分層廢石膠結充填體的充填效果研究
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1.華潤電力錫林郭勒煤業(yè)有限公司;2.中煤科工集團武漢設計研究院有限公司

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國家自然科學(xué)青年(42007279);中煤科工集團武漢設計研究院有限公司自主研發(fā)項目(ZZYF202238)


Study on the filling effect of layered waste rock cemented backfill.
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China Resources Power Xilingol Coal Industry Co,Xilihaote

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    摘要:

    廢石膠結充填體在充填過(guò)程中常出現分層現象,可能影響充填效果打恕,因此對分層充填體的充填效果進(jìn)行研究具有重要意義。本研究首先對廢石膠結充填體進(jìn)行切片,分析了充填體不同分層的骨料分布特征。然后通過(guò)數值模擬缔沐,對比分析分層和不分層廢石膠結充填體對采空區充填效果的影響。研究發(fā)現:(1)不分層充填體在頂板支護效果、頂板沉降、側幫受力和內部穩定性等方面表現更優(yōu)秀峭桅,能提供更穩定的支護效果,減小頂板沉降,降低側幫受力,保障礦山作業(yè)安全。(2)不分層充填體在頂板中部應力略高于分層充填體,但在頂板兩側的應力分布上更均勻,提供更穩定的頂板支護;頂板沉降程度明顯更小,支護效果優(yōu)于分層充填體;側幫受力均勻,位移較小,相比之下分層充填體的側幫受力較大,位移不均勻。(3)分層充填體上層細骨料分布較多使其易受壓力變形,而不分層充填體內部廢石分布均勻,整體承載能力更強,形變相對較小。綜上所述,不分層廢石膠結充填體在采空區支護效果和穩定性方面表現更出色,因此在進(jìn)行充填體配比時(shí)要盡量控制充填體的分層現象,為礦山運營(yíng)提供重要保障。

    Abstract:

    In the filling process, layered phenomena often occur in cemented waste rock backfill, which may affect the filling effect. Therefore, it is of great significance to study the filling effect of layered backfill. In this study, the cemented waste rock backfill was sliced to analyze the aggregate distribution characteristics of different layers in the backfill. Subsequently, through numerical simulation, the influence of layered and non-layered cemented waste rock backfill on the filling effect of goaf was compared and analyzed. The study found that: (1) Non-layered backfill performs better in terms of roof support, roof subsidence, side wall stress, and internal stability, providing a more stable support effect, reducing roof subsidence, lowering side wall stress, and ensuring the safety of mining operations. (2) The stress in the middle of the roof of non-layered backfill is slightly higher than that of layered backfill, but the stress distribution on both sides of the roof is more uniform, providing a more stable roof support; the degree of roof subsidence is significantly smaller, and the support effect is better than that of layered backfill; the side wall stress is uniform with small displacement, whereas the side wall stress of layered backfill is greater with uneven displacement. (3) The presence of more fine aggregates in the upper layer of layered backfill makes it more susceptible to pressure deformation, while the uniform distribution of waste rocks in non-layered backfill provides a stronger overall load-bearing capacity with relatively small deformation. In conclusion, non-layered cemented waste rock backfill demonstrates superior support and stability in goaf, therefore, efforts should be made to control the layered phenomena in backfill composition, providing crucial support for mining operations.

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  • 收稿日期:2024-04-28
  • 最后修改日期:2024-06-27
  • 錄用日期:2024-06-28
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