Evaluation of plow system performance in long-wall mining method using particle flow code

Ajamzadeh, Mohammadreza; Sarfarazi, Vahab; Dehghani, Hesam

doi:10.1007/s40789-019-00266-3

Cited by 13 publications

(4 citation statements)

References 28 publications

(18 reference statements)

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“…In the process of OPUG, the effects of underground and opencast mining are both mutual superimposition, forming a large dynamic composite system, so the deformation mechanisms of slopes and rock bodies are more complicated, and the slope already formed within the opencast mine will be affected by the disturbance of the underground mining. Settlement deformation and weak layer activation will continuously occur, posing a serious threat to the stability of the slope and safe production [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Stability Control Technology of Slope during Open-Pit Combing Underground Extraction: A Case Study from Shanxi Province of China

Shi¹,

Guo

Ding

et al. 2022

Sustainability

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With the development of society, the demand for mineral resources is gradually increasing, and the current situation of decreasing total resources dictates the inevitable interaction between open-pit combing underground extraction (OPUG) in time and space. In this research, we took the Anjialing coal mine in Shanxi Province of China as a case study, and tested the physical and mechanical properties of coal rocks in the laboratory. The similarity criterion was used to build a similar experimental model for the deformation evolution of the slope of the open-pit mine section; the digital scattering method was used to test the influence of the underground mining process parameters on the deformation evolution of the open-pit slope. The results showed that there was an obvious distribution of “three zones” above the mining goaf, namely, a collapse zone, fracture zone, and slow subsidence zone. When the mining face was continuously advanced towards the bottom of the open pit, the supporting stress of the mining face transferred to the side of the open-pit slope. Additionally, large displacement and stress concentration were observed on the slope near the stoping line, which caused the slope body to move along the uppermost part of the slope first, and thereafter along the lower part. Various techniques for slope stability control are discussed, including the optimization of spatial and temporal relationships between open-pit and underground mining, the optimization of mining plans, and the use of monitoring and early warning systems. The results can provide a guide for slope stability control of similar open-pit mines in the process of mining coal resources.

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Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Stability Control Technology of Slope during Open-Pit Combing Underground Extraction: A Case Study from Shanxi Province of China

Shi¹,

Guo

Ding

et al. 2022

Sustainability

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“…Therefore, cracks in the coal seam and their distribution characteristics have an important influence on the grouting effect. At present, the research on grouting engineering has mainly focused on the influence of grouting pressure, permeability coefficient, and other parameters on the grouting effect, while the influence mechanism of primary cracks in the coal mass on grouting has not been widely discussed (Kvartsberg and Fransson 2013;Cheng et al 2018;Bezuijen et al2011;Ajamzadeh et al 2019;Hu et al2019). In the present study, through the discrete element simulation method, the grouting process in soft coal seam was studied by microscopic simulation.…”

Section: Introductionmentioning

confidence: 99%

Macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Hao

Jia

Liu

et al. 2021

Int J Coal Sci Technol

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Grouting is an important method to reinforce soft coal roadway, and the presence of primary cracks in the coal body has an important influence on the grouting effect. With the discrete element simulation method, the grouting process of the soft coal seam was simulated. The mechanism of primary cracks on grouting was revealed, while the influence of fracture characteristics and grouting pressure on the grouting effect was analyzed. The results demonstrated that grouting in the soft coal seam involves the stages of seepage, rapid splitting, slow splitting, and stability. Due to the presence of primary cracks, the grouting diffusion radius increased significantly. Under the slurry pressure, the tensile stress concentration was formed at the crack tip, and the slurry split the coal once the splitting pressure was reached. In addition, the distribution characteristics of fractures are found to have a great influence on the grouting effect. It is observed that smaller fracture spacing is associated with a larger slurry diffusion radius and thus easier penetration of the primary crack tips. The fracture angle affects the direction of fracture propagation. The secondary fracture formed by splitting is a tensile fracture, which is more likely to extend along the direction parallel to the maximum principal stress. Overall, these simulation results have guiding significance for the setting of reasonable spacing of grouting holes in the practice of grouting engineering.

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“…Hard coal is mined almost exclusively using longwall techniques based on longwall systems. Shearer (Krauze, 2010;Biały, 2016) and plow (Ajamzadeh et al, 2019) longwall systems are sets of machines that enable effective extraction of coal from seams. Such complexes are offered by many manufacturers and are widely used all over the world (Dyczko et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Operational Tests of a Modular Installation and Transport Assembly of Steel Arch Support in Underground Excavations

Krauze

Mucha

Wydro

et al. 2021

Multidisciplinary Aspects of Production Engineering

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The roof support, especially the ŁP yielding steel arch support, is transported and assembled in the face with the use of auxiliary machines. This activity in Polish underground mines causes numerous problems, which until present have not been solved. Currently, transport and assembly are carried out manually, while the roadheader and suspended rail are used only to a small extent. Therefore, the modular installation and transport assembly was developed jointly by FAMA Sp. z o. o. and AGH University of Science and Technology. The solution in question enables performing a number of functions (including transport and assembly of all kinds of support arches), which are not available in currently manufactured equipment. The proposed manipulator solves numerous problems occurring during the installation of the steel arch support in an underground mining excavation and significantly improves the process of drilling galleries. This innovative solution considerably differs from the existing ones, and its greatest advantage is versatility with regard to the cross-section and equipment of the roadway, as well as a wide range of functions. In addition, it can also be used for reloading works. The modular installation and transport assembly together with a platform, a temporary mechanized roof support and a mining machine, make up a mechanizes roadheader complex, which enables continuous mining, loading and installing the permanent support in underground workings.

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Evaluation of plow system performance in long-wall mining method using particle flow code

Cited by 13 publications

References 28 publications

Failure Mechanism and Stability Control Technology of Slope during Open-Pit Combing Underground Extraction: A Case Study from Shanxi Province of China

Failure Mechanism and Stability Control Technology of Slope during Open-Pit Combing Underground Extraction: A Case Study from Shanxi Province of China

Macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Operational Tests of a Modular Installation and Transport Assembly of Steel Arch Support in Underground Excavations

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