Statistical damage model for dry and saturated rock under uniaxial loading based on infrared radiation for possible stress prediction

Cao, Kewang; Ma, Liqiang; Yu, Wu; Spearing, A.J.S.; Khan, Naseer Muhammad; Hussain, Sajjad; Rehman, Faheem Ur

doi:10.1016/j.engfracmech.2021.108134

“…Different scholars have investigated strain energy and acoustic emission properties under loading. [27,61,62] To obtain the stress-strain interface, the scholars used the traditional stress-strain constitutive models under loading [63][64][65]. The damage constitutive model for coal under loading using AE has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

Analytical Damage Model for Predicting Coal Failure Stresses by Utilizing Acoustic Emission

Ali

¹

,

Wang

²

,

Li

³

et al. 2023

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Overburden collapse and water inrush in mines are primarily caused by rock fractures. Mining safety can be enhanced by monitoring and identifying early signs of coal failure in the mines. This article collected acoustic emission data synchronously throughout a series of uniaxial compression (UC) experiments on natural and water-saturated coal. The influence mechanisms of water, mechanical properties, and acoustic emission signals on the stress–strain curve and the SEM results of water-saturated and dry samples are investigated. As a result, the mechanical properties of coal are not only weakened by water saturation, such as elastic modulus, strain, stress, and compressive strength but also reduced acoustic emissions. In comparison with saturated coal, natural coal has a uniaxial stress of 13.55 MPa and an elastic modulus of 1.245 GPa, while saturated coal has a stress of 8.21 MPa and an elastic modulus of 0.813 GPa. Intergranular fractures are more likely to occur in coal with a high water content, whereas transgranular fractures are less likely to occur in coal with a high water content. An innovative and unique statistical model of coal damage under uniaxial loading has been developed by analyzing the acoustic emission data. Since this technique takes into account the compaction stage, models based on this technique were found to be superior to those based on lognormal or Weibull distributions. A correlation coefficient of greater than 0.956 exists between the piecewise constitutive model and the experimental curve. Statistical damage constitutive models for coal are compatible with this model. Additionally, the model can precisely forecast the stress associated with both natural and saturated coal and can be useful in the prevention of rock-coal disasters in water conditions.

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“…However, the gas reservoirs in the central Sichuan paleouplift have strong reservoir heterogeneity, complex pressure system and oil and gas migration laws, and other geological characteristics, which are not conducive to determining the production scale of the gas reservoirs in the future. Among the numerous factors that affect the natural gas production, the most important one is the permeability of the rock stratum [6][7][8]. Some scholars have studied this problem, established a flow model of shale gas in the fractal double porosity, and verified the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Prediction Model and Risk Quantification of Natural Gas Peak Production in Central Sichuan Paleo-Uplift Gas Reservoirs

Li¹,

Yu²,

Li

³

et al. 2023

Geofluids

1

0

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Located in the Sichuan Basin of China, the central Sichuan paleo-uplift is a geological structure that spanned several areas in Sichuan province and was formed 500 million years ago. It is the bottom layer with rich conventional natural gas resources of more than 3 × 10 12 m 3 , and the proven reserves are about 30%, while the recovery rate is only 1.4%. In this paper, the Hubbert and Gauss models are used to study the peak production of natural gas. The Monte Carlo simulation method is used to predict the realization probability of future medium and long-term production, evaluate the risk level of natural gas production, and realize the whole process research from scale prediction to risk quantification of gas reservoirs. According to the Gauss model, under the realization probability of P50, the gas reservoir in the central Sichuan paleo-uplift can reach a peak production value of 145 × 10 8 m 3 / a , in 2040, and maintain a stable production state in 2034-2046. The risk grade evaluation matrix, through which the dispersion degree C ∈ (5% and 10%) in the rising stage and rapid production decline stage can be obtained, and the dispersion degree C ∈ (10% and 25%) in the stable production stage and slow production decline stage can be obtained. The dispersion degree and realization probability can be integrated to obtain the risk level at different stages.

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“…Many scholars [1][2][3][4][5][6][7] have studied the change in infrared radiation information in the process of stress on rocks and confirmed that rocks will have obvious infrared radiation changes in the process of force deformation. Studies have shown that the use of infrared thermal imaging technology for infrared detection during the stress process of rock masses, especially before rupture instability, to find the precursor information of its associated infrared radiation and predict the stability of rock masses, is a promising new method [8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Research on the Characteristics of Infrared Radiation and Energy Evolution Law of Red Sandstone with Different Porosity during Uniaxial Compression

Lin

¹

,

Zheng

²

,

Zhou

³

et al. 2022

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Infrared radiation thermal imaging technology is proposed for rock mechanics tests. Through the infrared radiation temperature and stress–strain curves of sandstone with different porosity during the process of uniaxial compression loading obtained by an infrared camera and uniaxial compression testing machine, the characteristics of infrared radiation on sandstone are systematically analyzed during uniaxial compression loading. The results show that: (1) The strength of sandstone decreases with the increase of porosity, the infrared thermography of sandstone has obvious characteristics of stage evolution and is closely related to the deformation and failure stage of rock in the process of uniaxial compression; (2) During the rock failure process, infrared thermography is differentiated, and the high-temperature radiation zone can reflect the location, size and shape of rock fractures; (3) During the uniaxial compression loading process, the evolution law of the average infrared radiation temperature (AIRT) is closely related to the porosity and uniaxial compressive of the rock, and it is possible to invert all processes of rock failure. The research results demonstrate that the technique of infrared thermal imaging can be applied to rock mechanics tests, and the evolution law of the infrared radiation characteristics can provide a reference for stability analysis of the underground rock engineering.

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Statistical damage model for dry and saturated rock under uniaxial loading based on infrared radiation for possible stress prediction

Cited by 29 publications

References 38 publications

Analytical Damage Model for Predicting Coal Failure Stresses by Utilizing Acoustic Emission

Analytical Damage Model for Predicting Coal Failure Stresses by Utilizing Acoustic Emission

Prediction Model and Risk Quantification of Natural Gas Peak Production in Central Sichuan Paleo-Uplift Gas Reservoirs

Research on the Characteristics of Infrared Radiation and Energy Evolution Law of Red Sandstone with Different Porosity during Uniaxial Compression

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