Experimental study on mechanical damage and creep characteristics of Gonghe granite under real-time high temperature

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-07-05 DOI:10.1016/j.geothermics.2024.103100
Zhenhua Xu , Xiuping Zhong , Shanling Zhang , Yafei Wang , Kunyan Liu , Xiang Liu , Yuxuan Meng , Xinglan Hou , Chen Chen
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Abstract

It is significant to study the mechanical properties of hot dry rock (HDR) for the development of deep geothermal energy. At present, the creep behavior of granite under real-time high temperature is not fully understood. The creep behavior of granite at 25 ∼ 800°C was investigated by real-time high-temperature uniaxial compression and graded load creep tests, and the thermal damage mechanism of granite was studied by scanning electron microscopy (SEM) experiments. The paper systematically analyzes the evolution of mechanical indexes such as uniaxial compressive strength (UCS), elastic modulus, creep deformation, steady creep rate and long-term strength of granite under thermal-force coupling. The results show that the UCS and elastic modulus of granite increase with increasing temperature in the range of 25 ∼ 200 °C, and decrease with increasing temperature in the range of 200 ∼ 800 °C. The damage speed of granite is the fastest in the temperature range of 400 ∼ 600 °C. The steady creep rate of granite increases with the increase of temperature and stress level. The ratio of long-term strength to UCS decreases with increasing temperature, from 93.6% at 25 °C to 73.2% at 800 °C. The research results provide relevant thermal damage mechanical parameters and theoretical basis for the development of HDR.

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实时高温条件下共和花岗岩力学损伤和蠕变特性的实验研究
研究热干岩(HDR)的力学性能对开发深层地热能源意义重大。目前,人们对花岗岩在实时高温下的蠕变行为还不完全了解。本文通过实时高温单轴压缩和分级载荷蠕变试验研究了花岗岩在 25 ∼ 800 ° C 下的蠕变行为,并通过扫描电子显微镜(SEM)实验研究了花岗岩的热损伤机理。论文系统分析了花岗岩在热-力耦合作用下的单轴抗压强度(UCS)、弹性模量、蠕变变形、稳定蠕变速率和长期强度等力学指标的演变过程。结果表明,花岗岩的单轴抗压强度和弹性模量在 25 ∼ 200 ℃范围内随温度升高而增加,在 200 ∼ 800 ℃范围内随温度升高而减小。在 400 ∼ 600 °C 的温度范围内,花岗岩的破坏速度最快。花岗岩的稳定蠕变速率随温度和应力水平的增加而增加。长期强度与 UCS 之比随着温度的升高而降低,从 25 °C 时的 93.6% 降至 800 °C 时的 73.2%。研究结果为开发 HDR 提供了相关的热损伤力学参数和理论依据。
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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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