Failure characteristics and the damage evolution of a composite bearing structure in pillar-side cemented paste backfilling

Cui, Boqiang; Feng, Guorui; Bai, Jinwen; Xue, Gaili; Wang, Kai; Shi, Xudong; Wang, Shanyong; Wang, Zehua; Guo, Jinyun

doi:10.1007/s12613-022-2545-x

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…The test process is illustrated in Figure 14, and the results are presented in Table 2. According to field-practice experience, the principles for the paste-filling-material ratio are as follows: 1 ⃝ The slump should be greater than 18 cm. 2 ⃝ The stratification of the slurry should be less than 2 cm.…”

Section: Performance-optimization Effect Of Filling Materialsmentioning

confidence: 99%

“…Filling mining can not only increase the coal-recovery rate but also prevent surface subsidence, improving the safety of mining operations. The industry encounters challenges such as insufficient filling materials and low filling efficiency, impeding the broad implementation of filling-mining technology [1][2][3][4][5]. Enhancing the efficiency and reducing the costs of filling mining in coal mines present pivotal research problems.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Mining Effect and Optimal Design of Longwall Full Mining with Paste Partial Filling

Zhou,

Wang,

Liao

et al. 2024

Minerals

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Various methods of longwall full mining with partial filling have been extensively researched to satisfy the specific mining needs of pressurized-coal and residual-coal resources. This study introduces three longwall partial-filling-mining techniques: room–pillar filling mining, parallel-strip filling mining, and vertical-strip filling mining. Numerical simulations are employed to evaluate the efficacy of these methods. The findings indicate that vertical-strip filling mining results in minimal surface deformation and a more uniform distribution of displacements. In practical operations, the effectiveness of filling largely depends on the choice of filling technology and materials. The research further includes an optimization analysis of the filling technology, emphasizing the composition of the coal-gangue-paste filling system and the refinement of its components. Additionally, the study aims to explore the optimization analysis of filling materials, specifically focusing on performance-optimization methods. The experimental results illustrate that optimizing the filling materials can enhance the performance of filling paste, improving both early-stage and long-term compressive strength. Moreover, the paper examines the quantitative characterization of paste-filling-mining subsidence at various stages in conjunction with theoretical knowledge. Subsequently, mining-subsidence-control measures are recommended to address the primary deformation factors across different stages. Through an in-depth examination of filling-method designs, enhancements in filling technology, and predictions regarding filling-mining subsidence, this research offers valuable insights for optimizing longwall partial-filling-mining methods.

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Section: Performance-optimization Effect Of Filling Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Mining Effect and Optimal Design of Longwall Full Mining with Paste Partial Filling

Zhou,

Wang,

Liao

et al. 2024

Minerals

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“…It is widely believed that paste backfilling is an ideal solution for addressing environmental issues associated with coal mining. − The stability of the goaf is closely related to the structural properties of the paste backfill after its implementation. Factors such as temperature, pressure, and chemical composition affect the paste backfill, leading to physicochemical changes and subsequently influencing the filling effect. − …”

Section: Introductionmentioning

confidence: 99%

Evolution of a Filling Paste Cementitious System and Impact Patterns of Sulfate Mine Water Erosion on Filling Paste Performance

Lu,

Wang,

Zhou

et al. 2024

ACS Omega

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To assess the impact of sulfate mine water on filling material performance, an accelerated sulfate erosion process was used to analyze the effects of various erosion concentrations, aging periods, and cation types on the macroscopic properties of the filling paste. These properties encompassed apparent phenomena, mass changes, and alterations in the uniaxial compressive strength. Observations revealed sulfate erosion, causing the formation of white substances and salt crystals on specimen surfaces. Initially, all solution-eroded specimens exhibited increased mass and strength. Over time, specimens in 5 and 10% MgSO 4 solutions displayed the first signs of decline, while variations in other solutions were relatively small. Increasing the erosion concentration led to greater variations in mass and strength during the initial erosion phase. Specimens in 5 and 10% MgSO 4 solutions initially peaked in mass and compressive strength, followed by a decline, while other filling paste specimens continued slow increases. Under equivalent conditions, the MgSO 4 solution exhibited stronger erosion than the Na 2 SO 4 solution. Composite erosion by Na 2 SO 4 and MgSO 4 involved initial strengthening and gel pore filling, intermediate expansion and crystallization, and late-stage substantial degradation, with MgSO 4 exhibiting a more pronounced and complex impact. Gray relational analysis ranked factors affecting mass and uniaxial compressive strength variations as erosion concentration > erosion ion type > erosion aging period. Correlation degrees for factors influencing mass variations were 0.8822, 0.8714, and 0.4754, while for factors influencing uniaxial compressive strength variations, the correlation degrees were 0.8336, 0.7943, and 0.6125, respectively.

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“…The initial velocity of coal gas emission (Δ P ) reflects the ability of the coal body to release gas, which is widely used in coal mine production practice as an important coal and gas outburst prediction index. − It is generally believed that the greater the Δ P , the stronger the initial gas release capacity of the coal body, and the greater the risk of outburst. − After coal seam water injection, the surface of the coal body will be wetted and the Δ P will also change, which has been studied by many scholars. Crosdale et al found that there is a logarithmic function relationship between the Δ P and moisture content, and when the moisture content is 1.4–7.9%, Δ P is decreased the most with the increase in the moisture content.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range

Wang,

Huang,

Liu

et al. 2024

ACS Omega

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Water commonly occurs in coal reservoirs, and it can block the gas flow channels. This has a significant influence on methane transportation within coal. To reveal the gas emission law of water-containing coal across the rank range, three typical coal samples with different coal ranks covering lignite to anthracite were selected in this work. The initial velocity of gas emission (ΔP) under the effect of moisture was measured, and the combination of scanning electron microscopy and mercury injection method was adopted to study the pores and fracture characteristics within coal. Distribution features of oxygen-containing groups in coal were explored by X-ray photoelectron spectroscopy. The microscopic influence mechanism of the water content on ΔP in coal was also comprehensively elucidated. The experimental results show that the moisture content has an obvious inhibitory effect on the ΔP of coal, but the degree of influence on different coal rank samples was different. As the pore space of anthracite (sample XJ) is developed with numerous gas transportation channels, the ΔP has less changes at the lower moisture content (<4.36%). When the moisture content is >4.36%, a large number of water molecules will band together to form water clusters, hindering the gas release, thus greatly reducing the ΔP. However, the change of lignite (sample SL) shows an inverse trend to that of anthracite. Its ΔP is sensitive to the moisture content due to the small number of pores and low porosity. In addition, a great number of oxygen-containing groups in lignite can also provide good surface hydrophilicity for water molecules, and even a small amount of the moisture content (<3.21%) can block most of the pore and facture channels within coal, leading to the remarkable decrease in ΔP. For bituminous coal (sample ML), the distribution of pores and oxygen-containing groups is the most uniform, and the ΔP decreases linearly with the increase in the moisture content.

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Failure characteristics and the damage evolution of a composite bearing structure in pillar-side cemented paste backfilling

Cited by 11 publications

References 42 publications

Study on the Mining Effect and Optimal Design of Longwall Full Mining with Paste Partial Filling

Study on the Mining Effect and Optimal Design of Longwall Full Mining with Paste Partial Filling

Evolution of a Filling Paste Cementitious System and Impact Patterns of Sulfate Mine Water Erosion on Filling Paste Performance

Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range

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