Association analysis of expansion crack development characteristics and uniaxial compressive strength property of sulphide-containing backfill
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摘要: 含硫膠結充填體隨著養護齡期的延長會出現膨脹開裂現象，存在明顯裂隙的充填體試件再進行單軸抗壓強度測試其結果十分離散，已不能有效地獲得充填體力學參數.在室內進行配比試驗，采用數字圖像處理技術對得到的充填體表面裂隙圖像進行二值化、去噪等預處理，而后計算其分形維數并分析其演化規律，且將分形維數與單軸抗壓強度關聯分析.研究結果表明：充填體試件面表的裂隙存在自相似性，表面裂隙越發育，其分形維數越大；分形維數與單軸抗壓強度存在負相關關系，分形維數越小，其單軸抗壓強度越高；分形維數可判別含硫充填體試件的完整性，當充填體表面裂隙的分形維數小于某閾值時，強度試驗的結果更為可靠.Abstract: The cemented backfill body with sulphide-containing tailings exhibits a swelling phenomenon with an extension of curing age. The test results from the uniaxial compressive strength test of the backfill specimen with an obvious fracture are very discrete, and the mechanical parameters of the filling body will not be obtained effectively. The fractured surface image of the backfill were binarized by the digital image processing technology. Additionally, its fractal dimension was calculated and analyzed. Then, the relationship between fractal dimension and uniaxial compressive strength was established. The results indicate that the cracks on the surface of the backfill specimen exhibite self-similarity. The fractal dimension increases with the development of surface cracks. There is a negative correlation between fractal dimension and uniaxial compressive strength for the sulphide-containing backfill. It is of practical significance to determine the research value of the compression test using the fractal dimension. When the fractal dimension of the surface cracks is less than a certain threshold, the results of the specimen strength tests would be reliable.
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參考文獻
[23] Serafeimidis K, Anagnostou G. On the time-development of sulphate hydration in anhydritic swelling rocks. Rock Mech Rock Eng, 2013, 46(3):619 [25] Ahmed A, El Naggar M H. Swelling and geo-environmental properties of bentonite treated with recycled bassanite. Appl Clay Sci, 2016, 121-122:95 [26] Kiventerä J, Golek L, Yliniemi J, et al. Utilization of sulphidic tailings from gold mine as a raw material in geopolymerization. Int J Miner Process, 2016, 149:104 [27] Ercikdi B, Külekci G, Yılmaz T. Utilization of granulated marble wastes and waste bricks as mineral admixture in cemented paste backfill of sulphide-rich tailings. Constr Build Mater, 2015, 93:573 [28] Benzaazoua M, Bussière B, Demers I, et al. Integrated mine tailings management by combining environmental desulphurization and cemented paste backfill:application to mine Doyon, Quebec, Canada. Miner Eng, 2008, 21(4):330 -
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