Experimental study of the shrinkage behavior of cemented paste backfill  

作　　者：Jiahao Qin Jian Zheng Li Li 

机构地区：[1]Research Institute on Mines and the Environment(RIME UQAT-Polytechnique),Department of Civil,Geological and Mining Engineering,École Polytechnique de Montréal,Montréal,Québec,H3C 3A7,Canada

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2021年第3期545-554,共10页岩石力学与岩土工程学报（英文版）

基　　金：The authors would like to acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada(Grant No.NSERC 402318);Fonds de recherche du Québec-Nature et Technologies(Grant No.FRQNT 2015-MI-191676);Mitacs Elevate Postdoctoral Fellowship(Grant No.IT12573);industrial partners of the Research Institute on Mines and the Environment(RIME UQAT-Polytechnique).

摘　　要：Cemented paste backfill(CPB)is largely used in underground mine stopes worldwide.When a CPB is placed in a stope,an important task is to estimate the settlement associated with the shrinkage and selfweight consolidation of the CPB.This is closely related to the volume management to ensure the stability of barricades and tight contacts between the backfill and stope roof.Over the years,shrinkage studies were mostly performed on fine-grained soils(silts and clays),with only a few publications on the shrinkage behavior of uncemented tailings.No study has been published on the shrinkage behavior of CPB.To fill this gap,a series of shrinkage tests has been conducted on CPB with different cement contents,including zero cement content(uncemented paste backfill,uCPB).The results show that the shrinkage response of CPB is very different from that of uCPB.At a given initial water content,CPB exhibits a shorter normal shrinkage stage than uCPB.The unsaturation onset water content and void ratio,shrinkage limit and final void ratio of CPB are generally higher than those of uCPB.At a given cement content,the shrinkage behaviors of CPB and uCPB are significantly influenced by the initial water content.

关 键 词：Cemented paste backfill(CPB) SHRINKAGE EVAPORATION Underground mine stopes Volume variation 

分 类 号：TD803[矿业工程—矿山开采]