Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo, Haijun; Li, Xianzhang; Cui, Hao; Chen, Kaixuan; Zhang, Yuanyuan

doi:10.1002/ese3.541

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…Wang et al 3 analyzed the roof breaking mechanism of the coal lane fault area from the perspective of mechanics, and gave the countermeasures to prevent the coal mine roof accidents from the perspective of support. Guo et al 4 applied the field measurement and numerical simulation methods to systematically study the roof motion characteristics of the deep topsoil integrated stope, and put forward the advanced stress dynamic monitoring technology to predict the stope pressure.…”

Section: Literature Reviewmentioning

confidence: 99%

A new fusion method to predict coal mine roof accidents

Liu

et al. 2023

Quality & Reliability Eng

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In the context that coal remains the main energy source of China now, the safety of coal mine production is still worth our attention. For the factors influencing the roof accident of coal mine roadway have great complexity and uncertainty, a new risk prediction method of coal mine roof accidents integrating T‐S fuzzy fault tree and Bayesian network (BN) is proposed. The constructed method determines the BN and the conditional probability tables according to the established T‐S fuzzy fault tree. The fault state and fuzzy fault rate of root nodes are described according to the fuzzy number. And the forward inference of Bayesian is used to calculate the probability of the accidents on the roadway roof based on the fault probability of the root nodes and actual fault probability during construction respectively, to realize the risk prediction of roof accidents. Finally, practical data are used to verify the new fusion risk evaluation method by taking two mines as cases. The results show that the influencing factors calculated by the new fusion risk prediction method are completely consistent with the actual situation, confirming the effectiveness and reliability of this method, which providing new ideas for the research about the risk prediction of coal mine roof accidents.

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Section: Literature Reviewmentioning

confidence: 99%

A new fusion method to predict coal mine roof accidents

Liu

et al. 2023

Quality & Reliability Eng

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“…Lu et al 12 investigates the effectiveness of four gas drainage methods (high drill holes drainage, buried pipe drainage, adjacent roadway drainage and tail roadway drainage) 13 , 14 for gas control in air return roadway. Skotniczny 15 and Guo 16 et al studied the transport pattern of gas from the upper corner. Li et al 17 investigated methods for managing gas in the upper corner at different gas outflow levels.…”

Section: Introductionmentioning

confidence: 99%

Study on the optimal position of the roof low roadway based on the response surface methodology

Zhu

Fang

Huo

et al. 2021

Sci Rep

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For determine the optimum position of the roof low roadway, the optimal solution is derived according to the response surface methodology. The UDEC numerical simulation of the overburden gives the porosity distribution of the strike fractured zone, the upper limit heights of the caving zone and the fractured zone are obtained as 18 m and 65 m, respectively. Based on the porosity distribution, the FLUENT numerical models of the goaf zone, air inlet roadway, air return roadway, working face and roof low roadway were established to simulate the gas concentration in the upper corner and gas drainage volume in roof low roadway during mining. Using the vertical and horizontal distance of the roof low roadway as the influencing factors, the experimental scheme of the position of the roof low roadway was designed according to the response surface method, and the response values were obtained from the FLUENT simulation experiments, predicting that the vertical and horizontal distances of the roof low roadway were 7.7 m and 5.9 m respectively when the interaction between the gas concentration in the upper corner and gas drainage volume in roof low roadway was optimal. Field tests showed that the average gas concentration in the upper corner and the average gas drainage volume in roof low roadway were 0.432% and 40.861 m3/min respectively, both of which were less than 10% of the error from the simulations. The design of the roof low roadway has effectively managed the gas accumulation problem in the upper corner.

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“…Currently, high-positioned THR with a distance of more than 50 m between the THR and coal seam were taken as the background in extant studies, mainly on the fracture instability and control technologies [8,9]. The elastic energy stored in the THR which is absorbed by the thick collapsed immediate roof could alleviate the disturbance of THR instability to the working face.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

et al. 2021

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Based on the occurrence conditions of a thick and hard main roof and wedge-structure immediate roof in the Zhuxianzhuang Coal Mine, the fracture characteristics and instability migration law of a thick and hard roof (THR) were examined via physical simulations. Mining zones were divided with respect to the strata behaviors and roof control difficulty levels, and the principles and methods of zonal control under THR were put forward. This study proposed a coordinated control strategy of using confined blasting in water-filled deep holes, and reasonable support optimization, which could effectively reduce the roof fracture size, increases the supporting intensity and eliminate roof-control disasters. The length of confined blasting blocks and supporting intensity were calculated using a mechanical model for roof control in the strong strata behavior zone and less-strong strata behavior zone. These key parameters were determined as 20–25 m and 1.15–1.28 MPa, respectively, and the mining strategy was successfully applied in working face 880, performing high security and reasonable economical efficiency.

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Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Cited by 9 publications

References 34 publications

A new fusion method to predict coal mine roof accidents

A new fusion method to predict coal mine roof accidents

Study on the optimal position of the roof low roadway based on the response surface methodology

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

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