A Numerical Study of the Effect of Wick Drains Applied in Mine Stopes with Paste Fill
Paste fill is popularly used in underground mines.A large amount of water is added into fills to facilitate their pipe transportation.Upon placement,the self-weight consolidation in paste fill can lead to the generation of excess pore-water pressures.To avoid excess pressures applied on the retaining structure,filling is usually staged with an undesirable curing interval.Recent numerical analyses conducted by the authors indicated that pre-installing wick drains in backfilled stopes can accelerate the consolidation,and thus enable continuous filling.In previous analyses,however,a zero pressure head was imposed along the wick drains and the effect of third dimension was ignored.These tend to overestimate the fills consolidation.In this paper,more representative numerical models are performed with GeoStudio,with the threedimensional drainage around a wick drain converted to an equivalent planestrain condition.Moreover,the fill permeability in the drift is reduced,compared to that in the stope,to mimic the restricted flow via the drawpoint.The results show that the consolidation of paste fill depends largely on the wick drain layout(spacing).The effect of wick drain size is also evaluated.
Paste fill Wick drains Modeling Consolidation
Pengyu Yang Li Li Gengshe Yang
Xian University of Science and Technology,Xian 710054,China Polytechnique Montreal,Montreal H3C 3A7,Canada
国际会议
The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)
杭州
英文
227-233
2018-10-28（万方平台首次上网日期，不代表论文的发表时间）