高温后花岗岩微观特征及其对强度影响规律研究

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摘要高温条件下岩石物理力学特性是深部干热岩地热开采的重要参数。为揭示高温作用后花岗岩微观孔隙特征及其对强度的影响规律，综合采用CT扫描、压汞测试及偏光显微观察，分析高温对花岗岩微裂纹密度、孔径组成以及粒径分布的影响，开展高温后花岗岩单轴压缩及巴西劈裂试验，探究花岗岩单轴压缩强度、弹性模量、拉伸强度及压拉强度比随温度的变化规律。试验结果表明：(1) 随着温度升高，花岗岩试样单轴抗压强度、弹性模量以及拉伸强度逐渐减小，而压拉强度比呈先增大后减小趋势。(2) 随着温度升高，花岗岩试样微裂纹从零星分散向交汇贯通转变，裂纹的开度及连通度增强。微裂纹面积及微裂纹密度呈增大趋势，而且较小孔逐渐向较大孔转化。(3) 高温作用下花岗岩首先产生沿晶裂纹，随温度升高，沿晶裂纹和穿晶裂纹数量增多，晶粒尺寸增大，内摩擦角呈先增大后减小，可能是引起花岗岩压拉强度比随温度变化的原因。研究结论有助于揭示岩石高温劣化机制，可为深部干热岩地热开采提供一定参考。

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	黄彦华1
	2
	张坤博1
	杨圣奇1
	2
	3
	4
	田文岭1
	2
	朱振南1
	2
	印昊1
	李明旭1

关键词 ：岩石力学, 压拉强度比, 微裂纹, 孔径分布, 晶粒尺寸

Abstract：The physical and mechanical properties of rocks under high temperature conditions are the important parameters of geothermal exploitation of deep dry hot rock(DHR). To reveal the microstructure characteristic and its influence on strength properties of granite specimens after high temperature，the micro crack density，pore composition and grain size distribution were analyzed by using CT scanning，mercury intrusion porosimetry and thin section. Uniaxial compression and Brazilian splitting tests of granite after high temperature were carried out，and the evolution laws of uniaxial compression strength(UCS)，elastic modulus，Brazilian tensile strength(BTS) and UCS/BTS ratio of granite specimens were explored. The experimental results show that：(1) as the temperature increases，the UCS，elastic modulus and BTS of granite specimens decrease，while the UCS/BTS ratio first increases and then decreases. (2) Microcracks in the thermally-treated granite specimen shift from scattered to intersecting and penetrating，and the opening and connectivity of the cracks increase with the increase of temperature. Furthermore，the microcrack area and density increase，and the smaller pores gradually transform into larger pores. (3) Intergranular cracks firstly appear in granite under high temperature，and the number of intergranular and transgranular cracks increases with increasing temperature. Moreover，the grain size increases，and internal friction angle first increases and then decreases，which is the reason for the evolution of UCS/BTS ratio of thermally-treated granite. The conclusions help to reveal the degradation mechanism of rock induced by high temperature and provide reference for geothermal exploitation of deep DHR.

Key words： rock mechanics ratio of compression to tensile strength microcracks pore size grain size

引用本文:

黄彦华1，2，张坤博1，杨圣奇1，2，3，4，田文岭1，2，朱振南1，2，印昊1，李明旭1. 高温后花岗岩微观特征及其对强度影响规律研究[J]. 岩石力学与工程学报, 2025, 44(2): 359-372.
HUANG Yanhua1，2，ZHANG Kunbo1，YANG Shengqi1，2，3，4，TIAN Wenling1，2，ZHU Zhennan1，2，YIN Hao1，LI Mingxu1. Study on the microstructure characteristic and its influence on strength properties of granite specimens after high temperature treatment. , 2025, 44(2): 359-372.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I2/359

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