The main objective of this investigation is to understand the desiccation behaviour of fluid fine tailings (FFT) pre-dewatered with a superabsorbent polymer (SAP) with respect to wetting-drying cycles. Raw FFT (control) and pre-dewatered FFT with SAP were subjected to five cycles of wetting and six cycles of drying. Evaporation was found to be the dominant mechanism in the dewatering of raw FFT, as well as FFT pre-dewatered with SAP. In both cases, the suction developed in each drying cycle was eliminated temporarily by the succeeding wetting cycle. The minimum solids content within the column was found to be around 70%, which corresponded to a vane shear strength of 4.5 kPa. Based on the digital images of the surface, the crack intensity factors of the raw FFT and pre-dewatered FFT were calculated to be 26 and 14%, respectively. Scanning electron microscopy and mercury intrusion porosimetry analyses indicated that the FFT pre-dewatered with SAP after 25 days of evaporation in the second lift exhibited the most compacted texture. The solids content of the FFT pre-dewatered with SAP increased to 98% from an initial 50%. The SAP pre-dewatering method can significantly increase the shear strength of FFT subjected to wetting-drying cycles.
机构:
China Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R ChinaChina Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China
Wen, Baoping
Li, Hui
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机构:
Beijing Geol Engn Corp Ltd, Beijing 100143, Peoples R ChinaChina Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China
Li, Hui
Ji, Boxun
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Beijing Satcom Iot Technol Dev Co Ltd, Beijing 100192, Peoples R ChinaChina Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China
Ji, Boxun
ADVANCING CULTURE OF LIVING WITH LANDSLIDES, VOL 2: ADVANCES IN LANDSLIDE SCIENCE,
2017,
: 447
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453
机构:
Hohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
Bian, Xia
Zhang, Wei
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机构:
Nanjing Yujie Real Estate Dev Co Ltd, Nanjing 211122, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
Zhang, Wei
Li, Xiaozhao
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China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
Li, Xiaozhao
Shi, Xiusong
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Hohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
Shi, Xiusong
Deng, Yongfeng
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Southeast Univ, Sch Transportat, Inst Geotech Engn, Nanjing, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
Deng, Yongfeng
Peng, Jie
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Hohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R ChinaHohai Univ, Key Lab, Minist Educ Geomech & Embankment Engn, Nanjing 210098, Peoples R China
机构:Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
Bai, W.
Zhang, H.
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机构:Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
Zhang, H.
Liu, B.
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机构:Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
Liu, B.
Wu, Y.
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机构:Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
Wu, Y.
Song, J.
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机构:
Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R ChinaChinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China