Adapting the Powered Roof Support to Diverse Mining and Geological Conditions

Szurgacz, Dawid; Brodny, Jarosław

doi:10.3390/en13020405

Cited by 35 publications

(27 citation statements)

References 36 publications

(45 reference statements)

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“…The proposed method of numerical calculation for investigation of hydraulic system by the case of the 2-leg shield was not reflected in available literature. There is a wide range of method for an analysis of hydraulic leg safety system reported by various researchers [14][15][16] but does not include the possibility of addressing this problem.…”

Section: Discussionmentioning

confidence: 99%

“…The hydraulic shocks in the safety elements of a hydraulic leg are characterized by vibration frequencies of several hundred Hertz (Hz) and amplitudes significantly exceeding the operating values. The effect of the hydraulic shocks is a loss of tightness in the safety elements of the powered roof support, and reduction or loss of the load bearing capacity of the powered roof support, which consequently may lead to the uncontrolled lowering of the shield height [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

et al. 2021

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The paper describes a case study of the safety hydraulic system damage in the working of a longwall in a Polish coal mine. The safety elements are a component of the powered roof supports which secure the shield against damage during rock burst incidents. The damage event, which occurred in the hydraulic system during the mining process, caused the uncontrolled lowering of the powered roof support height during the mining process. The uncontrolled lowering of a shield may cause the danger of the loss of the stability along the longwall working in the form of a rock burst and collapses and may represent a serious and immediate danger to the safety and health of employees. Based on the results of the computational fluid dynamics methods (CFD) analysis of the safety elements in the hydraulic system of longwall 2-leg shield, the causes of damage were diagnosed and presented. The CFD and the strength analysis by the finite element method (FEM) were used for numerical modeling. The diagrams and maps of changes of parameters having an impact on the damage mechanism in safety elements of the hydraulic leg were developed based on the results of model tests. The forecasted values of stress distributions in the safety system of the hydraulic leg have made it possible to identify the reasons of the damage causes, verified by real observations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

et al. 2021

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“…Coal mining is important globally for the development of modern industry and the information society [1], since it provides a cheap, highly efficient, and low-cost energy resource, easily transported to anywhere in the world [2]. At the same time, the use of coal as an energy resource in the coming decades will be constrained by the environmental problems of its mining, mostly by surface mines, namely the high land consumption of surface mines and the irrevocable disturbance of a significant part of the used land.…”

Section: Introductionmentioning

confidence: 99%

Parameters of Transition from Deepening Longitudinal to Continuous Lateral Surface Mining Methods to Decrease Environmental Damage in Coal Clusters

2020

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The present paper deals with an original way to reduce the environmental damage caused to land and air resources by surface coal mines with external dumping, due to the transition to internal dumping with filling the worked out space of the surface mine with overburden. The basic principle of the proposed idea is the transition from the deepening longitudinal mining method for the development of inclined and steep coal seam strata to lateral ones. This article substantiates the choice of technology for a block-and-layer continuous lateral mining method, including the construction of a first-stage pit, the use of a combined transport and direct dumping technology for moving overburden to an internal dump when mining blocks using draglines. The advantage of the presented technology, along with filling the internal capacity of the surface mine field with overburden, is the possibility of leveling the relief within the boundaries of the pit allotment and the implementation of reclamation as the mining front moves forward, without waiting for the dump to be completely filled in the boundary contours. Attention is also paid to the economic benefits of block-layer technology and the continuous lateral mining method, in the transition to which the overburden transporting costs can be significantly reduced, while the limitations of the proposed method’s implementation concern specific coal deposits that make up a small part of the fields being developed today by surface mining.

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“…One of the basic hazards that are commonly faced by underground hard coal mines is the methane hazard [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This hazard is associated with the emission of methane into underground mine headings during coal exploitation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the methane-bearing capacity in Polish hard coal mines in the years 1993–2018

Tutak

2020

E3S Web Conf.

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The process of underground coal production is inseparably connected with methane emissions. This gas has good energy characteristics and, at the same time, represents a huge threat to the safety of mining exploitation. Due to its flammability and explosiveness, the occurrence of methane-related incidents disturbs the entire production process and is extremely dangerous for the crew. Moreover, methane is a greenhouse gas that has a highly negative impact on the natural environment. These factors make it necessary to carry out works in order to limit its negative effects and increase its use as an energy raw material. The article presents the results of an analysis of the main parameters describing the methane-bearing capacity in Polish hard coal mines. The analysis was conducted within the scope of their absolute values and with reference to one tonne of coal extracted. The purpose of these studies was to identify the changes in the parameters under analysis over the last 25 years in the Polish mining industry and, at the same time, to determine how the structural changes in the mining industry and the entire economy influenced those parameters. This particularly concerns the emission of methane into the environment. The reason is that this value has a huge influence on the opinion about the mining industry. The results presented should be used for works on limiting the harmful effects of methane and increasing the degree of its utilisation in the economy.

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Adapting the Powered Roof Support to Diverse Mining and Geological Conditions

Cited by 35 publications

References 36 publications

Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

Parameters of Transition from Deepening Longitudinal to Continuous Lateral Surface Mining Methods to Decrease Environmental Damage in Coal Clusters

Analysis of the methane-bearing capacity in Polish hard coal mines in the years 1993–2018

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