The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

Gao, Mingzhong; Zhang, Sheng; Li, Jie; Wang, Haiyun

doi:10.2298/tsci180610122g

Cited by 28 publications

(21 citation statements)

References 8 publications

(11 reference statements)

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“…A gas outburst accident refers to an accident caused by a geological disaster as a result of the formation of a coal seam under the action of ground stress and the gravitational force released by the gas, which causes the weak coal seam to break through the line of resistance and instantly release a large amount of gas and coal. The main reason for this is mining caused by stress concentration, when the load exceeds the strength limit of coal and rock, resulting in shear damage [13]. If the concentration of gas in the air reaches an explosive concentration, an explosion can occur in the presence of an open flame.…”

Section: Introductionmentioning

confidence: 99%

Impact of Gas Control Policy on the Gas Accidents in Coal Mine

Wang

2020

Processes

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Coal mine gas accidents pose a serious threat to the safety of coal mines in China. To prevent such accidents, the Chinese government and relevant agencies have issued a number of related control policies, though the effect of these policies on gas accidents is still lacking. In this study, the relevant data of coal mine gas accidents in China from 2003 to 2018 are sorted and analyzed. The analysis results show that the number of coal mine accidents and deaths has decreased significantly. However, gas accidents account for the highest proportion of deaths and pose the largest threat, compared with other types of accidents. Subsequently, the developmental stages of China’s gas control policies are summarized; they are the independent development stage, the promotion stage and the consolidation stage. A method of calculating the intervention degree of the gas control policies is proposed. The results show that the policy intervention degree is the highest, and the number of accidents is the fastest in the stage of promotion. It is concluded that gas control policies have obvious inhibitory effects on the occurrence of gas accidents, and these policies are fundamental in preventing coal mine gas accidents.

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Section: Introductionmentioning

confidence: 99%

Impact of Gas Control Policy on the Gas Accidents in Coal Mine

Wang

2020

Processes

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“…When it reaches a certain level that can push the coal body forward, the coal and gas outburst will happen. Gao et al [13] used RFPA-GAS software to study the dynamic failure mechanism of coal and gas outburst under the conditions of different support intensity and unsupported conditions and concluded that the outstanding effect of the roadway without support is similar to that in the field, and the coal and gas outbursts are obviously weakened in supported roadways.…”

Section: Of 13mentioning

confidence: 99%

Expansionary Evolution Characteristics of Plastic Zone in Rock and Coal Mass Ahead of Excavation Face and the Mechanism of Coal and Gas Outburst

2020

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Factors leading to coal and gas outbursts are complicated, and the accuracy of predicting outbursts remains difficult to achieve. Therefore, coal and gas outburst risk are still a scientific challenge in the fields of mining, geology, safe engineering, and rock mechanics. Theories explaining and predicting coal and gas outbursts associated with restored strain and gas energy are hot topics. Based on numerical modelling, the evolution of a plastic zone ahead of an excavation face with change of direction and magnitude of regional pre-mining stress field were analyzed. A mechanical analysis model for the expansionary evolution process of the plastic zone ahead of the excavation face was constructed, and the expansionary evolution characteristics of plastic zone ahead of the excavation face were analyzed. The physical and mechanical process and basic conditions for the initiation and development of coal and gas outbursts induced by evolution of plastic zone were discussed. The research provides some new insights into the mechanism, prediction, and prevention of goal and gas outbursts.

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“…e geological conditions of mines with dynamic disasters are generally complex. Gao et al [39], Song and Zhang [40], Jia et al [41], Li et al [42], and Qiu et al [43] have studied the influence of faults, folds, and other geological structures on coal and gas outburst. e former research results show that in the abnormal geological structure, under the disturbance of mining, it can produce greater unbalanced force.…”

Section: Deep Stress-gas Disaster Evolution Processmentioning

confidence: 99%

Research on the Disaster‐Inducing Mechanism of Coal‐Gas Outburst

Nie

Wang

Qiu

2020

Advances in Civil Engineering

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In China, coal-gas outburst is seriously affecting safety of the coal mine. To improve the safety status of underground coal mining, this work investigated the evolution process and occurrence mechanism of coal-gas outburst under the coupling action of stress and gas. Results show that increasing either gas pressure or in-situ stress can make coal destroy and destabilize, and the contribution of gas pressure to coal failure is twice that of in-situ stress. In ultradeep coal mining, coal-gas outburst may occur even under the condition of low gas pressure due to large in-situ stress. Moreover, the larger the mining depth is, the lower the gas index is required for disaster occurrence. The results have certain guiding significance for coal energy mining and the control of coal-gas outburst in deep coal mining.

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The dynamic failure mechanism of coal and gas outbursts and response mechanism of support structure

Cited by 28 publications

References 8 publications

Impact of Gas Control Policy on the Gas Accidents in Coal Mine

Impact of Gas Control Policy on the Gas Accidents in Coal Mine

Expansionary Evolution Characteristics of Plastic Zone in Rock and Coal Mass Ahead of Excavation Face and the Mechanism of Coal and Gas Outburst

Research on the Disaster‐Inducing Mechanism of Coal‐Gas Outburst

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