Microscopic acoustic emission simulation and fracture mechanism of cemented tailings backfill based on moment tensor theory

•A mesoscopic AE simulation method for CTB was established.•The main reason for CTB fracture is the sliding friction between particles.•Micro-tensile crack is dominant, and explosion is the main AE source of CTB.•The micro fracture type of CTB mainly depends on the force acting on the particles. As...

Full description

Saved in:
Bibliographic Details
Published inConstruction & building materials Vol. 308; p. 125069
Main Authors Cheng, Aiping, Shu, Pengfei, Deng, Daiqiang, Zhou, Chengsong, Huang, Shibing, Ye, Zuyang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.11.2021
Subjects
CTB
Fracture mechanism
Moment tensor
Particle flow code
CTB
Fracture mechanism
AE
Particle flow code
Moment tensor
Online AccessGet full text

Cover

More Information
Summary:•A mesoscopic AE simulation method for CTB was established.•The main reason for CTB fracture is the sliding friction between particles.•Micro-tensile crack is dominant, and explosion is the main AE source of CTB.•The micro fracture type of CTB mainly depends on the force acting on the particles. As an artificial pillar, the cemented tailings backfill (CTB) is not destroyed in a short time. It is of great significance to understand the fracture mechanism of CTB for mine backfilling design. Based on laboratory tests and moment tensor theory, the micro-structure parameters of CTB are calibrated, the acoustic emission (AE) simulation method of CTB on micro-scale is established, and the temporal and spatial evolution process and mechanism of CTB fracture under uniaxial compression are studied. The results show that: 1) The fracture of CTB is mainly caused by sliding friction between particles based on the analysis of the relationship between the parameters of AE events. 2) In the process of CTB uniaxial compression simulation, the fracture types of AE sources can be divided into three types: explosion, shear and implosion. Explosion events are dominant in quantity and energy release, followed by shear events and implosion events. 3) The fracture type of AE sources is determined by the force acting on the particles determines the fracture mechanism instead of the ratio between the number of micro-tensile and micro-shear cracks. The research results can provide theoretical guidance for the stability control of CTB.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2021.125069