文献类型：期刊文献

英文题名：Influence of loading system stiffness on failure mode and energy evolution law of coal-rock combination

作者：Li, Zhiyuan Zhao, Guangming Cheng, Xiang Qing, Zhihong Meng, Xiangrui Wu, Xukun

第一作者：Li, Zhiyuan

通信作者：Li, ZY[1]

机构：[1]Anhui Univ Sci & Technol, Key Lab Minist Educ Coal Mine Safety & Efficient M, Huainan 232001, Anhui, Peoples R China;[2]Anhui Univ Sci & Technol, State Key Lab Digital & Intelligent Technol Unmann, Huainan 232001, Anhui, Peoples R China;[3]Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Anhui Univ Sci & Technol, Key Lab Minist Educ Coal Mine Safety & Efficient M, Huainan 232001, Anhui, Peoples R China

通信机构：corresponding author), Anhui Univ Sci & Technol, Huainan 232001, Peoples R China.

年份：2026

卷号：185

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20254919656167);WOS:【SCI-EXPANDED(收录号:WOS:001638729500001)】；

基金：This work was supported by the National Natural Science Foundation of China (52474090, 5237407) , 2024 Excellent Young Teacher Training Funding Project (YQYB2024020) and National Key Research and Development Program of China (2023YFC2907600) .

语种：英文

外文关键词：Rock mechanics; Rockbursts; Dynamical rupture; Coal-rock combination; Loading system stiffness; Energy release and dissipation

摘要：The frequent occurrence of coal-rock dynamic disasters, such as rockbursts, significantly threatens the safety and efficiency of coal resource extraction in deep mines. Understanding the mechanisms of coal-rock dynamic events induced by stiffness effects is fundamental to disaster prevention and control. This study investigated how the mechanical properties of coal-rock combination (CRC) influence the stability of roadway rock mass under different loading stiffness conditions. A series of uniaxial compression tests were conducted on CRC specimens using the self-developed two-dimensional variable-stiffness dynamic failure simulation system and acoustic emission (AE) monitoring equipment. The objective of this study is to discuss the influence of the loading system stiffness (LSS) on the mechanical properties, failure mode, and energy evolution of the CRC. The results revealed that: (1) The deterioration of roof stiffness exacerbated energy release and induced unsteady rock mass failure. The principle of energy release and dissipation was applied to analyze the instability mechanisms of the testing machine and the CRC. The relationship between energy release and dissipation during the CRC failure process under different LSS conditions was clarified. The failure was categorized into three modes: stable failure (U-d > U-m + U-r + U-c), critical state (U-d = U-m + U-r + U-c), and dynamic failure (U-d < U-m + U-r + U-c). (2) As the LSS increased, the post-peak stress-strain curves of the CRC transitioned from a steep drop indicative of dynamic instability to a progressive, stepwise drop that reflects gradual instability. Additionally, the post-peak stress drop rate decreased significantly, while the duration of the failure process was notably prolonged. (3) LSS significantly affected the post-peak energy evolution process of the CRC. LSS facilitated a transformation in energy conversion from a "single release" mode to a multi-stage cyclic mode characterized by "release-accumulation-re-release" by reducing the system's energy storage capacity and suppressing the energy release rate. (4) Stiffness difference was identified as the primary controlling factor in the dynamic instability of CRC. The influence of LSS resulted in energy accumulation and release that triggered premature failure of the coal body. The residual energy in the system was transferred to the rock mass, which led to chain dynamic instability. This process highlights the energy-driven mechanism behind coal-rock dynamic disasters under stiffness effects.