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Minerals 2018, 8(9), 407; https://doi.org/10.3390/min8090407

Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

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
Nottingham Centre for Geomechanics, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK
4
School of Civil Engineering, Xuzhou Institute of Technology, Xuzhou 221018, China
*
Author to whom correspondence should be addressed.
Received: 2 August 2018 / Revised: 25 August 2018 / Accepted: 11 September 2018 / Published: 14 September 2018
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Abstract

It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented rockfill material for which the particles satisfied the Talbot gradation. Uniaxial and triaxial compression experiments were carried out on the cemented rockfill specimen, which obtained the relations between the mechanical parameters (Poisson ratio, elastic modulus, compressive strength, cohesive force, internal friction angle, and tensile strength) and the particle size distribution of the aggregate. The excavation and filling processes in the coal seam were simulated based on the numerical software FLAC3D. The characteristics of the displacement and stress fields of the strata when the goaf was filled by cemented rockfill with different granule gradations were discussed. The influences of the particle size distribution and mining distance on the maximum subsidence displacement of the coal seam roof, internal stress of the backfill, and the stress of the rock mass in the coalface were analyzed. The feasibility and effectiveness of the filling mining with cemented rockfill to protect the integrity of the overlying strata were discussed. The results showed that optimizing the particle size distribution of the aggregate in cemented rockfill could increase the loading capacity of the backfill to improve the filling effect, effectively control the strata movement, and decrease the stress of rock mass in the coalface to reduce the potential danger. View Full-Text
Keywords: cemented rockfill; particle size distribution; strata movement; filling mining; numerical simulation cemented rockfill; particle size distribution; strata movement; filling mining; numerical simulation
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Wu, J.; Feng, M.; Xu, J.; Qiu, P.; Wang, Y.; Han, G. Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining. Minerals 2018, 8, 407.

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