Raw Gangue Filling Mining under Construction &amp;lt;br/&amp;gt;—A Case Study in China

Li, Daqing; Wang, Changxiang; Xiao, Jinjie; Lü, Wei; Zhang, Baoliang; Zongkai, Li; Tong, Xiaozhang

doi:10.4236/eng.2023.153014

Cited by 2 publications

(1 citation statement)

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“…In response to the environmental degradation caused by coal mining, green mining has gradually become a consensus in the mining industry. 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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