采矿与岩层控制工程学报2024，Vol.6Issue(2)：1-10,10.
基于真三轴卸载试验不同倾角组合煤岩力学特性研究
Mechanical properties of coal and rock with different dip angles based on true triaxial unloading test
摘要
Abstract
To delve into the impact of roof structural plane inclination angles on the mechanical properties of coal and rock during coal extraction,this study employed a bespoke acoustic process simulation testing system for conducting true triaxial loading and unloading tests on combined coal and rock specimens under varying structur-al plane inclination angles,with an acoustic emission detection system for monitoring.Findings indicate that with increasing inclination angles,the specimens'failure strength diminishes and crack development weakens.The failure mode shifts from tensile shear to shear failure,culminating in sliding failure at an inclination angle of 40°.Specimens with an inclination angle under 30° experienced ample plastic deformation,optimizing their load-bearing capacity,whereas those with inclination angles of 30° or more encountered rapid failure upon reaching critical failure thresholds,leading to partial or complete sliding failure.Acoustic emission signals were predomi-nantly observed during the unloading failure phase,with fewer cumulative counts recorded for specimens at high-er inclination angles.At a 40° inclination,sliding failure significantly reduced the maximum ringing count,mar-ginally affecting the cumulative count.These insights provide valuable perspectives on the unloading failure mechanisms triggered by the inclination angle of the roof structural plane,contributing to the advancement of safe mining practices.关键词
组合煤岩/真三轴试验/结构面倾角/声发射Key words
compound coal-rock/true triaxial test/structural plane inclination angle/acoustic emission分类
矿业与冶金引用本文复制引用
彭岩岩,郦亦凡,余虎,韩攀嵘,朱淳,何满潮..基于真三轴卸载试验不同倾角组合煤岩力学特性研究[J].采矿与岩层控制工程学报,2024,6(2):1-10,10.基金项目
国家自然科学基金资助项目(42277154) （42277154）
