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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (2): 222-232.doi: 10.11872/j.issn.1005-2518.2022.02.167

• Mining Technology and Mine Management • Previous Articles     Next Articles

Research on Dynamic Mechanical Properties of Heat-treated Granite Under Impact Loading

Shengquan ZHOU1(),Rui WANG1,Nuocheng TIAN2,Dongwei LI3   

  1. 1.School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China
    2.College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, Zhejiang, China
    3.School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, Jiang -xi, China
  • Received:2021-11-12 Revised:2022-02-21 Online:2022-04-30 Published:2022-06-17

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Abstract:

In order to study the influence of impact velocity and heat treatment temperature on the dynamic mechanical properties of biotite granite，the improved Hopkinson Pressure Bar system was used to conduct impact compression tests on the heat-treated granite at 25~800 ℃ under three impact velocities.The experiment results show that with the impact velocity increasing，the stress-strain curves of the heat-treated samples at 25~700 ℃ change from “type Ⅱ” to “type Ⅰ”.But the heat-treated samples at 800 ℃ all show the “type Ⅰ” stress-strain curve.The peak stress，average strain and peak strain of the sample at the same temperature increase with the impact velocity increasing，showing obvious loading rate effect.The elastic modulus does not change much with the impact velocity，and the loading rate effect is not obvious.Under the same impact velocity，the dynamic properties of the heat-treated samples at 300 ℃ are improved.After 500 ℃，the dynamic properties of the samples begin to gradually deteriorate，and the heat-treated samples at 800 ℃ have the weakest dynamic properties.The relationship between peak stress，average strain rate，peak strain and elastic modulus and heat treatment temperature can be expressed by single exponential function.Under the same treatment temperature，the damage degree of granite increases with the increase of impact velocity.Under the same impact velocity，the fragmentation degree of the heat-treated sample at 300 ℃ is the smallest，and the heat-treated sample at 800 ℃ is the most serious.From the field emission scanning electron microscope image，it can be seen that the fundamental reason for the change of rock macro mechanical properties is that the temperature changes the microstructure inside the rock.

Key words: granite, heat treatment, SHPB system, impact velocity, dynamic characteristics, failure mode

CLC Number: 

  • TU458

Fig.1

XRD pattern of biotite granite"

Fig.2

Granite sample after heat treatment"

Fig.3

Improved SHPB system"

Fig.4

Stress balance diagram"

Fig.5

Stress-strain curves of heat-treated samples at different temperatures under three projectile velocities"

Fig.6

Relationship between peak stress and temperature under different projectile velocities"

Fig.7

Relationship between average strain rate and temperature under different projectile velocities"

Fig.8

Relationship between peak strain and temperature under different projectile velocities"

Fig.9

Relationship between elastic modulus and temperature under different projectile velocities"

Fig.10

Variation of fragmentation morphology with temperature under three projectile velocities"

Fig.11

FESEM images of granite after heat treatment"

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