高温花岗岩水冷却后物理力学特性及微观破裂特征

doi:10.16285/j.rsm.2020.1383

岩土力学 ›› 2021, Vol. 42 ›› Issue (6): 1568-1578.doi: 10.16285/j.rsm.2020.1383

高温花岗岩水冷却后物理力学特性及微观破裂特征

贾蓬^{1, 2}，杨其要¹，刘冬桥²，王述红¹，赵永¹

1. 东北大学资源与土木工程学院，辽宁沈阳 110819；2. 中国矿业大学（北京）深部岩土力学与地下工程国家重点实验室，北京 100083

收稿日期:2020-09-14 修回日期:2021-03-02 出版日期:2021-06-11 发布日期:2021-06-15
作者简介:贾蓬，女，1973年生，博士，副教授，硕士生导师，主要从事深部岩石力学与工程方面的教学与研究。
基金资助:
国家自然科学基金（No.U1710253，No.U1903216，No.52004052）；中央高校基本科研业务专项资金（No.N180701005）；中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金（No.SKLGDUEK1920）；辽宁省重点科技计划项目（No.2019JH2/10100035）。

Physical and mechanical properties and related microscopic characteristics of high-temperature granite after water-cooling

JIA Peng^{1, 2}, YANG Qi-yao¹, LIU Dong-qiao², WANG Shu-hong¹, ZHAO Yong¹

1. School of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Received:2020-09-14 Revised:2021-03-02 Online:2021-06-11 Published:2021-06-15
Supported by:
This work was supported by the National Natural Science Foundation of China(U1710253，U1903216，52004052), the Fundamental Research Funds for the Central Universities(N180701005), and the Open Funds of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing(SKLGDUEK1920) and the Key Research and Development Program of Science and Technology in Liaoning Province (2019JH2/10100035).

摘要/Abstract

摘要： 为研究热储层建造时高温岩体水冷却后的物理力学特性及其微细观破裂特征，对常温、200、400、600、800 ℃ 5个组别的花岗岩样进行水冷却冲击后的岩样开展单轴压缩试验，结合超声波无损检测、XRD衍射和偏光显微镜观察等手段，对其宏、微观破裂特征进行分析。结果表明，随温度升高，高温花岗岩水冷却后的单轴抗压强度峰值不断降低，峰值应变不断增大，岩样破坏由突发性破坏向渐进性破坏转变；岩样的质量损失率、体积增长率和密度降低率均随温度升高而增加，波速随温度升高而降低，在400～600 ℃之间水冷却岩样体积膨胀率随温度升高显著增加，600～800 ℃岩样的波速衰减率幅度减小；温度梯度越大，热冲击导致的穿晶裂纹越多，大量沿晶裂纹和穿晶裂纹导致岩样单轴压缩破坏由张剪复合破坏转变为剪切破坏为主，破坏时伴有大量粉末状碎屑的主要原因。

关键词: 高温花岗岩, 水冷却, X射线衍射, 损伤劣化, 超声波

Abstract: In order to understand the deterioration of physical and mechanical properties of high-temperature rocks, and the related microscopic characteristics after water-cooling during the thermal reservoir construction, uniaxial compression tests were conducted on five groups of granite samples, which at normal temperature and 200, 400, 600, and 800 ℃ had experienced water-cooling shocks, respectively. Ultrasonic testing, XRD and polarizing microscope observation were adopted to analyze the microscopic failure mechanics of rocks. Results show that with the increase of rock temperature, the peak strength decreases gradually with an increase of the peak strain, and the failure mode changes from sudden brittle failure to progressive failure. The mass loss rate, volume expansion rate, and density reduction rate increase with the increase of temperature, except for the ultrasonic wave velocity. The volume expansion rate of cooled rock samples increases significantly when the temperature ranges from 400 ℃ to 600 ℃, and the attenuation rate of wave-velocity of rock samples decreases when the temperature ranges from 600 ℃ to 800 ℃. It is found that the larger the temperature gradient, the more the transgranular cracks form due to the water-cooling shocks. A large number of transgranular and intergranular cracks cause the failure modes of rock samples under uniaxial compression to change from tension-shear failure to shear dominant failure accompanied by a large amount of powdery debris.

Key words: high-temperature granite, water-cooling, X-ray diffraction, damage deterioration, ultrasonic wave

中图分类号:

TU452

贾蓬, 杨其要, 刘冬桥, 王述红, 赵永, . 高温花岗岩水冷却后物理力学特性及微观破裂特征[J]. 岩土力学, 2021, 42(6): 1568-1578.

JIA Peng, YANG Qi-yao, LIU Dong-qiao, WANG Shu-hong, ZHAO Yong, . Physical and mechanical properties and related microscopic characteristics of high-temperature granite after water-cooling[J]. Rock and Soil Mechanics, 2021, 42(6): 1568-1578.

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高温花岗岩水冷却后物理力学特性及微观破裂特征

Physical and mechanical properties and related microscopic characteristics of high-temperature granite after water-cooling

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