Rock burst risk in an island longwall coal face by stress field

Liu, Guangjian; Chen, Jianjun; Yang, Jianguo; Cao, Jinglong

doi:10.1007/s12303-017-0074-9

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…Considering that panel 10304 is fully mechanized for caving mining in thick coal seams and that the working face is an island working face, the mining stress is concentrated and the influence range is wide [34,35]. The strain test range is designed to be 230 m, of which the advanced range is 150 m. The lagging range is 80 m, and…”

Section: Observation Methodsmentioning

confidence: 99%

Comprehensive Measurement of the Deformation and Failure of Floor Rocks: A Case Study of the Xinglongzhuang Coal Mine

et al. 2020

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The isolated island panel 10304 of the Xinglongzhuang coal mine was used as the research subject to study the deformation and damage characteristics of the coal seam floor. The damage of the floor was studied using the borehole strain sensing method and borehole imaging technology, and FLAC3D was used to study the influence of abutment pressure on floor failure. The result shows that the floor under the superimposed area which is affected by lateral and advanced abutment pressure is damaged firstly, and the maximum depth reaches 26 m, other areas of the working face about 23 m. The degree of deformation and failure of floor rock at different depths is decreased. The deformation damage increases with the advancement of the working face until a certain distance at the same depth. The hole image can clearly show the influence range of the abutment pressure in front of the coal wall and influence the degree of the advancement and lag by means of the strain increment curve for each sensor probe and the images from different drilled positions. On the basis that the results of simulation and field measurement are consistent, the results can reflect the three-dimensional failure characteristics of the whole island working face floor in the process of coal mining more comprehensively and accurately; moreover, they also can provide important information for mine flood prevention and ecological environment protection.

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Section: Observation Methodsmentioning

confidence: 99%

Comprehensive Measurement of the Deformation and Failure of Floor Rocks: A Case Study of the Xinglongzhuang Coal Mine

et al. 2020

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“…Based on the load transfer mechanism, Zhu et al derived a series of formulas for the average static stress and dynamic stress of island coal pillars through theoretical analysis [26]. Liu et al obtained some reasonable early warning parameters through the stress field distribution law of island working faces [27]. Xu et al investigated the stress distribution, deforestation features, and plastic zone distribution features of the roadway and coal pillar in an island working face during mining with the use of numerical modeling [28].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Distribution Characteristics of High Static Load in the Island Working Face of Extra-Thick Coal Seams with Hard Roof: Addressing the Challenge of Rock Burst Risk

Dai,

Gao,

Gao

et al. 2024

Applied Sciences

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A high static load state significantly increases the risk of rock burst occurrences on the island working face, posing a significant threat to the safety of coal mine production. This paper focused on the engineering background of the 8204-2 working face at Tashan Coal Mine. Field research indicated that there were noticeable differences in the frequency of coal bursts in different regions and working face ranges, with the mine pressure being complex and severe. Through theory analysis, the stress concentration degree of the island working face was mainly affected by the buried depth, working face length, gob length, coal seam thickness, and coal pillar width. The stress distribution and plastic zone changes of the island working face, influenced by different factors, were studied by numerical simulation. The entity coal stress equation of the island working face was fitted and the mechanism of rock burst in the island working face was revealed. The research findings presented in this paper provide important theoretical support and technical guidance for the safe and efficient mining of island working faces.

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“…Wang et al [23] and Deng and Gu [24] analyzed the mechanism of mine seismic and rockburst triggered by isolated coal pillars using mechanical models, studied the overlying strata movement law of isolated coal pillars, and proposed reasonable width design criteria for isolated coal pillars. Liu et al [25] explored the distribution of stress field on the isolated longwall working face by mechanical model, theoretical calculations, seismic computed tomography, and energy density, studied the stress distribution characteristics on the isolated longwall working face under three different surrounding rock conditions, and evaluated the rockburst risk of four longwall isolated working faces in ZhaoLou coal mine as an example. Xue et al [26] revealed the mechanism of rockburst occurring in mine coal pillars from the perspective of energy evolution and the bursting liability of coal specimen through theoretical calculations and numerical simulations, proposed the energy density criteria for rockburst hazard evaluation, and analyzed the energy density factor and the characteristics of the changing trend in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

Sun

Zhu

Jiang

et al. 2022

Mathematical Problems in Engineering

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The isolated working face has always been the hardest hit area for the occurrence of rockburst, and the spatially isolated working face with multiple coal seams is often easily overlooked due to its hidden nature, which leads to the occurrence of rockburst accidents. This paper takes the Liuhuanggou coal mine (9–15) 08 isolated working face as the engineering background, used field research, theoretical analysis, numerical simulation, and field monitoring, investigated the coal body stress evolution law during mining, and revealed the overall instability rockburst mechanism of the working face and deduced the limit advance distance when the working face was in a state of boundary instability. The research results show the following: (1) with the increase of advancement, the overlying strata on the working face are dynamically transformed from the “C” spatial structure with hollowing on both sides to the “θ” spatial structure with coal body support in the middle; (2) when the dynamic load stress on the coal body of the working face exceeds 1.5 times its integrated compressive strength, there is a risk of overall instability rockburst; (3) when the working face advances to 430 m from the open cutting, the superimposed stress on the coal body exceeds its comprehensive compressive strength and reaches a critical instability state, which is verified by numerical simulation. Based on the analysis of the mechanics and mechanism of the overall instability rockburst of the working face, this paper proposes a set of targeted safe mining solutions: (1) The joint monitoring system of microseism-stress-drilling cutting is adopted to monitor and warn the dangerous rockburst areas. (2) The “rockburst-gas” drilling technique is used to unload the pressure on both sides of the working face and the coal wall. (3) The mining speed shall not exceed 3.2 m/d when the working face is mined before 350 m, and shall not exceed 2.4 m/d when the working face enters the influence area of mined-out LW(4-5)02 (350∼550 m). The microseismic monitoring results and field practice confirmed the reasonableness and effectiveness of the safe mining technology plan.

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Rock burst risk in an island longwall coal face by stress field

Cited by 18 publications

References 20 publications

Comprehensive Measurement of the Deformation and Failure of Floor Rocks: A Case Study of the Xinglongzhuang Coal Mine

Comprehensive Measurement of the Deformation and Failure of Floor Rocks: A Case Study of the Xinglongzhuang Coal Mine

Exploring the Distribution Characteristics of High Static Load in the Island Working Face of Extra-Thick Coal Seams with Hard Roof: Addressing the Challenge of Rock Burst Risk

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

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