Next Article in Journal
Effect of Crystal Chemistry Properties on the Distribution Characteristics of H2O and Na+ in Na-Montmorillonite Interlayer Space: Molecular Dynamics Simulation Study
Previous Article in Journal
XRD Identification of Ore Minerals during Cruises: Refinement of Extraction Procedure with Sodium Acetate Buffer
Open AccessArticle

The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core

by Yu-ye Tan 1,2,*, Kai Zhang 1,2,*, Xin Yu 1,2, Wei-dong Song 1,2, Jie Wang 1,2 and Cheng-long Hai 1,2
1
Key Laboratory of High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Ministry of Education of China, Beijing 100083, China
2
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(2), 159; https://doi.org/10.3390/min10020159
Received: 31 December 2019 / Revised: 6 February 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Practical Solutions for Underground Mine Backfilling Systems)
In underground metal mines that use sublevel or stage open-stope and backfilling mining methods (SSOBMMs), there is a special structure around which both sides of the rock pillar are wrapped by backfill. As a permanent part of an underground mine, how much can backfill improve the rock pillar’s compressive strength? What is the difference in the mechanical properties between the special structure and the signal rock? To explore these questions, a composite structure made of a cement-tailing backfill (CTB) and rock core (RC) was designed. Uniaxial and triaxial compressive strength tests and scanning electron microscope (SEM) were used to research the mechanical properties, failure process, failure characteristics, and microstructure characteristics of the cement-tailing backfill and rock core (CTB-RC) specimens. It was found that the full stress–strain curve of the CTB-RC specimen under triaxial compressive strength (TCS) test had two times the stress increases reaching a lower peak deviator stress two times after the RC was destroyed. The CTB can reduce the destruction and slow down the deformation speed of the inner rock cor (IRC). It can also prevent rigid slip of the IRC after it is damaged and maintain the stability and integrity of the overall structure. The findings of this study can provide some basic knowledge on the mechanical properties of the CTB-RB and provide theoretical guidance for the optimization direction of the width of the rock pillar and the room in mines using SSOBMMs.
Keywords: cement-tailing backfill (CTB); rock core (RC); composites structure; mechanical properties; microstructural cement-tailing backfill (CTB); rock core (RC); composites structure; mechanical properties; microstructural
MDPI and ACS Style

Tan, Y.-Y.; Zhang, K.; Yu, X.; Song, W.-D.; Wang, J.; Hai, C.-L. The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core. Minerals 2020, 10, 159.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop