Medium-Term Strength and Electromagnetic Radiation Characteristics of Cemented Tailings Backfill Under Uniaxial Compression
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It is important to grasp the medium-term mechanical properties of cemented tailings backfilling (CTB) for the structural parameter design. The CTB samples with the cement to tailings (c/t) ratio of 1:4, the slurry mass of 70 and 75%, respectively. The uniaxial compressive tests were carried out on the CTB samples of curing time of 56 and 90 days respectively by SANS servo and CTA-1 acoustic–electric dynamic data acquisition system. The experimental results show that: (1) the CTB samples are accompanied with the electromagnetic radiation signal release during the loading process. The stress of the CTB samples are almost linearly distributed before the peak compressive strength. After the peak strength, the uniaxial stress decreases rapidly with the increase of the loading time, and the specimens of CTB rapidly damage; (2) during the loading process, the pulse count and energy of the electromagnetic pulse show the initial calming stage, the first active stage, the second calm stage before the peak strength, second active and the calming stage with the increase of the loading time, showing “calm-active-calm-active-calm”. The accumulated pulse count and cumulative energy increase with the loading time, and gradually stabilize after the second active stage. And the results may provide a beneficial inference for researches on production mechanism and forecast of the fugitive disaster of CTB.
KeywordsCemented tailings backfill (CTB) Medium-term strength Pulse counts Evolution law
The author desire to communicate their thankfulness to the National Key R&D Program of China (2017YFC0602900) and Fundamental Research Funds for the Central Universities (FRF-TP-17-075A1) for financial support. We also thank Miss Ruiwen Ma and Group Song for their participation in test program. Special thanks are extend to two anonymous reviewers for their constructive and helpful comments that significantly improved the quality of the manuscript.
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