Influence of High-Temperature Treatment on Strength and Failure Behaviors of a Quartz-Rich Sandstone under True Triaxial Condition

Li, Xiaoshuang; Peng, Jun; Xie, Yulin; Li, Qihang; Zhou, Tao; Wang, Jiawen; Zheng, Wenbo

doi:10.2113/2022/3086647

Cited by 32 publications

(18 citation statements)

References 30 publications

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“…By studying the failure pattern of rocks under different high temperatures it can be found that the failure was transformed from brittleness to ductile brittleness, and the failure degree intensified with the increase of temperature. Li et al 34 – 36 explored the fragmentation characteristics of the coal–rock-like combined body under impact load and concluded that the combinations mostly showed splitting failure, and the failure surface was relatively flat. Some studies 37 – 40 have found that the coal body was damaged first when the coal–rock combined body was destroyed under compressive load, and the expansion of cracks might lead to the failure of the rock body.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and acoustic emission characteristics of deep hard coal after segmented high-temperature treatment

Chun

Cheng

et al. 2023

Sci Rep

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Based on engineering background that local heating of coal seam is uneven due to underground coal gasification, coal-bed gas exploitation via heat injection, spontaneous combustion of coal seam, etc., segmented heating coal sample was used to simulate coal seam under uneven heating condition, and experimental study on mechanical behaviors of coal sample after segmented heat treatment at high temperatures was conducted. Test results show that temperature at 100 °C ~ 400 °C did not reach ignition temperature of deep hard coal for the experiment and was not enough to change main ingredients of coal sample, which less affected compression strength, elastic modulus, acoustic emission behavior of coal sample. Although compaction stage-elastic stage-plastic stage-broken stage appeared in compression stress–strain curve of coal sample, height increase led to decrease of compression strength, elastic modulus of coal sample, cumulative amplitude and ringing count for acoustic emission in the form of power function. Meanwhile, it is found that final failure modes of coal sample after segmented heat were mainly shear failure and separation failure and friction mixed failure was secondary. In addition, influence of heating temperature at 100 °C ~ 400 °C on failure modes of coal sample was small. However, height increase in the heating section of coal sample made shear failure surface gradually move to the heating section and separation failure surface moved with the change of contact surface position between heating section and non-heating section. Furthermore, the integral failure degree of coal sample was more serious. Finally, based on variation behaviors of acoustic emission parameter for coal sample after segmented heating, inversion formula on acoustic emission parameter for strength of coal sample was discussed and verified via experimental result of coal sample with different segmented heat height after heating treatment at 200 °C.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and acoustic emission characteristics of deep hard coal after segmented high-temperature treatment

Chun

Cheng

et al. 2023

Sci Rep

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“…As the slag particles have a certain cohesion compared with ordinary rocks, the difference in material characteristics affects the mechanical properties of TSM. Most of the physical and mechanical properties of the SRM have been studied in three ways: laboratory testing, numerical simulation, and theoretical analysis (Chen et al, 2021;Li et al, 2022). Xing et al (2020) used particle flow software to simulate the triaxial test numerically and elucidated the micro-mechanism of SRM with different rock content.…”

Section: Introductionmentioning

confidence: 99%

Multiscale mechanical characterizations of ultrafine tailings mixed with incineration slag

Jing

Jia³

et al. 2023

Front. Earth Sci.

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Adding a type of municipal solid waste (incinerator slag) into ultrafine tailings can effectively enhance the mechanical properties of tailings. With an aim to study the macro- and micro-mechanical properties of the tailings slag mixture (TSM), the strength parameters (internal friction angle, cohesion) and micro-mechanical properties with different slag contents were analyzed by geotechnical experiments and particle flow simulations, respectively. The macroscale experimental results demonstrated that the strength parameters of TSM were much higher than that of tailings. Strength parameters also showed non-linear-rising trends with increasing slag content. For the slag content of 40%, the maximum cohesiveness of TSM was determined at 65.2 kPa, and the corresponding friction angle was 39.9°C. Furthermore, the Particle Flow Code (PFC) micro-simulation software was used to analyze the micro-mechanical characteristics of the TSM at different slag contents. The microscale simulation outcomes indicated that the particle transport, particularly in their moving directions, became increasingly chaotic with an increase in the slag content; also, the slag particles significantly impacted the shear processing zone of the TSM. These experimental and numerical results brought more scientific insights into the shear failure mechanism of TSM.

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“…Some scholars determined the shear behaviors of structural planes by using numerical simulations. Based on the characteristics of discontinuity, heterogeneity and anisotropy of rock structure [ 21 , 22 , 23 ], it is most suitable to choose particle follow code method (PFC) to conduct numerical simulations [ 24 , 25 ]. PFC can conduct research on the mechanical characteristics of a rock structure from the micro level and simulate the mechanical behavior of rock in different working situations, which can provide a supplement to and comparison with laboratory testing [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Microcrack Propagation Characteristics and Influencing Factors of Serrated Structural Plane

et al. 2022

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The serrated structural plane is the basic unit of structural plane morphology. However, the understanding of its internal stress distribution, failure mode and crack evolution law was not clear enough in previous studies. In this paper, the shear mechanical properties of the serrated structural planes were studied by numerical simulation, and the crack evolution law of the serrated structural planes and the effects of four microscopic parameters on the shear properties were analyzed. The results show that: (1) the number of microcracks increases with the increase in normal stress; the crack expansion rate is slow before the shear stress reaches the peak. After the shear stress reaches the peak, the crack expansion rate continues to increase, and the microcracks keep sprouting and expanding, and the number of microcracks tends to stabilize when the shear stress reaches the residual shear strength. (2) The particle contact stiffness ratio kn*/ks* and parallel bond stiffness ratio kn/ks were negatively correlated with the shear strength; and the particle contact modulus E and parallel bond modulus E* were positively correlated with the shear strength. As the particle contact modulus E and parallel bond modulus E* increase, the peak shear displacement gradually decreases. The parallel bond stiffness ratio kn/ks has a negative correlation with the peak shear displacement. This study is expected to provide theoretical guidance for the microscopic parameter calibration and shear mechanical analysis of serrated structural planes. (3) Several XGBoost, WOA-XGBoost, and PSO-XGBoost algorithms are introduced to construct the quantitative prediction model, and the comparative analysis found that WOA-XGBoost has the best fitting effect and can be used for the prediction of shear strength. When using this model to calculate the weight shares of micro-parameters, it was found that kn*/ks* has the greatest influence on shear strength, followed by E*; E and kn/ks had the least influence.

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Influence of High-Temperature Treatment on Strength and Failure Behaviors of a Quartz-Rich Sandstone under True Triaxial Condition

Cited by 32 publications

References 30 publications

Mechanical properties and acoustic emission characteristics of deep hard coal after segmented high-temperature treatment

Mechanical properties and acoustic emission characteristics of deep hard coal after segmented high-temperature treatment

Multiscale mechanical characterizations of ultrafine tailings mixed with incineration slag

Numerical Analysis of Microcrack Propagation Characteristics and Influencing Factors of Serrated Structural Plane

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