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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (5): 764-777.doi: 10.11872/j.issn.1005-2518.2022.05.058

• Mining Technology and Mine Management • Previous Articles     Next Articles

Study on Acoustic Emission and Microscopic Characteristics of Red Sandstone Under Compression-Shear After High Temperature

Xiaohui HUANG(),Kewei LIU(),Zhanxing ZHOU,Sizhou MA,Tengfei GUO   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2022-04-24 Revised:2022-05-31 Online:2022-10-31 Published:2022-12-10
  • Contact: Kewei LIU E-mail:195512092@csu.edu.cn;kewei_liu@126.com

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Abstract:

In underground rock engineering，such as deep resource mining and underground nuclear waste repository construction，high temperature is one of the important factors affecting the stability of rock engine-ering structure.Meanwhile，compression-shear stress state is one of the common stress states of rock in engine-ering.Therefore，the research on acoustic emission characteristics and shear fracture micro mechanism of red sandstone under variable angle shear after high temperature treatment is of great significance to monitor and analyze the stability of rock in high temperature rock engineering.By analyzing the acoustic emission characteristics of red sandstone treated at 25~800 ℃ during the shear failure，it can be concluded that high temperature changes the acoustic emission characteristics and related parameters in the shear failure process of red sandstone，including AE event count，b value，RA-AF value and so on.At the same time，based on the acoustic emission characteristics，the influence of high temperature treatment on the shear failure characteristics of red sandstone was analyzed.In addition，the micro mechanism of shear fracture of red sandstone after high temperature was analyzed by electron microscope scanning technology.The test results show that： （1） High temperature makes the change trend of acoustic emission event of red sandstone from indirect activities with low-activity under room temperature to continuous activities with high-density，and the peak value of AE cumulative event count increases with the increase of treatment temperature.（2） According to the distribution characteristics of acoustic emission parameter RA-AF value，it can be concluded that high temperature treatment changes the crack type of red sandstone in compression shear failure，and the proportion of shear crack increases with the temperature increasing.（3） The change trend of AE cumulative event count can be used to judge the shear stress threshold of pore compaction，crack initiation and crack damage.According to the distribution characteristics of the proportion of shear stress threshold，it can be concluded that with the increase of temperature，the proportion of stable crack propagation stage decreases，but the proportion of unstable crack propagation increases.（4） The shear damage characteristics of red sandstone after high temperature treatment were defined by AE cumulative event count.It was found that when the shear angle is 55°，the high temperature treatment can inhibit the development of shear damage of red sandstone，and promote it at 65°.（5） The compression-shear fracture of the samples treated at different temperatures is mainly formed by cleavage along the crystal （trans-granular fracture），but at 800 ℃，it is more prone to failure along the grain boundary，the number of residual dimples increases，the plasticity increases and the degree of fragmentation decreases.The research results can provide reference for solving the problems of high temperature geotechnical engineering.

Key words: high temperature treatment, variable angle shear, acoustic emission characteristics, stress threshold, damage characteristics, fracture morphology

CLC Number: 

  • TU457

Fig.1

Red sandstone sample and heat treatment equitment"

Fig.2

Shear and acoustic emission test system"

Fig.3

Variation of volume change rate and porosity of red sandstone with treatment temperature"

Fig.4

Shear stress-shear strain-acoustic emission curves of red sandstone after different temperatures treatment"

Fig.5

RA-AF scatter distribution of red sandstone with different shear angles at room temperature"

Fig.6

Variation trend of shear crack proportion with treatment temperature corresponding to different C0 values"

Fig.7

Proportion of crack types of red sandstone after different temperature treatment under different shear angles"

Fig.8

Proportion of shear stress threshold at different shear anlges"

Fig.9

Damage variation-time curves at different shear angles"

Fig.10

SEM images of shear fracture of red sandstone samples after different temperature treatment （65° shear angle）"

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