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Title: Laboratory Characterization of Cemented Rock Fill for Underhand Cut and Fill Method of Mining
Authors: Kumar D.
Singh U.K.
Singh G.S.P.
Published in: Journal of The Institution of Engineers (India): Series D
Abstract: Backfilling with controlled specifications is employed for improved ground support and pillar recovery in underground metalliferous mine workings. This paper reports the results of a laboratory study to characterise various mechanical properties of cemented rock fill (CRF) formulations for different compaction levels and cement content percentage for use in underhand cut and fill method of mining. Laboratory test set ups and procedures have been described for conducting compressive and bending tests of CRF block samples. A three dimensional numerical modelling study has also been carried out to overcome the limitations arising due to non-standard dimension of test blocks used in flexural loading test and the test setup devised for this purpose. Based on these studies, specific relations have been established between the compressive and the flexural properties of the CRF. The flexural strength of the wire mesh reinforced CRF is also correlated with its residual strength and the Young’s modulus of elasticity under flexural loading condition. The test results of flexural strength, residual flexural strength and modulus show almost linear relations with cement content in CRF. The compressive strength of the CRF block samples is estimated as seven times the flexural strength whereas the compressive modulus is four times the flexural modulus. It has been found that the strengths of CRF of low compaction and no compaction are 75 and 60 % respectively to that of the medium compaction CRF. The relation between the strength and the unit weight of CRF as obtained in this study is significantly important for design and quality control of CRF during its large scale application in underhand cut and fill stopes. © 2015, The Institution of Engineers (India).
Citation: Journal of The Institution of Engineers (India): Series D (2016), 97(2): 193-203
Issue Date: 2016
Publisher: Springer India
Keywords: Cemented rock fill (CRF)
Compressive strength
Degrees of compaction
Flexural strength
Metalliferous mine
Underhand cut and fill
Wire reinforcement
ISSN: 22502122
Author Scopus IDs: 57202478211
Author Affiliations: Kumar, D., Department of Mining Engineering, Indian School of Mines, Dhanbad, 826004, India
Singh, U.K., Department of Mining Engineering, Indian School of Mines, Dhanbad, 826004, India
Singh, G.S.P., Department of Mining Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India
Corresponding Author: Singh, G.S.P.; Department of Mining Engineering, Indian Institute of Technology (BHU)India; email:
Appears in Collections:Journal Publications [ME]

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