Research on the Stability Evaluation Model of Composite Support Pillar in Backfill-Strip Mining

Zhu, Xiaojun; Guo, Guangli; Liu, Hui; Peng, Xueni; Yang, Xiaoyu

doi:10.1155/2020/3138258

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…e width of filling working face and coal pillar is also different according to the different filling materials. Zhu [27] divides the stable CSP into three types, namely, Type I, Type II, and Type III CSP, and using the elastic-plastic theory, the calculation method of the minimum residual coal pillar and the width of the backfilling working face under the stable condition of different types of CSP is presented. e residual coal pillars in Type I CSP are wide (Figure 3).…”

Section: Safety Width Calculation Of the Residual Coal Pillar And Backfilling Working Face In Backfill-strip Miningmentioning

confidence: 99%

Subsidence Control Design Method and Application to Backfill‐Strip Mining Technology

Zhu

Zha

Guo

et al. 2021

Advances in Civil Engineering

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Intensive and massive coal mining causes a series of geological hazards and environmental problems, especially surface subsidence. At present, two major types of subsidence control technology are applied: backfilling technology and partial mining technology. However, the cost of backfill mining is high and partial mining has a low recovery ratio. Therefore, the backfill-strip mining is used to solve the problems of high cost and shortage of filling materials in coal mines at present. A subsidence control design method of backfill-strip mining was proposed in this paper based on the subsidence control effects and economic benefits. First, the stability of the composite support pillar of the filling body and coal pillars in the backfill-strip mining is analyzed, and the values of the main subsidence influencing factors that include the filling material, the size of the backfilling working face, caving mining face, and residual coal pillar are preliminarily determined. Then, the surface movement and deformation are predicted based on the equivalent superposition probability integral method (PIM). The subsidence influencing factors are optimized and determined by comparing the requirements of the safety fortification index of the antideformation ability of surface buildings, resource recovery rate, and coal mining cost. Finally, the mining scheme design parameters of the backfill-strip mining technology are determined. This method is applied in the subsidence control design of backfill-strip mining in the Ezhuang coal mine. Research results show that backfill-strip mining can ensure the safety of surface buildings, increase the resource recovery rate, and reduce coal mining costs through the reasonable design of this method. This study can provide scientific guidance for subsidence disaster control, prevention, and engineering design in backfill-strip mining.

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Section: Safety Width Calculation Of the Residual Coal Pillar And Backfilling Working Face In Backfill-strip Miningmentioning

confidence: 99%

Subsidence Control Design Method and Application to Backfill‐Strip Mining Technology

Zhu

Zha

Guo

et al. 2021

Advances in Civil Engineering

Self Cite

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“…In order to monitor the pressure change of the filling body [13][14][15][16], filling body pressure monitoring gauges were installed, respectively, at a distance of 0. As shown in Figure 6, within the range of 0-18.5 m behind the working face, the pressure on the filling body due to the flexible formwork concrete near roadway increased rapidly, from 141 t at 0.3 m to 275 t at 0.6 m. Consequently, the filling body pressure gauge failed to monitor at 0.3 m due to the pipeline damage.…”

Section: Filling Body Pressure Monitoringmentioning

confidence: 99%

Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side

Meng

Hui

et al. 2020

Advances in Civil Engineering

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This paper studies and introduces the successful case of gob-side entry retaining technology and the typical mining pressure law in Luan mining area, which is the main mining coal seam in Qinshui coalfield. Qinshui coalfield has an estimated coal reserve of 300 billion tons, accounting for 9.58% of the total national coal reserve in China, especially anthracite, chemical coal, and coking coal. The methods of field investigation, theoretical analysis, physical experiment, and industrial test are adopted. Through the field investigation, theoretical analysis, physical experiments, and industrial test, the following conclusions have been drawn in this study: (1) A thorough engineering geological investigation was conducted on the entry retaining along the gob side on noncoal pillar mining working face, which covers multiple periods of mining process including the roadway excavation period, primary mining period, primary mining stability period, and secondary mining influence period. A series of analysis and tests were conducted such as core sampling, rock mechanics property testing, borehole detection, and flexible formwork support evaluation, which laid a foundation for identifying the mining pressure law of gob-side entry retaining by using noncoal pillar mining. (2) The mining pressure law was studied through the collection of the field measurements taken from the entry retaining along the gob side on noncoal pillar mining working face. The keys to achieve the roadway surrounding rock stability through noncoal pillar mining are obtained. According to the study, the stability control of retained roadway surrounding rock mainly depends on the stability of top coal, coal side, and shoulder angle coal. (3) In this study, a roadway reinforcement scheme is proposed to improve the surrounding rock control technology for gob-side entry retaining by noncoal pillar mining, whose effectiveness has been verified by a series of industrial test. Therefore, the wide adoption of the noncoal pillar mining method in Number #3 coal mine can significantly relieve the predicament of coal pressing under a large number of buildings in Luan mining area, which provides insightful guidance to the coal-free pillar mining in the whole Luan mining area.

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“…For a long time, the main mining method of coal under villages is strip mining, which alleviates the problem of "three under" pressed coal to a certain extent. Many scholars have done a lot of research on strip mining [18][19][20][21][22]. However, the strip mining still faces some problems: first, the coal recovery rate is low, and nearly 50% of the strip coal pillars are left in the underground, which causes a lot of waste of resources and is not conducive to the sustainable development of the coal industry.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

Sun

et al. 2021

Geofluids

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In many mining areas, there is a lot of pressed coal under buildings, railways, and water bodies, and there are geological conditions of thick unconsolidated layers, so the surface subsidence has certain particularity. The key to solve the problem of pressed coal is the control technology of surface subsidence. The development of strip filling technology provides a kind of economical and effective surface subsidence control technology. With the passage of time, the natural weathering, flow, and fracture of some coal pillars may lead to the instability and failure of some coal pillars. Therefore, the selection of filling parameters plays an important role in the stability of coal pillars. In order to study the influence factors of surface movement and deformation, considering the influence factors of filling rate, key layer thickness, filling body strength, and unconsolidated layer thickness, FLAC 3D was used to simulate the surface movement deformation, and the orthogonal test method was used to analyze the simulation results, and the sensitivity of the main control factors affecting the surface deformation affected by strip filling mining was studied. The results show that the order of importance of the four factors on the four surface movement and deformation parameters is filling rate > key layer thickness > filling body strength > unconsolidated layer thickness. The influence of these four factors on the surface movement and deformation parameters is gradually decreasing, but the influence degree of different factors has drawn a certain gradient.

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Research on the Stability Evaluation Model of Composite Support Pillar in Backfill-Strip Mining

Cited by 9 publications

References 16 publications

Subsidence Control Design Method and Application to Backfill‐Strip Mining Technology

Subsidence Control Design Method and Application to Backfill‐Strip Mining Technology

Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side

Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

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