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One-Dimensional Consolidation of Sedimented Stowed Pond Ash

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Abstract

Use of fly ash locked in the ash ponds in geotechnical applications such as stowing or backfilling of the mines is an attractive alternative to solve the disposal problem. Before it is used as a stowing or backfilling material, the response of the fly ash to imposed load must be determined in order to assess its load taking ability. The present study examines the effect of time and incremental load on the consolidation characteristics of the sedimented stowed pond ash using a fixed ring consolidometer. The important parameters, viz. rate of settlement, consolidation coefficients and void ratio, etc. of the hydraulically stowed pond ash collected after 7, 14, 21, 28 and 35 days of stowing under step incremental loads are determined. The study revealed that 60.42–84.87% settlement of the sedimented stowed pond ash takes place in the initial 1 min of the loading. In addition, it is observed that the coefficient of consolidation of the sedimented stowed pond ash, which varies in the range of 0.0195–0.1882 cm2/min, is comparatively low and decreases with the increment of applied load and time. This indicates that the structures lying above the stowed pond ash mass will undergo gradual settling and not suffer large deformation.

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Acknowledgments

The present study is based on the R&D project sponsored by TIFAC, New Delhi, an autonomous wing of the Department of Science and Technology (DST), India. The authors wish to express their gratitude both to TIFAC for financial support and the authority of Talcher Thermal Power Station of NTPC, India for supplying the pond ash to carry out the experiments. The Central Research Facility Centre of IIT, Kharagpur is also gratefully acknowledged for providing the necessary facilities for conducting the XRD and SEM analysis.

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Authors and Affiliations

  1. Department of Mining Engineering, Indian School of Mines, Dhanbad, 826 004, Jharkhand, India

    Devi Prasad Mishra

  2. Department of Mining Engineering, Indian Institute of Technology, Kharagpur, 721 302, West Bengal, India

    Samir Kumar Das

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  1. Devi Prasad Mishra
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  2. Samir Kumar Das
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Correspondence to Devi Prasad Mishra.

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Mishra, D.P., Das, S.K. One-Dimensional Consolidation of Sedimented Stowed Pond Ash. Geotech Geol Eng 30, 685–695 (2012). https://doi.org/10.1007/s10706-011-9486-x

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