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Minerals 2018, 8(8), 322; https://doi.org/10.3390/min8080322

Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill

1
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China
2
School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China
3
GeoEnergy Research Centre, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK
*
Author to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 10 July 2018 / Accepted: 25 July 2018 / Published: 27 July 2018
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Abstract

It is of great significance, for economic, environmental and security reasons, to investigate the strength characteristic of underground cemented paste backfill (CPB). Consequently, an ultrasonic test, uniaxial and triaxial compression experiment, and acoustic emission (AE) monitoring were carried out on CPB, for which the particles satisfied Talbot gradation. The homogeneity of CPB specimens was evaluated by ultrasonic pulse velocity (UPV). The stress–strain behavior and AE characteristic of CPB specimens under different Talbot indices and confining pressures were investigated. The effects of the particle size distribution and the confining pressure on the peak strength of CPB were analyzed. The strength parameter model of CPB under the coupled influence of the particle size distribution and the confining pressure was constructed based on the Mohr–Coulomb strength criterion. The results show that the peak strength of CPB is positively linear with confining pressure, however, the relationship between its strength parameters and the Talbot index can be characterized by a quadratic polynomial function. This suggests that there is an optimal gradation of particles reflected in the maximum strength of CPB. View Full-Text
Keywords: cemented paste backfill; gradation; strength; stress–strain cemented paste backfill; gradation; strength; stress–strain
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Wu, J.; Feng, M.; Chen, Z.; Mao, X.; Han, G.; Wang, Y. Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill. Minerals 2018, 8, 322.

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