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Bulletin of Engineering Geology and the Environment

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01-08-2022 | Original Paper

Acoustic emission characteristics and damage evolution process of backfilling body–coal pillar–backfilling body composite structure

Authors: Boqiang Cui, Guorui Feng, Jinwen Bai, Kai Wang, Xudong Shi, Haotian Wu

Published in: Bulletin of Engineering Geology and the Environment | Issue 8/2022

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Abstract

The stability of the backfilling body–coal pillar–backfilling body (BPB) composite structure in coal mines is of great significance for the rock strata control after backfilling along both sides of the coal pillars. Uniaxial compression tests were conducted on different BPB composite samples to explore their acoustic emission (AE) characteristics and damage evolution process. The results show that the strength of the BPB composite samples is lower than that of the backfilling body sample of the same size. When increasing the coal element width, the peak stress of the BPB composite samples gradually decreases, the stress–strain curve changes from a single peak to multiple peaks, and the AE events transition from a uniform distribution to a regional concentrated distribution. The concentrated areas of AE energy during BPB composite sample failure are mainly distributed in the coal elements, and the maximum AE energy values all appear on the coal elements. The reduction of the backfilling body element width in the BPB composite sample reduces its binding force on the coal element. Larger coal element widths are thus associated with poorer sample integrity after uniaxial compression. The study of the AE ringing count clarifies the relationship between the strain and damage variable during uniaxial compression. This study provides an important foundation for understanding the disaster evolution process of BPB composite structures.

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Title: Acoustic emission characteristics and damage evolution process of backfilling body–coal pillar–backfilling body composite structure
Authors: Boqiang Cui
Guorui Feng
Jinwen Bai
Kai Wang
Xudong Shi
Haotian Wu
Publication date: 01-08-2022
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 8/2022
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-022-02779-9

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