A roof model and its application in solid backfilling mining

Feng, Jie; Huang, Peng; Guo, Shuai; Xiao, Meng; Lan, Lixin

doi:10.1016/j.ijmst.2016.11.001

Cited by 37 publications

(17 citation statements)

References 2 publications

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“…In some coal mines, this ratio has reached 100%. [5][6][7][8] The preliminary coal mining method, in which villages are moved, is often used for mining, and the coal recovery rate can be guaranteed. However, the cost of moving villages is too high, villages occupy a large amount of land, and new residence choices are limited.…”

Section: Introductionmentioning

confidence: 99%

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Ning

Wang

Pan

et al. 2020

Energy Science & Engineering

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The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to investigate the stress and surface subsidence of a filling body (or coal pillar) under two filling sequences through theoretical analysis, similar simulation tests, and numerical simulations. To achieve optimal filling materials for the Liudong Coal Mine, a low-strength similar paste filling material composed of fly ash, gypsum, and sand was developed. The relationships between the strength and the cement ratio and between the strength and the sand-binder ratio were discussed. Similar simulation tests showed that mining scheme 1 (mining before filling) could lead to the formation of an isolated island coal pillar in the mining process, mining scheme 2 (filling before mining) had less influence on surface subsidence, and the stress on the filling body was smaller for scheme 2 than for scheme 1. The distributions of the stress and plastic zone in the two different mining and filling sequences were obtained through numerical simulations. The method of first filling and then mining could greatly reduce the stress concentration and plastic zone during the mining process. In summary, mining scheme 2 (filling before mining) can avoid the formation of isolated island coal pillars in the process of mining, and without considering other factors, scheme 2 should be adopted as much as possible.

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Section: Introductionmentioning

confidence: 99%

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Ning

Wang

Pan

et al. 2020

Energy Science & Engineering

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“…SBM can be implemented to protect aquifers and reduce surface subsidence effectively as soil and water loss are serious in the mining area of the northern Shaanxi province; this would also help realize coal mining with water conservation [12][13][14][15]. The SBM technology is, thus, a potential solution to the above challenges.In recent years, research on strip backfilling mining of small and medium-sized mines in China's northern Shaanxi province has been gradually increasing [16][17][18][19][20][21]. Several scholars have studied the stability of coal pillars and overburden in SBM [22][23][24][25].…”

mentioning

confidence: 99%

“…In recent years, research on strip backfilling mining of small and medium-sized mines in China's northern Shaanxi province has been gradually increasing [16][17][18][19][20][21]. Several scholars have studied the stability of coal pillars and overburden in SBM [22][23][24][25].…”

mentioning

confidence: 99%

Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining

Shao

Wang

et al. 2020

Energies

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During strip backfilling mining in coal mines, the backfilling material is the main support structure. Therefore, studying the pressure law of the backfilling material is essential for the safe and efficient mining of coal resources. Based on research into strip backfilling mining at working face number 3216 of the Shanghe Coal Mine, and to smooth transition of overlying strata loads to the backfilling material, this study proposes a three-stage strip backfilling mining method. Based on thin-plate theory, an elastic thin-plate model, a reasonable spacing of strip mining is constructed, and the reasonable mining parameters of “mining 7 m to retain 8 m” at working face number 3216 of the Shanghe Coal Mine are determined. The law of backfilling pressure in three-stage strip backfilling mining is studied through numerical simulation and physical simulation experiments. The results show that field measurement results are basically consistent with the experimental results and numerical simulation results. When three-stage strip backfilling mining is adopted, the stage-one backfilling material is the main bearing body to which the overlying rock load transfers smoothly and gradually, and the structure of the “overburden-coal pillar (or backfilling strip)” in the stope remains stable. In three-stage strip backfilling mining, the overlying rock load is ultimately transferred to the stage-one backfilling material, the stage-two backfilling material is the auxiliary bearing body, and the stage-three backfilling material mainly provides long-term stable lateral support for the stage-one backfilling material.

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“…The YAS-5000 electro-hydraulic servo-controlled rock mechanic test system, manufactured by Changchun Kexin Test Instrument Company, was employed for the backfill material compaction tests. The literature [20] gives detailed information about steel circular cylinder for testing. The uniaxial compaction tests were performed on five selected backfilling materials by using the steel circular cylinder, for 0-10 MPa stress in the axial direction, with a loading rate of 1 kN/s.…”

Section: Test Equipment and Schemementioning

confidence: 99%

Control Effects of Five Common Solid Waste Backfilling Materials on In Situ Strata of Gob

et al. 2019

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Solid backfill mining as a green mining method has already been successfully applied in many mine sites. Higher requirements for the backfilling materials have been put forward in special regions, such as shallow coal seams, ecologically susceptible areas, and sites with building on the surface. The control effects of common backfilling materials on in situ strata of gob need to be studied and compared to ensure the suitable materials are applied in the mine. The meso-structure, stress variation, energy dissipation, and backfilling effects of the five common solid backfilling materials, which are Aeolian sand, gangue, mineral waste residue, coal ash, and loess are analyzed in this paper. The results show that the Aeolian sand and gangue are densely packed and internally hard when compared to other backfill materials. The deformation of the five materials to absorb the same amount of energy in the order of higher to lower was determined as Aeolian sand, gangue, mineral waste residue, coal ash and loess. The Aeolian sand’s strain energy density is 1.67 times larger than the loess, however, the Aeolian’s strain energy density in front of working face is just 32.2% of the loess, which is important to ensure the safety of the working face. The stress changes were monitored in situ with Aeolian sand and gangue as backfill materials. The monitoring results show that the Aeolian sand stress increase rate is quicker than gangue, which can support the roof effectively.

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A roof model and its application in solid backfilling mining

Cited by 37 publications

References 2 publications

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining

Control Effects of Five Common Solid Waste Backfilling Materials on In Situ Strata of Gob

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