高应变率下锚固体动态力学特性及能量耗散研究  

Dynamic mechanical properties and energy dissipation of an anchorage body under high strain rate impact

作　　者：张寅 杨晨晨 代连朋 李家俊 周雨 刘家麒 ZHANG Yin;YANG Chenchen;DAI Lianpeng;LI Jiajun;ZHOU Yu;LIU Jiaqi(School of Mechanics&Engineering,Liaoning Technical University,Fuxin 123000,China;Institute of Disaster Rock Mechanics,Liaoning University,Shenyang 110036,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁大学灾害岩体力学研究所,沈阳110036

出　　处：《振动与冲击》2025年第2期11-20,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52174116);国家自然科学基金青年科学基金项目(52304133);辽宁省科技厅博士启动基金(2023-BS-083)。

摘　　要：优化冲击荷载作用下巷道锚固支护参数是提升冲击地压巷道锚固围岩抗冲变形能力的重要方法。为探究锚固支护锚杆直径这一参数对冲击加载下锚固体圈层变形稳定性的提升效能,采用分离式霍普金森压杆试验系统研究不同锚杆直径作用下锚固体的冲击破坏响应,得到不同锚杆直径参数下锚固体的动态应力-应变曲线、主应变云图、动态能量参数和破碎块度分布规律。研究结果表明:高应变率冲击加载下,随着锚杆直径的增加,锚固体动态抗压强度呈先上升后下降的趋势;锚杆延迟了锚固体裂纹萌生、扩展和贯通的过程,加锚试件锚固止裂效率呈先增大后减小的趋势;锚固体透射能量比与破碎耗散能量比呈先下降后上升的趋势,反射能量比呈先上升后下降的趋势,其分形维数与锚杆直径呈二次函数关系,与破碎耗散能密度呈正相关且一次函数关系;锚杆直径对围岩锚固效应的提升存在最优匹配的特点,锚杆直径过大或过小均不利于降低锚固体的冲击破坏程度。研究成果对优化冲击地压巷道锚固支护参数具有指导意义。Optimizing the parameters of roadway anchoring support parameters under impact loads is important for enhancing the impact deformation resistance of anchored surrounding rock bodies of roadways impacted by ground pressure changes.To investigate the effectiveness of varying the anchor diameter on enhancing the deformation stability of an anchorage body under impact loading and the impact damage response of the anchorage body with different anchor diameters,split Hopkinson pressure bar testing was performed to obtain the dynamic stress-strain curves,principal strain contour diagrams,dynamic energy parameters,crushing block size distribution pattern of the anchorage body with different anchor diameters.The results of the study show that:under high strain rate impact loading,with the increase of anchor diameter,the dynamic load compressive strength of the anchorage body shows a trend of first rising and then decreasing;the anchor delays the process of anchorage body crack germination,expansion and penetration,the anchorage stopping efficiency of the anchored specimen shows a trend of first increasing and then decreasing;the ratio of transmitted energy to dissipated energy of the anchorage body shows a first rising and then decreasing trend,and the ratio of reflected energy shows a first decreasing and then increasing trend,and its fractal dimension is a quadratic function of the diameter of the anchor,which is positively and linearly correlated with the density of crushing energy dissipation;between the anchor diameter and the enhancement of the anchoring effect of the surrounding rock there is an optimal matching characteristic,too large or too small anchor diameter is not conducive to reducing the degree of impact breaking of the anchorage body.The research results are of guiding significance for optimizing the anchoring support parameters of impacted ground pressure roadways.

关 键 词：高应变率 锚杆直径 分离式霍普金森压杆 锚固体 能量耗散 分形维数 

分 类 号：TD324[矿业工程—矿井建设]