Filling abandoned mines with fluidized bed combustion ash grout
- West Virginia Univ., Morgantown, WV (United States)
The hydraulic backfilling of abandoned room and pillar coal mines with ash-based grout holds promise as an environmentally beneficial method of ash disposal, capable of preventing acid mine drainage and subsidence. For this scheme to be economically viable, the grout must be sufficiently flowable so that mines can be filled from a small number of boreholes. This paper describes the development and testing of a water-ash-bentonite grout using ash from a coal and gob burning atmospheric pressure fluidized bed combustor. Bentonite was needed to prevent settling which would limit the ability of the grout to spread. Laboratory techniques were devised to measure the rheological parameters of the grout. A static model was developed to predict the maximum distance of spread due to gravity. A field injection of 765 m{sup 3} of grout into an inactive mine panel showed that the grout flows well enough to make hydraulic backfilling feasible.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-94MC29244
- OSTI ID:
- 651167
- Report Number(s):
- CONF-970675-; ISBN 0-8031-2477-5; TRN: IM9826%%123
- Resource Relation:
- Conference: American Society for Testing and Materials (ASTM) symposium on the design and application of CLSM (flowable fill), St. Louis, MO (United States), 19-20 Jun 1997; Other Information: PBD: 1998; Related Information: Is Part Of The design and application of controlled low-strength materials (flowable fill); Howard, A.K.; Hitch, J.L. [eds.]; PB: 351 p.; ASTM special technical publication, 1331
- Country of Publication:
- United States
- Language:
- English
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