Strata behavior at fully-mechanized coal mining and solid backfilling face

Yin, Wei; Chen, Zhiwei; Quan, Kai; Mei, Xiancheng

doi:10.1186/s40064-016-3281-3

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…As a new partial backfilling method, the research on BCCFM mainly focuses on system layout and mining craft, while there are few studies on strata behavior and ground control of BCCFM. The researches have shown that there are distinct differences in overburden movement and strata behavior between traditional caving mining and gangue backfill mining [18][19][20]. The BCCFM workface integrates backfilling section and caving section within the same workface, and the strata strata behavior of the BCCFM workface will inevitably show its unique law.…”

Section: Introductionmentioning

confidence: 99%

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

et al. 2020

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This article analyzes the technical difficulties in full-section backfill mining and briefly introduces the technical principle and advantages of backfilling combined with caving fully mechanized mining (BCCFM). To reveal the strata behavior law of the BCCFM workface, this work establishes a three-dimensional numerical model and designs a simulation method by dynamically updating the modulus parameter of the filling body. By the analysis of numerical simulation, the following conclusions about strata behavior of the BCCFM workface were drawn. (1) The strata behavior of the BCCFM workface shows significant nonsymmetrical characteristics, and the pressure in the caving section is higher than that in the backfilling section. φ has the greatest influence on the backfilling section and the least influence on the caving section. C has a significant influence on the range of abutment pressure in the backfilling section. (2) There exits the transition area with strong mine pressure of the BCCFM workface. φ and C have significant effect on the degree of pressure concentration but little effect on the influence range of strong mine pressure in the transition area. (3) Under different conditions, the influence range of strong mine pressure is all less than 6 m. This article puts forward a control strategy of mine pressure in the transition area, which is appropriately improving the strength of the transition hydraulic support within the influence range (6 m) in the transition area according to the pressure concentration coefficient. The field measurement value of Ji15-31010 workface was consistent with numerical simulation, which verifies the reliability of control strategy of the BCCFM workface.

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Section: Introductionmentioning

confidence: 99%

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

et al. 2020

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“…This significantly threatens the stability of surface infrastructure [9,10,11]. Many numerical studies have been conducted to predict the stress developed in backfilled gob.…”

Section: Introductionmentioning

confidence: 99%

“…In the process of mining over a certain seam thickness, the overlying rock strata movement and surface subsidence start from the immediate roof, and gradually transfer upward to the ground surface. This significantly threatens the stability of surface infrastructure [ 9 , 10 , 11 ]. Many numerical studies have been conducted to predict the stress developed in backfilled gob.…”

Section: Introductionmentioning

confidence: 99%

Deformation Monitoring of Waste-Rock-Backfilled Mining Gob for Ground Control

Zhao

Zhang

et al. 2017

Sensors

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Backfill mining is an effective option to mitigate ground subsidence, especially for mining under surface infrastructure, such as buildings, dams, rivers and railways. To evaluate its performance, continual long-term field monitoring of the deformation of backfilled gob is important to satisfy strict public scrutiny. Based on industrial Ethernet, a real-time monitoring system was established to monitor the deformation of waste-rock-backfilled gob at −700 m depth in the Tangshan coal mine, Hebei Province, China. The designed deformation sensors, based on a resistance transducer mechanism, were placed vertically between the roof and floor. Stress sensors were installed above square steel plates that were anchored to the floor strata. Meanwhile, data cables were protected by steel tubes in case of damage. The developed system continually harvested field data for three months. The results show that industrial Ethernet technology can be reliably used for long-term data transmission in complicated underground mining conditions. The monitoring reveals that the roof subsidence of the backfilled gob area can be categorized into four phases. The bearing load of the backfill developed gradually and simultaneously with the deformation of the roof strata, and started to be almost invariable when the mining face passed 97 m.

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“…The development and utilization of coal resources have greatly promoted the development of China [1,2]. However, at present, the coal resources under good mining conditions, such as in shallow buried and large thickness settings, in the eastern part of China have been gradually depleted [3]. To ensure the balance of the mine production capacity, extend the service life of the mine, and improve the recovery rate of resources, some mines must turn into coal resources with relatively difficult mining conditions, such as thin coal seams and coal seams under villages [4].…”

Section: Introductionmentioning

confidence: 99%

A New Thin Seam Backfill Mining Technology and Its Application

et al. 2017

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Abstract:Backfill mining is an effective way to control ground subsidence and govern gangue. To solve the problem of thin coal seam mining under villages, a new thin seam backfill mining technology was proposed. This paper investigated a reasonable proportion of filling materials by experiments, designed the filling system and introduced key technologies for thin seam working face filling. Finally, an industrial test of thin seam backfill mining technology was carried out in the C1661 working face, Beixu Coal Mine. The results show that the developed filling material meets both the pumping liquidity and strength requirements of the filling body during the early and late stages. The design and equipment selection of the paste filling system were reasonable. By using the key technologies for thin seam working face filling, the time needed for working face filling, the connection and disconnection of the filling pipeline and gob-side entry retaining were all greatly shortened. The labor intensity of the workers was reduced, and the mechanization level of the mine was improved. A fill mining length of 480 m was successfully completed. With effective roof subsidence control, the ground subsidence can be reduced, and good results can be achieved. This study can contribute to the development of backfill mining in thin coal seams.

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Strata behavior at fully-mechanized coal mining and solid backfilling face

Cited by 8 publications

References 11 publications

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

Deformation Monitoring of Waste-Rock-Backfilled Mining Gob for Ground Control

A New Thin Seam Backfill Mining Technology and Its Application

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