中北大学学报（自然科学版）2025，Vol.46Issue(2)：197-207,11.DOI:10.62756/jnuc.issn.1673-3193.2024.04.0021
高温对煤的动态拉伸力学性能的影响
Effect of High Temperature on Dynamic Tensile Mechanical Properties of Coal
摘要
Abstract
The mining of deep coal mines is often adversely affected by high temperature geothermal and blasting shocks.In order to ensure safe production and improve mining efficiency,it is very important to study the influence of temperature on the dynamic mechanical properties of coal.In this study,split Hop-kinson bar(SHPB)system was used to carry out Brazilian splitting test of coal samples,and combined with X-ray diffraction(XRD)and particle flow program(PFC)simulation,the mechanical properties and failure evolution process of coal at different temperatures and loading rates were studied,and its microcrys-tal structure and fracture mode were analyzed.The test results show that the high temperature leads to the deterioration of coal,and the tensile strength and dissipative energy of coal samples decrease with the increase of temperature.The tensile strength,incident energy and dissipated energy increase with the increase of impact velocity,and the rate dependence of coal samples decreases after heat treatment.Heat-ing reduces the interlayer spacing of coal and increases the stacking height,which is characterized by the development of high-order coal.Heat treatment enhances the order of the crystal structure of coal,but the microcrystal size is small.Micropores and cracks caused by uneven water evaporation and thermal expan-sion play a greater role in weakening the strength.When PFC simulates the dynamic tensile process of coal samples,the main crack along the loading direction is tensile splitting,the type of fracture in the wedge-shaped region at both ends is mainly compression-shear failure,and the number of tensile cracks is much more than that of shear cracks.关键词
高温劣化/煤热解/动态拉伸/能量耗散/分离式霍普金森杆Key words
high temperature degradation/coal pyrolysis/dynamic tension/energy dissipation/split Hop-kinson bar分类
矿业与冶金引用本文复制引用
袁琪,韩文梅,郑翔,赵鹏..高温对煤的动态拉伸力学性能的影响[J].中北大学学报（自然科学版）,2025,46(2):197-207,11.基金项目
煤与煤层气共采国家重点实验室基金(2022KF10) （2022KF10）
