抗压强度在600℃时大幅降低。花岗岩试样的断裂行为不仅与温度有关，还与裂缝排列有关。对于较小的韧带角，裂缝的聚结模式只取决于韧带角，而对于较大的韧带角，裂缝的聚结模式同时取决于韧带角和温度。花岗岩试样在25 ~ 300℃时主要表现为拉伸破坏模式，300℃时发生脆性-韧性转变，300 ~ 400℃时表现为拉剪混合破坏模式，剪切破坏模式atT= 400 ~ 700℃。此外，还通过薄片观察和电镜扫描对花岗岩的热损伤进行了分析。花岗岩的热致微裂纹主要包括晶间裂纹和晶内裂纹，在400 ~ 700℃时发生较多。电子探针微量分析仪（EPMA）实验结果表明，温度对花岗岩的物理性质影响较大，而矿物的化学成分保持不变（25 ~ 700℃）。高温对花岗岩微观结构的破坏是由物理变化而不是化学变化引起的。
This paper investigates the coupled thermomechanical (TM) behavior, in real time, of granite containing three pre-existing fissures under uniaxial compression. The ligament angle spans from 75° to 120° with an interval of 15°, and the testing temperature varies from 25 °C to 700 °C. The strength and deformation of the granite are first considered as functions of the temperature and the ligament angle. The elastic modulus of the granite greatly decreases at 400 °C, and uniaxial compression strength of the granite substantially decreases at 600 °C. The fracturing behavior of the granite specimens depends on not only the temperature but also the fissure array. For relatively small ligament angles, the crack coalescence pattern only depends on the ligament angle, while for relatively large ligament angles, the crack coalescence pattern depends on both the ligament angle and the temperature. The granite specimens mainly exhibit tensile failure modes at 25–300 °C, the brittle-ductile transition occurs at 300 °C, the granite specimens experience a mixed tensile-shear failure mode at 300–400 °C, and they experience a shear failure mode atT= 400–700 °C. Moreover, the thermal damage of the granite is analyzed by thin section observation and electron microscopy scanning (SEM). Thermally induced micro-cracks in the granite mainly include intercrystalline cracks and intracrystalline cracks, which occur dramatically atT= 400–700 °C. Electron probe micro analyzer (EPMA) experimental results show that the physical properties of the granite are considerably affected by temperature, while the chemical composition of the minerals remains unchanged atT= 25–700 °C. The damage to the microstructure of the granite at high temperatures is caused by physical changes rather than chemical changes.
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影响因子：
6.2
作者：
Liang, W. G.;Xu, S. G.;Zhao, Y. S.
通讯作者：
Zhao, Y. S.
DOI：
10.1016/j.ijrmms.2016.11.016
发表时间：
2017
影响因子：
7.2
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Rathnaweera, T. D.
影响因子：
2.2
作者：
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通讯作者：
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