scholarly journals The Crack Evolution and Damage Development of Coal Uniaxial Compression Failure under Different Gas Pressure

2015 ◽  
Author(s):  
Peibo Han
Keyword(s):  
Uniaxial Compression ◽  
Gas Pressure ◽  
Crack Evolution ◽  
Damage Development ◽  
Compression Failure

scholarly journals Experimental Study on the Uniaxial Compression Failure and Ultrasonic Transmission of Brittle Shale Considering the Bedding Effect

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 217883-217896
Author(s):  
Jie Liu ◽  
Yongli Zhang ◽  
Xinle Yang ◽  
Chang Su
Keyword(s):  
Experimental Study ◽  
Uniaxial Compression ◽  
Compression Failure

scholarly journals Investigation on the pore characteristics of coal specimens with bursting proneness

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yutao Li ◽  
Yaodong Jiang ◽  
Bo Zhang ◽  
Honghua Song ◽  
Wenbo Dong ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Nitrogen Adsorption ◽  
Pore Characteristics ◽  
Pore Connectivity ◽  
Mercury Intrusion ◽  
Compression Failure ◽  
Pore Compressibility ◽  
Before And After ◽  
Compressibility Coefficient ◽  
Insight Into

Abstract To achieve further insight into the pore characteristics, the coal specimens with different bursting proneness before and after uniaxial compression failure are tested and compared in this paper. The data of mercury intrusion test is corrected by that of low-temperature nitrogen adsorption and desorption test (LTNAD). The pore size distribution and pore volume of specimens are obtained. The pore compressibility coefficient is determined based on the fractal dimension of pore. Scanning electron microscope (SEM) and computed tomography (CT) are combined to evaluated the pore connectivity. The value of pore compressibility coefficient of specimens with high bursting proneness is larger than that of medium bursting proneness. It means more compressibility and abrupt failure under stress. The researches of both SEM and CT indicate that the pore connectivity of specimens with medium bursting proneness is better. The results show that great differences exist in the pore characteristics of specimens with high and medium bursting proneness, and uniaxial compression failure exacerbates the complexity of pore characteristics.

scholarly journals Research on crack evolution law and macroscopic failure mode of joint Phyllite under uniaxial compression

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiangbo Xu ◽  
Dongyang Fei ◽  
Yanglin Yu ◽  
Yilun Cui ◽  
Changgen Yan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Failure Mode ◽  
Uniaxial Compression ◽  
Uniaxial Compressive Strength ◽  
Stress Level ◽  
Joint Effect ◽  
Crack Evolution ◽  
Evolution Law ◽  
Joint Inclination ◽  
Original Crack

AbstractIn order to explore the fracture mechanism of jointed Phyllite, the TAJW-2000 rock mechanics test system is used to carry out uniaxial compression tests on different joint inclination Phyllites. The influence of joint inclination of Phyllite failure mode is discussed, and the progressive failure process of Phyllite is studied. The test results show that the uniaxial compressive strength anisotropy of jointed Phyllite is remarkable. As the inclination increases, it exhibits a U-shaped change; When 30° ≤ α ≤ 75°, the tensile and shear failures along the joint inclination mainly occurs. the joint inclination controls the failure surface form of the Phyllite; The crack initial stress level of the joint Phyllite is 0.30–0.59σf, the crack failure stress level is 0.44–0.86σf. When α = 90°, the σcd value is the largest, and σcd with α = 90° can be used as the maximum reliable value of uniaxial compressive strength of Phyllite. Using the theory of fracture mechanics, it is analyzed that under uniaxial compression of the rock, the crack does not break along the original crack direction, but extends along the direction at a certain angle to the original crack. The joint effect coefficient is proposed to show the influence of the joint inclination on the uniaxial compressive strength of the phyllite. Both the test and simulation results show that when the joint inclination is 60°, the joint effect coefficient is the largest. The compressive strength is the smallest. Numerical simulation analyses the crack evolution law of phyllite under different joint inclination under uniaxial compression, which verifies that there are different failure modes of joint phyllite under uniaxial compression.

EFFECT OF LOW GAS PRESSURE ON THE PHYSICAL PROPERTIES OF OUTBURST COAL DURING UNIAXIAL COMPRESSION

2021 ◽  
Vol 57 (1) ◽  
pp. 45-56
Author(s):  
Yankun Ma ◽  
Ke Yang ◽  
Deren Chen ◽  
Zhao Aohan
Keyword(s):  
Physical Properties ◽  
Uniaxial Compression ◽  
Gas Pressure

Combined experimental and numerical study of uniaxial compression failure of hardened cement paste at micrometre length scale

2019 ◽  
Vol 126 ◽  
pp. 105925 ◽  
Author(s):  
Hongzhi Zhang ◽  
Yading Xu ◽  
Yidong Gan ◽  
Ze Chang ◽  
Erik Schlangen ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Cement Paste ◽  
Numerical Study ◽  
Hardened Cement ◽  
Length Scale ◽  
Hardened Cement Paste ◽  
Compression Failure
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