Next Article in Journal
Bin2Vec: A Better Wafer Bin Map Coloring Scheme for Comprehensible Visualization and Effective Bad Wafer Classification
Previous Article in Journal
A Web Service for Evaluating the Level of Speech in Korean
Article Menu

Export Article

Open AccessArticle
Appl. Sci. 2019, 9(3), 596; https://doi.org/10.3390/app9030596

Experimental Study on Mechanical Properties, Energy Dissipation Characteristics and Acoustic Emission Parameters of Compression Failure of Sandstone Specimens Containing En Echelon Flaws

1,2,* , 1,2
,
1,2
,
1,2
and
1,2
1
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2
College of Resources and Environmental Sciences, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Received: 3 January 2019 / Revised: 1 February 2019 / Accepted: 5 February 2019 / Published: 11 February 2019
(This article belongs to the Section Applied Physics)
Full-Text   |   PDF [8548 KB, uploaded 12 February 2019]   |  
  |   Review Reports

Abstract

To further understand the fracture behavior of rock materials containing en echelon flaws and determine precursor information for the final collapse of damaged mineral assemblies under compression, a series of uniaxial compression experiments using a loading system, an acoustic emission system and a video camera was conducted on sandstone specimens containing en echelon flaws. The mechanical properties, energy dissipation characteristics and acoustic emission parameters of compression failure of selected specimens were successively analyzed. The results showed that crack initiation was accompanied by a stress drop, step-like characteristics on the energy consumption curve and increased crackling noises, which were used as early warning signals before the final collapse happened. In addition, we used the histogram statistics method and maximum likelihood method to analyze the distribution of acoustic emission energy and determined that the acoustic emission energy distributions of sandstone specimens containing en echelon flaws followed a power law. With the progress of the experiment, the optimum exponents changed in different stages and gradually decreased as failure was approached, which could also be used as an early warning signal before the final collapse happened. This paper may provide some theoretical basis for monitoring and warning about the collapse and instability of engineering rock masses containing en echelon flaws. View Full-Text
Keywords: en echelon flaws; stress drop; energy dissipation; acoustic emission; power law distributions en echelon flaws; stress drop; energy dissipation; acoustic emission; power law distributions
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, D.; Li, S.; Bai, X.; Yang, Y.; Chu, Y. Experimental Study on Mechanical Properties, Energy Dissipation Characteristics and Acoustic Emission Parameters of Compression Failure of Sandstone Specimens Containing En Echelon Flaws. Appl. Sci. 2019, 9, 596.

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]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top