Abstract
Based on the research background of the damage of high-temperature jointed rock masses, this paper studies the mechanical properties of jointed granite under high-temperature conditions and analyzes the failure law of jointed rock masses with increasing temperature, decreasing temperature and types of joints. The results have important scientific and engineering value. The main research results are as follows: (1) high-temperature conditions change the mechanical properties of granite, especially when the temperature is higher than 400 °C, and the peak stress of granite decreases sharply; the change rate of the mechanical parameters of granite under the condition of water cooling is higher than that under the condition of natural cooling. (2) The uniaxial compressive strength of jointed granite increases with increasing angle α between the joint and the maximum principal plane, and the peak strength of intact granite is higher than that of jointed granite with either conjugate or echelon joints (referred to as conjugate or echelon jointed granite here). (3) The conjugate jointed granite exhibits three failure modes, in which the fractures are all tensile fractures; the echelon jointed granite exhibits three failure modes, most of which include tensile and shear fracturing.
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Abbreviations
- T :
-
Treatment temperature (°C)
- t :
-
Time of heating/cooling treatment (min)
- α :
-
Angle between joint and horizontal plane (°)
- 2a :
-
Length of joint (mm)
- 2b :
-
Length of rock bridge (mm)
- l :
-
Length of granite specimen (mm)
- d :
-
Width of granite specimen (mm)
- h :
-
Thickness of granite specimen (mm)
- σ p :
-
Peak stress (MPa)
- ε p :
-
Peak strain (%)
- E :
-
Elastic modulus (GPa)
- σ c -T/σ c-25 :
-
Ratio between the strength of jointed granite and that at 25 °C
- σ c -α/σ c-30 :
-
Ratio between the strength of jointed granite and that with α = 30°
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Grant Nos. 41672279, 41972288) and the National Key Research and Development Program of China (Grant No. 2019YFC1509702). We also thank the technicians who helped during the experiments and the anonymous reviewers for their constructive comments.
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Zhao, F., Shi, Z. & Sun, Q. Fracture Mechanics Behavior of Jointed Granite Exposed to High Temperatures. Rock Mech Rock Eng 54, 2183–2196 (2021). https://doi.org/10.1007/s00603-021-02393-3
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DOI: https://doi.org/10.1007/s00603-021-02393-3