Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process

Zhao, Jun; Chen, Juntao; Xing, Huilin; Zhao, Zhihao; Zhuang, Xinguo

doi:10.1007/s00024-021-02905-w

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…In article [10], the authors studied the fault activation mechanism by a boundary element method numerical modeling and found that both horizontal stress and vertical stress had an effect on the fault. Article [11] adopted the extended finite element numerical simulation software to study the stress evolution and deformation failure rules of a coal seam containing a fault floor and found that, when the mining coal seam was close to the fault, the fault zone rotated and deformed. The authors of article [12] conducted a numerical study on groundwater outburst along the fault zones in coal mines, and divided the floor strata into three zones: a mining-induced fracture zone, an intact zone and a fault activation zone, and found that the intact zone was the key element to resisting groundwater outburst.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Coal Floor Fault Activation Inducing Water Inrush Using Microseismic Monitoring—A Case Study in Zhaogu No. 1 Coal Mine of Henan Province, China

Xin

Jiang

Zhai³

et al. 2023

Sustainability

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Previously conducted studies have established that mining activities can activate faults, which will cause floor water inrush disasters and cause loss of personnel and property. In order to reduce the possibility of water inrush disasters in mining, it is particularly important to study the dynamic characteristics and rules of floor fault activation under the influence of mining. In this work, firstly, a microseismic monitoring system was established in the working face to analyze the changes of microseismic indexes before and after grouting. It was found that grouting can enhance the strength of a rock mass and play a role in sealing the water channel. Secondly, the quadratic kernel function of microseismic event energy was established. It was found that the accumulation degree of microseismic events and the region of high energy kernel density increased with the decrease of the distance between the working face and the left boundary of the “analysis region”. Combined with a microseismic event index and water inflow, the activation process of the floor fault was divided into five stages. Finally, the plastic failure region of surrounding rock under different excavation steps was analyzed by numerical simulation, and the characteristics of fault activation were further explained. A method of taking measures to prevent water inrush in the “sign stage of fault activation” was proposed.

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Section: Introductionmentioning

confidence: 99%

Analysis of Coal Floor Fault Activation Inducing Water Inrush Using Microseismic Monitoring—A Case Study in Zhaogu No. 1 Coal Mine of Henan Province, China

Xin

Jiang

Zhai³

et al. 2023

Sustainability

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“…There are many important energy sources on earth, such as geothermal energy and natural gas. , Coal, as an important part of primary energy, , plays an important role in world energy security. , The fully mechanized top coal caving technology has obvious advantages in medium and thick coal seams . However, the precise control of the coal caving mechanism is the key to achieving high yield and high efficiency of the fully mechanized top coal caving technology .…”

Section: Introductionmentioning

confidence: 99%

Vibration Response Analysis of the Tail Beam of Hydraulic Support Impacted by Coal Gangue Particles with Different Shapes

et al. 2022

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The existing research on coal gangue identification based on vibration usually assumes that coal gangue particles are ideal shapes. To understand the vibration response difference in hydraulic support caused by coal and gangue with real shapes, this paper uses a three-dimensional (3D) scanning technology to determine the real shape of coal particles. The process of coal and gangue impacting the tail beam at different angles was simulated in the LS-DYNA software package, and the effects of shape parameters, velocity, and coal strength on the difference in vibration signals caused by the two were analyzed statistically. The conclusions are as follows: the vibrational response of the tail beam is concentrated mainly in the area between the ribs. The regularity of the velocity signal caused by gangue is better than the regularity of the velocity signal caused by coal, and the attenuation speed of the acceleration signal of gangue is slower than the attenuation speed of the acceleration signal of coal. The probability distributions of the velocity and acceleration responses were analyzed statistically, and the results show that the results from coal can be well fitted by a logarithmic normal function, and the standard deviations of velocity and acceleration are 0.05591 and 489.8, respectively. The gangue results are fitted by the gamma function and the Weibull function, and the standard deviations are 0.13531 and 737.9, respectively, showing that the fitting function has the potential to be used as the basis for coal gangue identification. The change in coal strength has little effect on the vibration response of the tail beam. With increasingly falling velocity, the vibration signal intensity of the tail beam increases, but the discrimination between coal and gangue weakens; therefore, measures should be taken to reduce the falling velocity of the rock mass. The research results of this paper can provide a reference for further study of coal gangue identification methods based on vibration.

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Dynamic Instability Mechanism and Stress Staged Evolution of Gob‐Side Entry During Cross‐Fault Mining for Thick Coal Seam

Liu,

Gao,

Shi

et al. 2024

Energy Science & Engineering

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During cross‐fault mining, the stress concentration in the surrounding rock of thick coal seam gob‐side entry was prone to dynamic disasters. Based on the in‐site geological conditions of the No. 6305 coal face of the Xinjulong coal mine, a FLAC3D numerical simulation model was established to research the failure and stress staged evolution of coal pillar in the gob‐side entry during cross‐fault mining. By analyzing the relation of surrounding rock structure, the mechanical models of different stages during cross‐fault mining were established. Furthermore, the mechanical mechanism of coal pillars' dynamic instability under the influence of fault activation was revealed, and the mechanical criterion n was given. The control technology of ‘asymmetric strengthening support + roof cutting and pressure relief’ was proposed and designed. Field practice showed that the maximum roof‐to‐floor and two‐side displacements of the gob‐side entry are 249.3 mm and 150.4 mm, and the force of anchor cable is 184.2 kN. This research provided theoretical guidance and reference for the stability control of roadways within the influence range of fault under deep mining conditions.

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Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process

Cited by 8 publications

References 25 publications

Analysis of Coal Floor Fault Activation Inducing Water Inrush Using Microseismic Monitoring—A Case Study in Zhaogu No. 1 Coal Mine of Henan Province, China

Analysis of Coal Floor Fault Activation Inducing Water Inrush Using Microseismic Monitoring—A Case Study in Zhaogu No. 1 Coal Mine of Henan Province, China

Vibration Response Analysis of the Tail Beam of Hydraulic Support Impacted by Coal Gangue Particles with Different Shapes

Dynamic Instability Mechanism and Stress Staged Evolution of Gob‐Side Entry During Cross‐Fault Mining for Thick Coal Seam

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