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

Xufeng Wang, Dongdong Qin, Dongsheng Zhang, Chundong Sun, Chengguo Zhang, Mengtang Xu and Bo Li
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Xufeng Wang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Dongdong Qin: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Dongsheng Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Chundong Sun: Jizhong Energy Handan Mining Industry Group, Handan 056002, China
Chengguo Zhang: School of Mining Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Mengtang Xu: School of Mines, Guizhou Institute of Technology, Guiyang 550003, China
Bo Li: School of Mines, China University of Mining & Technology, Xuzhou 221116, China

Energies, 2017, vol. 10, issue 10, 1-15

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.

Keywords: superhigh-water content material; engineering mechanical properties; cementation state; confined compression; scales effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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