Evolution of mining‐induced stress in fully mechanized top‐coal caving under high horizontal stress

Huo, Yuming; Song, Xiaojie; Sun, Zedong; Wang, Zhonglun

doi:10.1002/ese3.658

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…During the stage of dynamic coupling known as instability, the lower top coal is broken, a stress concentration takes place at the coal wall, and the contact region between the top coal and the lower immediate roof is broken as a result of excessive extrusion pressure. This conclusion is supported by reference [54]. Compared with the rotary instability at the coal wall, the impact dynamic load caused by the rotary instability at the roof cutting is much smaller, and the crushing degree of top coal is also smaller.…”

Section: Bearing Characteristics Of the Canopymentioning

confidence: 61%

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

Zeng

Wan

et al. 2023

Applied Sciences

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In longwall top coal caving (LTCC), due to the fracture and migration of top coal, the roof will break and collapse, which causes serious impact damage to hydraulic support. Therefore, we aimed to reveal the relationship between the roof instability effect and the bearing characteristics of hydraulic support in the LTCC face. Based on the occurrence conditions of the 08 mining area in the Shilawusu Coal Mine, the instability model of the upper immediate roof was established, and the working resistance of hydraulic support was derived. Secondly, the dynamic coupling model of roof-top coal-hydraulic support was established in LS-DYNA, and the crushing degree of top coal and the bearing characteristics of the hydraulic support in different roof instability fields were analyzed. The results show that the main factors affecting the working resistance of hydraulic support are the fracture position of the upper immediate roof, the acting force of the lower immediate roof, and the distribution of the gangue in the goaf. The rotary instability of the upper immediate roof at the coal wall brings serious impact effects, resulting in fractures in front of the coal wall and a large amount of crushed coal concentrated at the front end of the canopy. The crushing degree of top coal significantly impacts the canopy, especially the back end of the canopy and the hinged pin shaft, which is prone to bending fracture. The research results can provide references and experience for the stability control of roof strata and the structural optimization of hydraulic support.

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Section: Bearing Characteristics Of the Canopymentioning

confidence: 61%

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

Zeng

Wan

et al. 2023

Applied Sciences

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“…Therefmining, research into the evolution of mining-induced stress eld is key to understanding failure mechanisms of top-coal. By taking the FMTC face in Wangjialing Coal Mine (China) as the engineering background and using eld measurement and numerical simulation, Huo et al (2020) studied the evolution of the principal stress eld in FMTC under high horizontal stress.…”

mentioning

confidence: 99%

Effect of Face Length in Initial Mining Stage of Fully Mechanized Top-Coal Caving Face with Large Mining Height

Wang

et al. 2021

Geotech Geol Eng

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Based on the eld measurement of the end resistance of the support during the initial weighting of the basic roof and the macroscopic mine pressure behavior during the weighting period of 101,22211,103 and 301 fully mechanized caving face in Changchun Xing Coal Mine, the mine pressure law of the working face is summarized and compared, and the relationship between the working face length and the working resistance of the support ( the weighting strength ) and the macroscopic mine pressure behavior is obtained. In the range of face length 126-230 m, with the increase of face length, the end-of-cycle resistance of the support gradually increases and the dynamic load coe cient of the support gradually increases when the coe cient of the support gradually increases, and the strata behavior of the working face changes from strong to very strong. When the face length is short ( 126-140.5m ), the hanging top area is too large to cause hurricanes when the working face is pressed, which threatens and damages the personal safety and equipment of the working face staff. Based on the above research, the problem of optimizing the surface length is proposed, and the surface length is determined to be within the range of 140-230 m according to the measured results.

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Stability Mechanism and Control Technology for Fully Mechanized Caving Mining of Steeply Inclined Extra-Thick Seams with Variable Angles

Wang

Jianqiang

et al. 2020

Mining, Metallurgy & Exploration

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Evolution of mining‐induced stress in fully mechanized top‐coal caving under high horizontal stress

Cited by 8 publications

References 24 publications

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

Effect of Face Length in Initial Mining Stage of Fully Mechanized Top-Coal Caving Face with Large Mining Height

Stability Mechanism and Control Technology for Fully Mechanized Caving Mining of Steeply Inclined Extra-Thick Seams with Variable Angles

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