Study on the Law of Failure Acoustic–Thermal Signal of Weakly Cemented Fractured Rock with Different Dip Angles

Zhang, Wei; Zhang, Baoliang; Zhao, Tianfeng

doi:10.1007/s00603-023-03296-1

Cited by 25 publications

(9 citation statements)

References 30 publications

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“…Each strain component measured in the loading process is processed with the above method to calculate the value of any strain component in the whole loading process. According to the research conclusion in literature, 30,31 during the whole process of rock loading, the area outside the deformation localization zone basically maintains an elastic state. Therefore, the amount of deformation energy density outside the deformation localization band of rock can be obtained by the below formula,  ( )…”

Section: Analysis Methods Of Deformation Energy Evolutionmentioning

confidence: 93%

Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Zhang,

Gong

et al. 2024

Energy Science & Engineering

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The failure of coal mine overburden is mainly caused by fractures under bending loads. The energy evolution characteristics of coal and rock fractures are closely related to coal mine disasters such as rock burst. To obtain the characteristics of energy release and accumulation of coal and rock under bending load, three‐point bending tests of coal, mudstone, and sandstone were carried out respectively. The strength characteristics and fracture propagation process of coal and rock under bending load were studied. The strain energy evolution rules of coal and rock were calculated and obtained. The fracture mechanism of coal and rock was discussed by analyzing the critical strain energy release rate. The results show that the fracture complexity of sandstone and mudstone is greater than that of coal. The microstructure and its directivity in coal and rock indirectly affect their fracture characteristics through the elastic modulus characteristics. The distribution of parameters such as peak load of fracture, fracture energy, and crack length of coal and mudstone samples is discrete, while that of sandstone samples is concentrated. The deformation energy density of coal and rock basically shows a linear increase trend at the prepeak stage. The deformation energy density evolution characteristics at the postpeak stage are mainly affected by the load drop. It is important to establish the internal relationship between the meso structural characteristics and macro mechanical properties for solving engineering problems.

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Section: Analysis Methods Of Deformation Energy Evolutionmentioning

confidence: 93%

Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Zhang,

Gong

et al. 2024

Energy Science & Engineering

Self Cite

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“…At present, scholars at home and abroad have systematically studied the infuence of crack dip angle, number and length on the strength, and deformation and failure characteristics of coal mass through laboratory tests and numerical simulation [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles

Zhang,

Han,

Chen

et al. 2024

Shock and Vibration

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In order to study the influence of fissures on the burst tendency of coal, the test and numerical simulation of the burst tendency of coal with different burst angles were carried out. The evolution law of the burst tendency index of coal under the influence of burst angle was analyzed, and the mechanism of energy storage and release of coal under the influence of fissure angle was revealed. The results show that compared with the specimens without prefabricated cracks, the uniaxial compressive strength of the specimens with 0° cracks is reduced by 48.4%, the dynamic failure time is increased by 279.4%, the burst energy index is reduced by 54%, and the burst energy velocity index is reduced by 87.9%. After that, with the increase of prefabricated crack angle, the uniaxial compressive strength of coal increases gradually, the dynamic failure time decreases gradually, the burst energy index increases gradually, and the burst energy velocity index increases gradually. That is to say, the larger the crack angle contained in the coal body, the stronger the burst tendency of the coal body, but it is still lower than that of the complete coal body. With the increase of prefabricated crack angle, the proportion of prepeak elastic energy of coal body increases, the less energy dissipation in the whole loading process of coal body, and the faster energy release rate during failure. The research results can provide some theoretical support for the prevention and control of rock burst disaster.

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“…The prediction of the WCF height is traditionally based on empirical formulas derived from single-slice mining conditions, where the mining height is less than 3 m and the total slice mining height is limited to within 15 m [28]. Moreover, related research has indicated that the excavation speed has a great influence on the damage of the overburden rock layers, so the possibility of rock layer disasters should be considered when conducting underground mining activities [29,30].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Water-Conducting Fracture in Weakly Cemented Strata in Response to Mining Activity: Insights from Experimental Investigation and Numerical Simulation

Liu,

Zhou,

et al. 2023

Water

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The accurate prediction of the vertical extent of water-conducting fracture (WCF) zones in weakly cemented strata is particularly significant in preventing and controlling water hazards in western coal mines. The evolution of fractures in weakly cemented strata affected by mining disturbances was comprehensively analyzed by physical similarity models, numerical simulations, and field investigations. Results indicated that the development progress of water-conducting fractures can be divided into three phases: initial slow generation, subsequent rapid development, and eventual stabilization. The numerical simulation results revealed that in the initial stage of working face mining, the development of the plastic zone is limited, and there is minimal failure in the overlying strata; therefore, fractures are slowly produced without penetrating through the strata. When the plastic zone fully encompasses the entire main roof, it triggers severe shear failure in the overlying strata, resulting in rapid fracture propagation and penetration. Once the fracture height reaches a stable state, there is no further increase in the maximum vertical displacement of key strata, indicating the extensive collapse and compaction of the overburden as well as the stabilization of the fracture heights. A modified prediction equation for WCF in weakly cemented strata was obtained by correcting the traditional empirical formula based on field investigations. This modified prediction equation enhances the accuracy in predicting fracture heights and provides a theoretical reference to address the issue of the inaccurate prediction of the water-conducting fracture height in western mine rock strata.

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Study on the Law of Failure Acoustic–Thermal Signal of Weakly Cemented Fractured Rock with Different Dip Angles

Cited by 25 publications

References 30 publications

Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles

Evolution of Water-Conducting Fracture in Weakly Cemented Strata in Response to Mining Activity: Insights from Experimental Investigation and Numerical Simulation

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