Influencing analysis of bedding plane location on the dynamic failure characteristics of coal-rock combinations

Authors

ZHENG Jianwei, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China; Deep Mining and Rockburst Research Institute, CCTEG Chinese Institute of Coal Science, Beijing 100013, ChinaFollow
ZHANG Xiufeng, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China
JU Wenjun, CCTEG Coal Mining Research Institute, Beijing 100013, China
WANG Cunwen, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China
HAN Yueyong, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China
LI Guoying, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China
CHEN Yang, Research Center for Rock Burst Control, Shandong Energy Group Co., Ltd., Jinan 250014, China
LI Haitao, Deep Mining and Rockburst Research Institute, CCTEG Chinese Institute of Coal Science, Beijing 100013, China
HAO Jinwei, Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China
LIU Biao, Shaanxi Coal and Chemical Industry Group Co., Ltd., Xi’an 710065, China

Abstract

Objective The bedding plane location significantly impacts the dynamic failure processes and mechanical properties of coal-rock composites, but the specific influence patterns remain unclear. Methods Dynamic mechanical tests were conducted on coal-rock composite specimens with bedding planes located at the top, middle, and bottom using the split Hopkinson pressure bar (SHPB). The investigation focused on the dynamic stress-strain behavior, failure process, energy distribution, and fragmentation characteristics under impact loading conditions. Results and Conclusions The findings indicate that: (1) The dynamic stress-strain behavior of coal-rock composites can be segmented into five distinct stages: near-linear stage, nonlinear dynamic stress-strain stage, elastic modulus reduction stage, macroscopic rupture stage, and stress wave unloading stage. (2) As the bedding plane location transitions from top to bottom, the extent of rock damage increases, the failure process becomes more pronounced, and the uniformity of post-failure fragments decreases. Conversely, the coal component exhibits a reduction in damage severity and an increase in fragment size after failure. (3) The presence of a bedding plane significantly reduces the dynamic compressive strength of coal-rock composites. Compared to composites without a bedding plane (average strength: 79.487 MPa), the dynamic compressive strength decreases by 7.25% (average strength: 73.724 MPa) when the bedding plane is at the top, by 22.26% (average strength: 61.798 MPa) when at the middle, and by 18.24% (average strength: 64.991 MPa) when at the bottom. (4) The energy distribution changes as the bedding plane location shifts from top to bottom, with a reduction in reflected energy, an increase in absorbed energy, and a decrease in transmitted energy. These results provide valuable insights for optimizing fracturing positions in large-scale hard roof treatment using ultra-long hole hydraulic fracturing or surface fracturing techniques.

Keywords

bedding plane location, coal-rock combinations, dynamic mechanical properties, split Hopkinson pressure bar（SHPB）, energy structure, hydraulic fracturing

DOI

10.12363/issn.1001-1986.24.04.0253

Recommended Citation

ZHENG Jianwei, ZHANG Xiufeng, JU Wenjun, et al. (2024) "Influencing analysis of bedding plane location on the dynamic failure characteristics of coal-rock combinations," Coal Geology & Exploration: Vol. 52: Iss. 10, Article 10.
DOI: 10.12363/issn.1001-1986.24.04.0253
Available at: https://cge.researchcommons.org/journal/vol52/iss10/10

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