Affiliation of Author(s):  土木与资源工程学院

Teaching and Research Group:  0201

Journal:  International Journal of minerals, Metallurgy and materials

Funded by:  国家自然科学基金项目

Key Words:  acoustic emission; overburden soil layer; mined-out area; localization damage and deformation

Abstract:  The repetitive mining disturbance imposed on multiple rock of mined-out area under overburden soil layer will result in fatigue damages of rock materials. The rapid concentration and evolution of strain in very narrow areas will turn into strain localization band and finally transform into macro fracture or failure. In this article, localized damage and deformation characteristics of multiple rock of mined-out area under thick soil layer were analyzed by acoustic emission (AE)-based physical similar simulation experiment and damage test combined with AE theory on rock damage. During different mining courses, the degree of wall rock suffered from mining disturbed process in mined-out area was different, so did the AE density of initial damage and fracture. Some characteristic parameters, including large events, total events, and energy rate, present fluctuations with temporal and spatial change and take on certain extent statistic relation. Subsequently, the percent of damage degree is defined and divided into 4 stages, the localization damage and deformation characteristics of surrounding rock of mined-out area and coal pillar are analyzed quantitatively. The study result is very important to provide a necessary direction for mining safety.

First Author:  苗胜军

Volume:  16

Issue:  3

Page Number:  2

Number of Words:  2

ISSN No.:  1674-4799

Translation or Not:  no

CN No.:  11-5787/TF