Floor damage mechanism with cemented paste backfill mining method

Shi, Xianyuan; Zhou, Hang; Sun, Xingshu; Cao, Zhong; Qing-min, Zhao

doi:10.1007/s12517-020-06368-6

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…FLAC3D fluid-structure coupling model is used to analyze the law of floor instability under the influence of mining and confined aquifer. In the FLAC3D fluid-structure coupling module, the rock mass is regarded as a porous medium, and the fluid meets Darcy's law and Biot's classical seepage equation (Duan and Zhao, 2021;Zhang et al, 2021;Shi et al, 2021). After entering the fluid-structure coupling calculation mode, the reasonable selection of rock mass and fluid seepage parameters has a great impact on the calculation results.…”

Section: Test Methodsmentioning

confidence: 99%

Study on floor instability law of cemented filling mining above a confined aquifer

Wang

2023

Bilimsel Madencilik Dergisi

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To solve the problem of floor water inrush in the process of coal mining on a confined aquifer and study the law of floor instability, a cemented filling mining method is proposed in the paper. Using river sand and cement as filling materials, the cementitious material with a concentration of 75% and cement content of 15% has the best flow and mechanical properties. Based on the elastic half-space theory and the bearing characteristics of the backfill, the mechanical model of floor stability is established, the critical criterion of floor instability is proposed, and the relationship between the failure depth of floor and the location and pressure of confined aquifer is obtained. The numerical simulation test scheme is designed, and the FLAC3D fluid-structure coupling element is used to explore the instability characteristics of the floor in the mining process. The research results show that the failure depth of the floor will gradually decrease with the increase of the strength of filling materials, the increase of aquifer distance, and the decrease of water pressure. The research results provide a useful reference for the study of safe mining of coal resources on a confined aquifer.

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Section: Test Methodsmentioning

confidence: 99%

Study on floor instability law of cemented filling mining above a confined aquifer

Wang

2023

Bilimsel Madencilik Dergisi

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“…During the mining operation, as the slurry is continuously filled into the goaf, the backfill material gradually solidifies and forms a stable support carrier, thereby limiting the sinking of the overlying rock layer, causing the rock layer to bend and sink, and preventing the irregular collapse of the roof (Shi et al, 2021). The pressure on the roof above the thick coal seam can be considered the uniform load (q 0 ), while the roof's rocking beam is considered the elastic foundation beam.…”

Section: Analysis Of the Mechanical Model Of Continuous Curved Beamsmentioning

confidence: 99%

Overburden and surface subsidence with slicing paste filling mining in thick coal seams

Zheng

Wang²,

Pang³

2023

Front. Earth Sci.

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To overcome the difficulties of overburden failure and surface subsidence induced by the slicing mining of extra-thick coal seams, slicing filler paste is typically utilized. In this paper, a continuous curved beam mechanical model of paste filling mining was established by theoretical analysis against the background of the 3305 working face of Yangcheng Coal Mine, the main controlling factors of surface subsidence were analyzed using an orthogonal experiment method (OEM) and an analytic network process (ANP) coupled comprehensive assignment, and the vertical displacement distribution of the overlying rock under different filling intensity was simulated using numerical simulation software. The following main findings were obtained. First, the elastic modulus of the backfill is the primary regulating factor, as demonstrated by the results. Second, the greater the filling body’s elastic modulus, the more efficiently it carries the overburden load and minimizes the maximum surface subsidence. Third, the distance from the open-cut mine likewise reflects the degree of surface subsidence, with the amount of subsidence increasing as the distance from the mine increases.

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“…Currently, paste backfill mining technology is popularly used in coal mine due to its high safety, high recovery rate, small ground subsidence, and minor mining disturbance. In the previous work of our team, we found that the cemented paste backfill mining method is effective to control the failure depth of floor [32]. Also, Yu et al [33] combined the strip mining method and caving zone backfill technology to recover the retained strip coal pillars above the confined aquifer and successfully prevent water inrush from the coal floor.…”

Section: Introductionmentioning

confidence: 95%

Investigation on Failure Characteristics of Coal Seam Floor in Paste Filling Working Face

et al. 2021

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Water inrush disasters are extremely prone to occur if the coal seam floor contains a confined aquifer. To find out the failure behavior of coal seam floor of paste filling working face, a beam-based theoretical model for the floor aquifuge was built, and then, the water inrush risk was evaluated based on the thickness of floor aquifuge. Next, the floor failure characteristics of the paste filling face was numerically studied and the effects of the filling interval and long-term strength of the filling body on the floor failure depth, stress and displacement distributions, and plastic zone were explored. The results showed that the theoretical model for evaluating the safety of the floor of the paste filling face based on the empty roof distance is proved to be consistent with that of the empirical formula judged based on the assumption that the paste filling working face was regarded as a cut hole with a certain width. The filling interval has a significant effect on the stress concentration of the surrounding rock, failure depth of floor, and roof-floor convergence. The smaller the filling interval is, the smaller their values are. When the filling rate is 98%, the long-term strength of the filling body is 5 MPa, and the floor failure depth is not more than 4 m. In contrast, the strength of the filling body has no obvious influence on the floor failure depth, but it has a certain impact on the roof-floor convergence. From the perspective of reducing floor failure depth, there is no need to increase the long-term strength of backfill, but it is necessary to increase the early strength of backfill so as to reduce the width of the equivalent roadway.

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Floor damage mechanism with cemented paste backfill mining method

Cited by 10 publications

References 12 publications

Study on floor instability law of cemented filling mining above a confined aquifer

Study on floor instability law of cemented filling mining above a confined aquifer

Overburden and surface subsidence with slicing paste filling mining in thick coal seams

Investigation on Failure Characteristics of Coal Seam Floor in Paste Filling Working Face

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