Next Article in Journal
Micro-Laser-Induced Breakdown Spectroscopy: A Novel Approach Used in the Detection of Six Rare Earths and One Transition Metal
Next Article in Special Issue
An Innovative Method for Placement of Gangue Backfilling Material in Steep Underground Coal Mines
Previous Article in Journal
The Effects of Al2O3 and SiO2 on the Formation Process of Silico-Ferrite of Calcium and Aluminum (SFCA) by Solid-State Reactions
Previous Article in Special Issue
Experimental Investigation of Perceptual Characteristics of Functional Cemented Backfilling Materials in Coal Mines
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Minerals 2019, 9(2), 102; https://doi.org/10.3390/min9020102

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

1
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
3
School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
*
Author to whom correspondence should be addressed.
Received: 2 January 2019 / Revised: 5 February 2019 / Accepted: 7 February 2019 / Published: 11 February 2019
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
Full-Text   |   PDF [13053 KB, uploaded 11 February 2019]   |  

Abstract

Waste-rock material used in underground backfill mining has a granular texture and acquires non-linear deformation characteristics when compressed. The deformation modulus of waste-rock measured by a laboratory compression test is significantly different from the true deformation modulus in the field, due to the complete confining effect of the loading steel cylinder. In this study, we performed a series of laboratory-based compression tests on waste-rock samples. The results showed that lab-acquired deformation modulus variations of waste rock could be divided into three stages: slow increase, accelerated increase, and rapid increase. We also measured the true deformation modulus of backfill waste rock by conducting a field test in gob areas of the Tangshan coal mine, China. The hardening process of backfill waste rock during the field test was analyzed, and could be divided into four stages: roof contact, rapid compression, slow compression, and long-term stable. With the increase of axial strain, the lab- and field-measured deformation moduli of waste rock both increased exponentially. A correction parameter was proposed to investigate the relationship between the field-generated true deformation modulus and the lab-tested deformation modulus. The correction parameter k positively correlated with the axial strain, in the form of an exponential function. The magnitude of k was between 0.5616 and 0.6531. View Full-Text
Keywords: backfill mining; waste-rock material; deformation modulus; compression test; field test backfill mining; waste-rock material; deformation modulus; compression test; field test
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhang, P.; Zhang, Y.; Zhao, T.; Tan, Y.; Yu, F. Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining. Minerals 2019, 9, 102.

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.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top