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全尾砂膠結充填體的強度敏感性及破壞機制

Strength sensitivity and failure mechanism of full tailings cemented backfills

  • 摘要: 以大冶鐵礦全尾砂為原材料,采用水泥為膠結材料制作全尾砂膠結充填體,采用單因素五水平設計試驗,研究了全尾砂膠結充填體強度與料漿中固相質量分數、灰砂配比及齡期之間的關系,并對敏感性進行了分析.膠結充填體強度隨著料漿中固相質量分數的增加遵循指數函數增長,隨灰砂配比的增加呈線性增長,隨齡期增加遵循指數函數的增長,其中膠結充填體強度對齡期的敏感性最高,料漿中固相質量分數次之,灰砂配比最弱.膠結充填體抗壓破壞試驗結果顯示,充填體的破壞經歷了四個階段,分別為微裂隙閉合階段、線彈性階段、微裂紋擴展階段及裂紋貫通破壞階段.

     

    Abstract: Full tailings cemented backfills were produced by taking Daye iron ore tailings as a raw material and cement as a cementing material. The relations of the backfills' strength with slurry concentration, sand-to-lime mass ratio and curing period, together with the sensitivity of the backfills' strength to these influencing factors, were studied by using single-factor five-level experiment design. The strength of the backfills follows an exponential function with slurry concentration and curing period, but a linear function with sand-to-lime mass ratio. Moreover, the sensitivity of the backfills' strength to curing period is the highest, but is the weakest to sand-to-lime mass ratio. Compressive failure test results show that destruction of the backfills goes through four stages, including micro-crack closure stage, linear elastic stage, micro-crack propagation stage, and crack coalescence stage.

     

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