高温循环后花岗岩孔隙结构与物理力学特性演化规律研究

doi:10.13722/j.cnki.jrme.2022.1024

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摘要探究高温循环下岩石内部孔隙演化及其对物理力学特性的影响，对核废料地质处置、地热开发等地下工程的长期稳定性分析具有重要意义。为了定量分析高温循环对花岗岩孔隙结构及物理力学性质的影响，综合利用扫描电镜、差热分析等方法研究25 ℃～800 ℃高温循环下花岗岩的表面特征、质量、体积、纵波波速、抗拉强度、孔隙度、孔径分布和微观结构等演化规律。研究结果表明：(1) 随着温度升高，花岗岩的表面裂纹、色差、质量损失率、体积膨胀率、纵波波速衰减率不断增加，抗拉强度逐渐减小，当T＞500 ℃后，花岗岩的物理力学参数变化显著，在5次热循环后，岩石物理力学参数的变化更加明显。(2) 高温能够促进花岗岩孔隙发育，岩石内部微、小孔隙逐渐生长并连通形成中、大孔隙，造成岩石孔隙连通性增强，且热循环会进一步增加孔隙结构之间的连通性，导致中孔和大孔占比上升，孔隙率进一步增大。(3) 高温循环下花岗岩物理力学性质劣化与其内部孔隙结构的变化密切相关，质量损失率和体积膨胀率随等效平均孔隙半径的增大呈线性增加，纵波波速和抗拉强度随等效平均孔隙半径的增大呈指数型增加。(4) 高温下花岗岩会发生脱水、石英相变、矿物氧化、化学键断裂等物理化学反应，导致矿物颗粒产生沿晶裂纹、穿晶裂纹以及剥离缺陷，尤其在573 ℃石英相变后岩石结构损伤更为显著。(5) 热循环将造成岩石疲劳损伤，高温循环产生的交变热应力促进了微裂纹的增加和扩展，造成花岗岩损伤加剧。

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	古启雄1
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	黄震1
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	钟文1
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	李仕杰4
	吴云5
	巫宇帆1
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关键词 ：岩石力学, 花岗岩, 热循环, 孔隙结构, 孔隙度, 抗拉强度, 物理力学性质

Abstract：Exploring the evolution of pore structure inside rocks under high-temperature cycles and its influence on physical and mechanical properties is essential for long-term stability analysis of underground engineering，such as geological disposal of nuclear waste and geothermal development. In order to quantitatively analyze the effects of high-temperature cycling on the pore structure and physical and mechanical properties of granite，the evolution of surface characteristics，mass，volume，P-wave velocity，tensile strength，porosity，pore size distribution，and microstructure of granite under high-temperature cycling from 25 ℃ to 800 ℃ were investigated by a combination of nuclear magnetic resonance(NMR)，scanning electron microscopy(SEM) and thermogravimetric-differential thermal analysis(TG-DTA). The results show that：(1) With the increase of the temperature，the surface cracks，color difference，mass loss rate(Rm)，volume expansion rate (RV)，P-wave velocity attenuation rate(RP) of granite keep increasing，the tensile strength(σt) gradually decreases，and the physical and mechanical parameters of granite change significantly when T＞500 ℃. After five thermal cycles，the variations of physical and mechanical parameters of the rock are more prominent. (2) High temperature can promote the development of granite pores，and micropores and smallpores inside the rock gradually grow and connect to form mesopores and macropores，resulting in the enhancement of rock pore connectivity. Thermal cycling will further increase the connectivity between pore structures，leading to an increase in the proportion of mesopores and macropores and a further increase in porosity. (3) The deterioration of granite's physical and mechanical properties under high-temperature cycling is closely related to the changes in its internal pore structure. The Rm and RV increase linearly with the increase of the equivalent average radius of the pore(rT)，and the RP and σt increase exponentially with the increase of rT. (4) High-temperature granite will be water evaporation，quartz phase transformation，mineral oxidation，chemical bond fracture and other physicochemical reactions，resulting in intergranular cracks，transgranular cracks and peeling defects of mineral particles. Especially，the rock structure damage is more significant after quartz phase transformation at 573 ℃. (5) Thermal cycling will cause fatigue damage to the rock，and the alternating thermal stress generated by high-temperature cycling promotes the increase and expansion of microcracks，resulting in increased granite damage.

Key words： rock mechanics granite thermal cycle pore structure porosity tensile strength physico-mechanical properties

引用本文:

古启雄1，2，黄震1，2，钟文1，2，3，李仕杰4，吴云5，巫宇帆1，2. 高温循环后花岗岩孔隙结构与物理力学特性演化规律研究[J]. 岩石力学与工程学报, 2023, 42(6): 1450-1465.
GU Qixiong1，2，HUANG Zhen1，2，ZHONG Wen1，2，3，LI Shijie4，WU Yun5，WU Yufan1，2. Study on the variations of pore structure and physico-mechanical properties of granite after high temperature cycling. , 2023, 42(6): 1450-1465.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1024 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I6/1450

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