scholarly journals Study on damage evolution characteristics of coal and rock uniaxial compression based on the acoustic emission

2016 ◽  
Author(s):  
Shugang Li ◽  
Ning Wang ◽  
Tianjun Zhang
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Evolution Characteristics

Damage Evolution Analysis of Calcareous Mudstone with Different Water Content under Uniaxial Compression

2010 ◽  
Vol 168-170 ◽  
pp. 1388-1395
Author(s):  
Ming Ji ◽  
Nong Zhang ◽  
Feng Gao
Keyword(s):  
Acoustic Emission ◽  
Water Content ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Testing Machine ◽  
Strain Curve ◽  
Peak Stress ◽  
Damage Evolution Equation ◽  
Emission Activity ◽  
Hydraulic Servo

Uniaxial compression and acoustic emission experiments of calcareous mudstone with different water content were carried out by using microcomputer controlled electro-hydraulic servo compression testing machine control system of YAW series equipped by coal-rock acoustic and electric data acquisition system of CTA-1-type. Mchanical properties and acoustic emission law of calcareous mudstone were studied. It is concluded from experiment result that rock’s elastic modulus and compressive strength both decrease with increase water content but peak stress shows the opposite trend. It is also found that calcareous mudstone is brittleness with low water content but when water content reaches saturation, calcareous mudstone presents plastic features. Acoustic emission curve fits well with stress-strain curve: acoustic emission activity begins intensifying when stress reaches 70% of peak stress, correspondingly, acoustic emission is up to maximum at peak stress. Based on Weibull hypothesis and acoustic emission experiment, damage law of water bearing calcareous mudstone is researched and damage evolution equation with time variable is advanced.

Research on Landscape Limestone Damage and Deformation under Uniaxial Compression Based on Acoustic Emission

2013 ◽  
Vol 423-426 ◽  
pp. 914-919 ◽  
Author(s):  
Yong Qin Xiao ◽  
Yi Ping Wan ◽  
Bao Xian Liu
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Detection System ◽  
Damage Model ◽  
Mechanical Damage ◽  
Test System ◽  
Emission Feature ◽  
Internal Damage ◽  
Emission Parameter

In order to establish the relation between acoustic emission parameter and rock mechanical damage mechanism, as well as to better figure out landscape limestone damage and deformation influenced by uniaxial compression, MTS815 rock mechanical electro-hydraulic servo test system and 8CHSPCI-2 acoustic emission and detection system are applied to implement a test and research on damage evolution of limestone under uniaxial compression and the corresponding acoustic emission feature. On this basis, the acoustic emission feature of limestone under uniaxial compression is analyzed. Moreover, based on the damage variable of normalized accumulated emission ringing count, the uniaxial compression limestone damage model based on acoustic emission feature is established, and the damage evolution curve and equation of limestone is figured out as well. Shown by the research, acoustic emission information reflects the internal damage of limestone, and is closely related with densification of inner original fracture, as well as emerging, developing, and merging of new fractures. The acoustic emission feature of limestone perfectly describes its deformation and damage evolution.

Study on Energy Accumulation and Damage Evolution of the Coal and Rock Using Acoustic Emission Test

2011 ◽  
Vol 105-107 ◽  
pp. 1597-1602 ◽  
Author(s):  
You Gang Wang ◽  
Xiang Feng Liu
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Solid Material ◽  
Damage Variable ◽  
Geometrical Parameters ◽  
Compression Process ◽  
Energy Accumulation ◽  
Ae Energy

Rocks and other rocklike solid materials have inherent defects inside. The defects of rock will be evolved under loading. The evolution process and extent of defects can be described by the damage variable. But which physical or geometrical parameters can be used to define the damage, there has no consistent conclusion domestic and aboard. Moreover, limited by the method of experimental, it is difficult to obtain the parameters to depict the damage variable directly. In order to obtained the evolution law of the interior defects in the solid material, the non-conduct geophysical prospecting measure as AE (Acoustic Emission) will be the leading measure to prospect the interior defects and it’s evolution under outside loading. In the present paper, the AE method was used to obtain the AE parameters during the uniaxial compression process of coal and rock. Therefore, uniaxial compression and AE tests on coal and mudstone were conducted, and the curves among the AE energy accumulation, stress and strain were obtained after analyzing the results of tests data. Based on the principle of damage mechanics and thermodynamics, the damage evolution of coal and rock was deduced through analyzing the experimental results, the curves of damage and AE accumulation were obtained also. By analyzing and fitting the curves of damage and AE energy accumulation, the relation between the AE energy accumulation and stress-strain was obtained and verified through the experimental data.

scholarly journals Researches on Damage Evolution and Acoustic Emission Characteristics of Rocks

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yong Chen ◽  
Yugui Yang ◽  
Feng Gao ◽  
Xiangxiang Zhang
Keyword(s):  
Acoustic Emission ◽  
Elastic Modulus ◽  
Damage Evolution ◽  
Constitutive Relations ◽  
Damage Model ◽  
Petroleum Reservoir ◽  
Evolution Characteristics ◽  
Damage Constitutive Model ◽  
Rock Specimens ◽  
Statistical Damage

Mechanical parameters of the rock are important for the design of geotechnical, mining engineering, and petroleum reservoir projects. Many researches have suggested that the mechanical variables of rock specimens, such as compressive strength and elastic modulus, do not have a single fixed value. Uncertainty in the basic mechanical variables of the rock material can significantly affect the structural performance and safety. In this study, a series of compression experiments with acoustic emission have been performed on rock specimens. The damage evolution characteristics of the rock in the process of loading were studied, and the macromechanical behaviors were obtained at the same time. Distribution characteristics of the strength and elastic modulus as random variables are illustrated, and the statistical damage model is presented by the authors to formulate analytical constitutive relations for deformation behavior. The comparisons between predicted results and experimental data show that the statistical damage constitutive model could well reproduce the deformation process of rock materials.

Damage evolution of phyllite based on uniaxial compression and acoustic emission tests

2021 ◽  
Vol 14 (19) ◽  
Author(s):  
Rui Wang ◽  
Chenke Sun ◽  
Xianghui Deng ◽  
Yuncai Wang ◽  
Kai Long
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Damage Evolution

Test Study of the Damage-Fractured Process for Double Fractured Rock

2012 ◽  
Vol 490-495 ◽  
pp. 683-687
Author(s):  
Guo Yan Wang ◽  
Ming Wu Dou ◽  
Shu Chen Li
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Rock Mechanics ◽  
Damage Evolution ◽  
Rock Strength ◽  
Fractured Rock ◽  
Engineering Application ◽  
Threshold Value ◽  
Test Study ◽  
Monitoring Test

Based on the rock mechanics test systems and the monitoring test of the acoustic emission (AE), the damage –fractured process for the double fractured rock is studied in order to gain the characteristics of deformation and damage evolution for the double fractured rock under the uniaxial compression. The damage evolution threshold value and the damage interpretation about the full stress-stain curve are given and the influence of initial damage on rock strength is analyzed. The results provide experimental foundation for engineering application.

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