Gray Characteristics Analysis of Strain Field of Coal and Rock Bodies Around Boreholes During Progressive Damage Based on Digital Image

Ji, Xiang; Zhang, Tianjun; Ji, Bing; Zhang, Lei; Pang, Mingkun; Pan, Hongyu; Ji, Bingnan

doi:10.1007/s00603-023-03351-x

Cited by 18 publications

(2 citation statements)

References 57 publications

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“…Luo et al [17] studied the deformation behavior of soft and hard interbedded rock using DIC, and studied the deformation and failure characteristics of horizontal soft and hard interbedded rock samples under uniaxial compression. Ji et al [18] used the DIC experimental platform of coal rock deformation damage to carry out the surface deformation observation test of coal rock around the borehole during the progressive damage process. Yang et al [19] studied the multi-dimensional non-uniform deformation and failure characteristics of siltstone through linear differential transformer (LVDT), DIC, computational tomography (CT), acoustic emission (AE), and ultrasonic velocity.…”

Section: Introductionmentioning

confidence: 99%

DIC-Based Hydration Absorption Detection and Displacement Field Evolution of Outcrop Porous Sandstone

Hao,

Wang,

Zhao

et al. 2024

Applied Sciences

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In order to study the hydration absorption behaviors and characteristics of sandstone in Mogao Grottoes in China, the pressure-less hydration absorption experiment on the outcrop porous sandstone of Mogao Grottoes was carried out by using the self-developed real-time monitoring experimental system. The hydration absorption was measured and the curve of hydration absorption with time was drawn. At the same time, the digital image correlation method (DIC) was used to measure the full-field deformation, and the speckle pattern of the sample was analyzed using Match ID, and the displacement field and strain field of the sandstone sample at different hydration absorption moments were computed. Moreover, the sparse area and dense area of sandstone are used as regions of interest (ROI) for DIC analysis. According to the test results, it is concluded that the hydration absorption of sandstone increases rapidly in the initial stage, and gradually tends to be stable with the change of time. This corresponds well with the deformation characteristics of sandstone analyzed using DIC. In the initial stage, the deformation of sandstone increases rapidly. With the change in time, the deformation of sandstone samples gradually slows down. When the hydration adsorption reaches saturation, the sandstone continues to deform for a period of time before stopping hydration absorption. The results of the mercury injection test and the XRD test show that the porosity of the sparse area is larger than that of the dense area and the particle content of the dense area is lower. When the sandstone is saturated with water, the liquid is immersed in the pores between the solid particles, which makes the sparse area more prone to stress concentration, and the deformation in the sparse area is larger. Therefore, when analyzing the hydration absorption deformation of sandstone, the porosity should be considered.

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Section: Introductionmentioning

confidence: 99%

DIC-Based Hydration Absorption Detection and Displacement Field Evolution of Outcrop Porous Sandstone

Hao,

Wang,

Zhao

et al. 2024

Applied Sciences

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“…In recent years, China’s gas extraction and utilization technology has made progress, but there is still unbalanced extraction, and the overall low extraction concentration and extraction rate [ 3 , 4 ]. The reason is not only the poor permeability of coal seam [ 5 ], but also that under the influence of some factors such as permeability enhancement, tunneling and mining. The special structure of the borehole leads to the failure of coal around the borehole [ 6 ], resulting in a large number of crack networks, forming air leakage channels and seriously reducing the concentration of gas extraction [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Zhang

et al. 2023

PLoS ONE

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The ultrasonic characteristics of the coal and rock bodies around boreholes during failure are closely related to the crack propagation law. To investigate the ultrasonic characteristics and crack propagation law of coal and rock bodies around boreholes, different grouting samples with boreholes were taken to carry out ultrasonic test during progressive failure. The ultrasonic amplitude, velocity and attenuation coefficient of the samples were analyzed. According to the ultrasonic time difference formula, the equivalent crack width of the sample during the failure process is calculated. The influence of grouting material on the crack propagation law is quantitatively analyzed. The results show that: (1) The peak stress, elastic energy at the peak, ultrasonic parameters and crack propagation of the coal and rock bodies around boreholes show obvious differences influenced by the strength of the grouting material. (2) During the loading process, the arrival time of the first wave of the sample with holes is 5μs later than that of the grouting sample, and the ultrasonic energy attenuates fastest in the time domain, and the coda wave is not developed. (3) During the progressive failure, the ultrasonic velocity and attenuation coefficient of all show three stages of stability(0~0.6σp), slow change(0.6σp~0.8σp) and rapid change(0.8σp~1.0σp). According to the "sudden decrease" of velocity and the "sudden increase" of attenuation coefficient to judge the crack propagation of sample. (4) The equivalent crack width of the sample increases exponentially with the increase of stress level. At the time of reaching the peak stress, the equivalent crack width of SH-BH increases about 0.027mm~0.032mm, SH-PU about 0.01mm~0.014mm, and SH-CEM about 0.002mm~0.006mm.

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Study on progressive damage and deformation law of coal body around borehole under different moisture states

Zhang,

Zhang

2024

Environ Earth Sci

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Gray Characteristics Analysis of Strain Field of Coal and Rock Bodies Around Boreholes During Progressive Damage Based on Digital Image

Cited by 18 publications

References 57 publications

DIC-Based Hydration Absorption Detection and Displacement Field Evolution of Outcrop Porous Sandstone

DIC-Based Hydration Absorption Detection and Displacement Field Evolution of Outcrop Porous Sandstone

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Study on progressive damage and deformation law of coal body around borehole under different moisture states

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