Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions

He, Man; Miao, Junxiang; Feng, Junjun

doi:10.1016/j.ijrmms.2009.09.003

Cited by 703 publications

(223 citation statements)

References 17 publications

Supporting

Mentioning

215

Contrasting

Unclassified

Order By: Relevance

“…Pillar instability means rupture when external load reaches ultimate value, compression-shear damage or splitting damage is occurred in the pillar under uniaxial stress until the pillar lose bearing capacity and all pillars cannot resist the mine pressure of roof [7] . Accompanying these processes, an elastic stress wave is generated, which travels from the point of origin within the rocks to a boundary, where it is observed as an AE signal [9] . In rock, acoustic emission is generated by crack formation under high stress [10] .…”

Section: A Analysis Of Pillar Failure Under Different Pillar Width Tmentioning

confidence: 99%

Numerical Analysis on Orebodies Failure under Shear Loading

Wang¹,

Tian²,

Zhang³

2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

View full text Add to dashboard Cite

Section: A Analysis Of Pillar Failure Under Different Pillar Width Tmentioning

confidence: 99%

Numerical Analysis on Orebodies Failure under Shear Loading

Wang¹,

Tian²,

Zhang³

2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

View full text Add to dashboard Cite

“…In recent years, AE detection technology has been used in rock mechanics by many scholars [20][21][22][23][24][25][26][27]. For example, Ganne et al [20] studied the brittleness of rock before peak stress by the AE technique, and four stages of accumulated AE energy were given.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Acoustic emission (AE) signals can be detected from rocks under the effect of temperature and loading, which can be used to reflect rock damage evolution process and predict rock fracture. In this paper, uniaxial compression tests of granite at high temperatures from 25°C to 1000°C were carried out, and AE signals were monitored simultaneously. e results indicated that AE ring count rate shows the law of "interval burst" and "relatively calm," which can be explained from the energy point of view. From 25°C to 1000°C, the rock failure mode changes from single splitting failure to multisplitting failure, and then to incomplete shear failure, ideal shear failure, and double shear failure, until complete integral failure. ermal damage (D T ) defined by the elastic modulus shows logistic increase with the rise of temperature. Mechanical damage (D M ) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

show abstract

“…Some achievements have already been made. For example, He et al [1][2][3][4] made a study concerning the acoustic properties under true triaxial rock unloading conditions. Xu et al [5] used the MTS press and acoustic emission system to monitor rock mechanics and acoustic properties under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Xiao

Gang

Qianlong

2018

Shock and Vibration

View full text Add to dashboard Cite

e research adopts the French ROCK600-50 three-axis experiment instrument and SH-II system to evaluate the acoustic emission (AE) peak of the rear axle of yellow sandstone by carrying out the confining pressure synchronous unloading experiment, and evolution of mechanical properties and characteristics of energy transformation and damage of a yellow sandstone, which is a twodamage process, the results of which have shown the following: (1) there are two damages appearing when the confining pressure is 5 MPa, 10 MPa, and 20 MPa. In contrast, these two damages do not appear when the confining pressure is 30 MPa and 40 MPa. e fracture degree and crack number of the two fractures are larger than those without two damages. (2) A failure stress release rate showed an obvious "√" trend. With the increase of confining pressure, the stress release rate of the two failures is increasing. (3) By keeping the strain of the body constant, it is determined to be the first time to destroy the warning. e two failures of rock are predicted by the inflection point of the axial strain slope. No two failures occurred, and the strain unloading process showed two characteristics. (4) Meanwhile, with the increase of confining pressure, the energy released from the peak decreases first and then increases; the law of releasing energy from one failure and two destructions is the opposite. No damage occurred two times. As the confining pressure increases, there is a continuous decrease of the energy released from the peak. As the confining pressure increases, the release rate of the primary energy decreases at first and then increases, and the rate of energy released two times is increasing. e plasticity coefficient shows the trend of increasing first and then decreasing. (5) e damage degree of the second rupture is greater than the first rupture.

show abstract

Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions

Cited by 703 publications

References 17 publications

Numerical Analysis on Orebodies Failure under Shear Loading

Numerical Analysis on Orebodies Failure under Shear Loading

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Contact Info

Product

Resources

About