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Energies 2017, 10(10), 1592; doi:10.3390/en10101592

Mechanical Characteristics of Superhigh-Water Content Material Concretion and Its Application in Longwall Backfilling

1
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
The Jiangsu Laboratory of Mining-Induced Seismicity Monitoring, China University of Mining & Technology, Xuzhou 221116, China
3
Key Laboratory of Deep Coal Resource Mining, China University of Mining & Technology, Xuzhou 221116, China
4
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China
5
Jizhong Energy Handan Mining Industry Group, Handan 056002, China
6
School of Mining Engineering, University of New South Wales, Sydney, NSW 2052, Australia
7
School of Mines, Guizhou Institute of Technology, Guiyang 550003, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vijay Kumar Thakur
Received: 19 September 2017 / Revised: 1 October 2017 / Accepted: 9 October 2017 / Published: 13 October 2017
(This article belongs to the Section Energy Sources)
View Full-Text   |   Download PDF [7353 KB, uploaded 13 October 2017]   |  

Abstract

Superhigh-water content material (SCM) has been widely utilized for goaf backfilling, grouting, and fire prevention and extinguishing. In this paper, the engineering mechanical characteristics of superhigh-water content material concretion (SCMC) were studied for two types of backfilling technologies in longwall mining—open-type and pocket-type backfilling. The mechanical properties and responses of the SCMC were assessed under different cementation states, varying loading conditions and at different scales. The results indicate that: (1) the compressive and tensile strengths of SCMC specimens in different cementation states increase as the curing time increases—the SCMC formed by a mixture of SCM and gangues has higher strength than that of pure SCM; (2) the SCMC is under different loading and confinement conditions when different backfilling technologies is applied; however the strength of SCMC increases with curing time and decreases with water volume percentage; and (3) large-size specimens of pure SCMC enter into an accelerated creep state at a leveled load of 1.4 MPa. The effects of SCM backfilling on subsidence control has been verified by field applications. The results presented in this paper can provide data support for the optimization of backfill mining technology using SCM, as well as for the design of hydraulic supports parameters at longwall faces. View Full-Text
Keywords: superhigh-water content material; engineering mechanical properties; cementation state; confined compression; scales effect superhigh-water content material; engineering mechanical properties; cementation state; confined compression; scales effect
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MDPI and ACS Style

Wang, X.; Qin, D.; Zhang, D.; Sun, C.; Zhang, C.; Xu, M.; Li, B. Mechanical Characteristics of Superhigh-Water Content Material Concretion and Its Application in Longwall Backfilling. Energies 2017, 10, 1592.

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