Failure characteristics of heated granite under different minor principal stresses: an experimental study

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-05-06 DOI:10.1007/s10064-025-04315-x

Jianqing Jiang, Huanjia Li, Jipeng Cai, Shihong Hu, Xiaochuan Hu, Benguo He

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Abstract

High temperature is a crucial external environmental factor that significantly affects rock failure. This study involved conducting true-triaxial compressive tests on heated granite specimens to examine the influence of heat treatment on granite failure under different minor principal stresses (σ₃ = 0.5, 5, and 15 MPa). The specimens were heated to the following maximum temperatures: 25 ℃ (without heat treatment), 100 ℃, 300 ℃, 500 ℃, and 600 ℃. The experimental results indicate that specimen strength first increased and then decreased as the maximum heating temperature increased from 25 ℃ to 600 ℃, reaching peak strength at 300 ℃, indicating an obvious effect of heat treatment on rock strength. High σ₃ enhanced the effect of heat treatment on rock strength. Additionally, the pre-peak strains indicated an obvious transition in specimen deformation characteristics from brittleness to ductility as the maximum heating temperature increased to about 500℃ under σ₃ = 0.5 MPa. However, this transition became less clear with increasing σ₃, indicating that σ₃ masks the effect of heating on rock deformation. Furthermore, the failure severity of the heated specimen first increased and then decreased as the maximum heating temperature increased. All tested specimens exhibited a mixed tensile-shear failure mode. When the maximum heating temperature was low, the failure mode of the tested specimens changed from mode I to mode II as σ₃ increased from 0.5 MPa to 15 MPa. When the maximum heating temperature was high, the failure mode changed from mode II to mode III with increasing σ₃.

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不同小主应力下受热花岗岩破坏特性的实验研究

高温是影响岩石破坏的重要外部环境因素。通过对加热后的花岗岩试样进行真三轴压缩试验，研究了不同小主应力（σ3 = 0.5、5和15 MPa）下热处理对花岗岩破坏的影响。试样被加热到以下最高温度：25℃（未经热处理），100℃，300℃，500℃和600℃。实验结果表明，随着最高加热温度从25℃升高到600℃，试样强度先升高后降低，在300℃达到峰值，表明热处理对岩石强度的影响明显。高σ3强化了热处理对岩石强度的影响。在σ3 = 0.5 MPa条件下，当最高加热温度提高到500℃左右时，峰前应变表现出试样变形特征由脆性向延性的明显转变。然而，随着σ3的增大，这种转变变得不那么明显，说明σ3掩盖了加热对岩石变形的影响。随着最高加热温度的升高，试样的破坏程度先增大后减小。所有试件均表现为拉剪混合破坏模式。当最高加热温度较低时，当σ3从0.5 MPa增加到15 MPa时，试件的破坏模式由I型转变为II型；当最高加热温度较高时，随着σ3的增大，失效模式由II型转变为III型；

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.