Failure mechanism and control of coal bursts triggered by mining induced seismicity in steeply inclined and extra thick coal seam

Cao, Jinrong; Li, Dou; He, Junguo; Zhu, Guang-an; Wang, Zhengyi; Bai, Jinzheng; Han, Zepeng

doi:10.3389/feart.2022.1042539

Cited by 8 publications

(6 citation statements)

References 48 publications

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“…With the increasing depth of coal resource extraction and the enhancement in the production capacity of individual mines after the integration of mining resources, the number of rock burst mines has gradually increased and the coverage area has also been expanding [1,2]. In this context, rock burst accidents have occurred frequently nationwide and have become one of the most serious coal and rock dynamic disasters in coal mining production.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Prevention of Main Roadway Roof Shock in Strong-Bump Coal Seam with Asymmetric Goaf

Zhao,

Cao,

Zhang

et al. 2024

Applied Sciences

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In response to the increasingly severe situation of main roadway shock in coal seams, with a focus on the strong-bump coal seam in main roadways under an asymmetric goaf in a certain mine, theoretical analysis, numerical simulation, and engineering practices were employed. This study investigated factors influencing main roadway roof shock damage, changes in roof stress, and characteristics of overlying strata movement. This research unveiled the mechanism and prevention of roof shock in main roadways of strong-bump coal seams in an asymmetric goaf. The research results indicate that the influencing factors of main roadway roof shock damage can be divided into two categories: “strata-support” structure strength and surrounding rock stress. For the determination of the “strata-support” structure, in the case of strong bumps in coal seam roadways influenced by the asymmetric goaf, the key factors contributing to shock damage are the side abutment pressure on the coal pillar in the goaf and the activity level of the roof strata. The distribution of roof stress in the main roadway undergoes continuous changes as district faces are sequentially mined. When the goaf area on the west side gradually increases towards the south, the roof stress in the main roadway consistently rises, and the stress increment follows a pattern of initial increase followed by a decrease. The strata structure of the main roadway roof gradually transforms from an “asymmetric T” shape to a “symmetric T” shape in the transverse profile, and with the evolution of the roof rock layer structure, the mutual feedback effect of strata activity on both sides of the roadway gradually strengthens. Affected by the asymmetric goaf, the main roadway in the district undergoes three different stages: one side of subcritical mining influence → both sides of subcritical mining influence → one side of subcritical mining and one side of critical mining influence. In addition, comprehensively considering the impact of various factors in different stages, the theoretical criteria for roof shock failure in the main roadway are determined. The formulation of an optimized position for the main roadway and a scheme for depressurization through deep-hole blasting in the roof reduce the stress level in the surrounding rock of the main roadway, effectively preventing the occurrence of roof shock in the asymmetric goaf of the coal seam main roadway.

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Section: Introductionmentioning

confidence: 99%

Mechanism and Prevention of Main Roadway Roof Shock in Strong-Bump Coal Seam with Asymmetric Goaf

Zhao,

Cao,

Zhang

et al. 2024

Applied Sciences

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“…Rockburst is a phenomenon in coal mining where the coal rock mass suddenly fails, releasing a substantial amount of energy, which can lead to the deformation of the roadway surrounding the rock, equipment damage, and potential disasters such as coal and gas outburst and water inrush [1][2][3][4][5][6][7][8]. The Binchang mining area is one of the major Chinese coal-producing regions, which is generally faced with the situation that the mining depth is large and there is an extra-thick water-bearing sandstone layer above it.…”

Section: Introductionmentioning

confidence: 99%

Layout Pattern of Small Panel and Large Coal Pillar for Rockburst Prevention and Water Control under Extra-Thick Water-Bearing Key Strata

Zhang,

Cao,

Zhao

et al. 2024

Applied Sciences

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There is a very thick water-bearing key strata above the coal seam in the Binchang mining area. When the mining scale is large, it easily breaks and leads to rockburst with a surge of water gushing in the panel. Adopting the layout pattern of a small panel and a large coal pillar can improve the stability of the main key strata, but at present, the research on the layout pattern of a small panel and a large coal pillar under extra-thick water-bearing key strata is still not perfect. Therefore, taking the second and third panels of a mine in Binchang as the engineering background, the width of the coal pillar and the mining scale of the panel are optimized by means of theoretical analysis, field measurement, and numerical simulation to prevent rockburst and control water inflow. The results show: (1) through theoretical calculation, it is deduced that the critical width of instability of the isolated coal pillar in the current mining scale is 257 m, and the critical mining scale of breaking and instability of the main key strata in the third panel is 537 m; (2) considering the bearing capacity of the isolated coal pillar and the recovery rate of coal resources, the reasonable width of the isolated coal pillar is 210~270 m, and when the width is 200 m and 250 m, the reasonable mining scale of the third panel is 490~550 m and 640~700 m, respectively; (3) the field practice shows that the actual width of the coal pillar between the second and third panels is less than the reasonable width, and the stress concentration in the isolated coal pillar area is relatively high, so the roof deep hole blasting and large-diameter drilling in coal seam are adopted to relieve pressure. After taking pressure relief measures, the stress concentration in the isolated coal pillar area is effectively reduced, and the pressure relief effect is remarkable.

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“…They proposed an early warning method for big rock noise events. Cao Jinrong [21] analyzed the horizontal and vertical ejection velocities of the roadway through numerical simulation. Cheng Yunhai [22] studied the ejection phenomenon of the driving face through field monitoring.…”

Section: Introductionmentioning

confidence: 99%

A Study on Disasters Induced by Head-On Ejection in High-Speed Driving under the Influence of Roof Drainage

Cheng

Zhang³

et al. 2023

Sustainability

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During the gob-side entry driving of the Jurassic coal seam in Western China, ejection disasters occur under the influence of roof drainage, which rarely appear in the eastern mining area. To address this problem, a method combining theoretical analysis, numerical simulation, and field monitoring was used to study the disaster induced by head-on ejection during speedy driving under the influence of roof drainage in the context of gob-side entry driving of the 2202 auxiliary haulage roadway in a mine. A calculation model for the critical energy conditions for disasters induced by head-on ejection was established. The relationships between the driving velocity and the dynamic and static loads on the driving face and the disasters induced by ejection were clarified under the influence of roof drainage. The results indicate that the energy threshold for ejection-induced disaster is 12.23 kJ, and the elastic energy of the driving face induced only by static load fails to reach the energy threshold. When the driving velocity exceeds 5 m/d, microseismic activity in front of the driving face increases in a stepwise manner, and the influence of dynamic load intensifies. The superposition of accumulated elastic energy induced by static load and the energy transmitted by microearthquake to the driving face exceeds the energy threshold, resulting in the risk of ejection-induced disaster. Based on this, measures such as microseismic monitoring in front of the driving face, advanced pulverized coal monitoring, driving speed adjustment, and advanced pressure relief of large-diameter boreholes are adopted to ensure safe driving.

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Failure mechanism and control of coal bursts triggered by mining induced seismicity in steeply inclined and extra thick coal seam

Cited by 8 publications

References 48 publications

Mechanism and Prevention of Main Roadway Roof Shock in Strong-Bump Coal Seam with Asymmetric Goaf

Mechanism and Prevention of Main Roadway Roof Shock in Strong-Bump Coal Seam with Asymmetric Goaf

Layout Pattern of Small Panel and Large Coal Pillar for Rockburst Prevention and Water Control under Extra-Thick Water-Bearing Key Strata

A Study on Disasters Induced by Head-On Ejection in High-Speed Driving under the Influence of Roof Drainage

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