- Title
- Failure response characteristics and mechanism of coal-backfilling structures in single pillar-side backfilling
- Creator
- Cui, Boqiang; Bai, Jinwen; Feng, Guorui; Wang, Shanyong; Wang, Kai; Shi, Xudong; Guo, Jun; Yang, Xinyu; Song, Cheng
- Relation
- Journal of Central South University (Science and Technology) Vol. 54, Issue 6, p. 2431-2446
- Publisher Link
- http://dx.doi.org/10.11817/j.issn.1672-7207.2023.06.030
- Publisher
- Zhongnan Daxue,Central South University
- Resource Type
- journal article
- Date
- 2023
- Description
- The aim of the study is to explore the failure response characteristics of the "backfilling body-coal pillar" cooperative bearing structure(BP coal-backfilling structure) in the pillar-side backfilling. Firstly, six groups of uniaxial compression tests were carried out for different types of BP coal-backfilling structure samples, the three-dimensional optical speckle monitor and acoustic emission system were used to capture the surface deformation information and sample fracture signal. Secondly, the damage model of BP coal-backfilling structure was constructed based on the acoustic emission characteristics. Finally, the failure mechanism of BP coal-backfilling structure under uniaxial compression was revealed. The results show that with the increase of coal volume ratios, the bearing capacity of BP coal-backfilling structure samples gradually decreases, the elastic modulus firstly decreases and then increases, and the peak strain firstly increases and then decreases. During the uniaxial loading process of BP coal-backfilling structure samples, the strain concentration zone appears earliest at the interface position, then appears in the element with the larger volume ratio, and the appearance relatively lags behind in the element with a small volume ratio. In addition, the maximum acoustic emission energy value occurs in element with large volume ratio. The BP coal-backfilling structure samples experience a gradual damage process, which mainly includes the initial damage stage, the damage development stage and the damage attenuation stage. The larger the volume ratio of coal elements, the faster the damage value of the BP coal-backfilling structure samples increases, and the more likely the sudden instability is to be caused. On the contrary, the damage rate of BP coal-backfilling structure samples can be slowed down by increasing volume ratio of the backfilling body element. The failure of the BP coal-backfilling structure sample is firstly induced by the shear failure or tensile failure of coal-backfilling interface, then, the coal element or the backfilling body element suffers the linkage failure, resulting in the loss of overall bearing capacity of BP coal-backfilling structure samples, and the eventual destabilization is caused.
- Subject
- single pillar-side backfilling; coal-backfilling structure; uniaxial compressive loading; failure response; instability mechanism
- Identifier
- http://hdl.handle.net/1959.13/1491879
- Identifier
- uon:53178
- Identifier
- ISSN:1672-7207
- Language
- Chinese
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