On the Mechanism of Stress Superposition Inducing Outburst Under the Influence of Blind Fault Instability

Zhao, Xun; Feng, Tao; Wang, Ping; Wang, Pengfei; Liao, Zhihui; Li, Hongsheng; Zhou, Ze

doi:10.1007/s10706-022-02125-6

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…When the working face advances to the fault, the original stress equilibrium state of the coal-rock mass will be disturbed by mining. As a result, the stress difference between the coal body in the fault zone and the coal body in the working face is formed, which in turn leads to coal and gas outburst. − …”

Section: Introductionmentioning

confidence: 99%

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Study on the Effect of Small Faults on the Gas Content in No. 3 Coal Seam of the Changping Mine Field

et al. 2023

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To study the influence of small faults on the gas content of Coal Seam 3# in the Changping mine field, the influence scope and degree of small faults on Coal Seam 3# and gas content in the Changping mine field are analyzed based on the field measured data such as the gas content on both sides of the fault, the initial speed of gas emission, and the solidity coefficient of the coal seam, combined with the FLAC3D stress simulation results, and the influence area of small faults is zoned from the perspective of gas control. The analysis results show that the measured gas content in the hanging wall of SF250 fault with a drop of 1.3 m and SF353 fault with a drop of 1.9 m is 7.14 and 9.47 m 3 /t, respectively, and the gas content in the footwall is 5.29 and 7.41 m 3 /t, respectively. The gas content in the hanging wall is obviously higher than that in the footwall; the gas content in the coal seam near the small fault surface is slightly lower. With the increase of the distance from the fault surface, the gas content in the coal seam decreases first and then increases; the firmness coefficients of hanging wall coal of small fault are 0.40 and 0.45, respectively, and those of footwall coal are 0.73 and 0.75, respectively. The firmness coefficient of hanging wall coal seam is obviously smaller than that of footwall coal seam. The closer it is to the fault surface, the smaller the firmness coefficient of coal is, and the greater the initial gas release speed is; the permeability coefficient of the coal seam far from the fault surface in the hangingwall of the small fault shows a decreasing trend after an increasing trend. The maximum stress of the coal seam is 21.85 MPa at 14 m from the hangingwall of the fault to the fault, and the minimum stress of the coal seam is 2.79 MPa at 1 m from the footwall of the fault to the fault. The stress of the hangingwall of the fault is greater than that of the footwall of the fault, and the stress concentration area is 14 m from the hangingwall of the fault to the fault.

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Section: Introductionmentioning

confidence: 99%

“…As a result, the stress difference between the coal body in the fault zone and the coal body in the working face is formed, which in turn leads to coal and gas outburst. 13 − 16 …”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Small Faults on the Gas Content in No. 3 Coal Seam of the Changping Mine Field

et al. 2023

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The Influence of Different Sublevel Heights on the Stability of Faults under Sublevel-Filled Synergistic Mining

Li,

Guo,

et al. 2023

Applied Sciences

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At present, when addressing the problem of fault stability in mines, most attention is paid to the study of the impact of a single mining method on faults. In order to study fault stability in mines more comprehensively, this paper researches the effect of coordinated mining using multiple mining methods. For example, the sublevel caving method without the sill pillar and the lower-layer filling method of coordinated mining can be used to analyze the dynamic response law of the fault, as well as the stability of the fault in different mining conditions. In this paper, the stress field, displacement field and sliding trend index of the fault plane and orebody near the fault are obtained via numerical simulation and theoretical analysis methods, and the main factors affecting fault stability under different mining conditions are analyzed. The results show that under the influence of cooperative mining, the shear stress fluctuation of the fault surface and the ore body near the fault increase gradually with the sublevel height of the sublevel caving method without the sill pillar and the lower-layer filling method, and the indexes of slip tendency become larger, which may be a precursor of fault activation. In particular, the fault surface of the sublevel caving method without the sill pillar reflects the drastic change in the shear stress with the larger displacement, and the instability brought to the fault by the sublevel caving method without the sill pillar is greater than that brought to the fault by the lower layer filling method under the premise of only changing the height of the sublevel.

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On the Mechanism of Stress Superposition Inducing Outburst Under the Influence of Blind Fault Instability

Cited by 2 publications

References 6 publications

Study on the Effect of Small Faults on the Gas Content in No. 3 Coal Seam of the Changping Mine Field

Study on the Effect of Small Faults on the Gas Content in No. 3 Coal Seam of the Changping Mine Field

The Influence of Different Sublevel Heights on the Stability of Faults under Sublevel-Filled Synergistic Mining

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