冲击载荷下煤样动力学响应特性与损伤本构模型  

Dynamic response characteristics and damage constitutive model of coal samples under impact load

作　　者：杨科[1,2,3] 许日杰 刘帅[1,2,4] 刘文杰 张杰[1,2,3] YANG Ke;XU Rijie;LIU Shuai;LIU Wenjie;ZHANG Jie(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Mining Coal Safety and Efficient Construction by Anhui Province and Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;School of Mining Engineering,Anhui University of Science and Technology,Huainan 232001,China;School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]安徽理工大学矿业工程学院,安徽淮南232001 [4]安徽理工大学安全科学与工程学院,安徽淮南232001

出　　处：《振动与冲击》2024年第9期139-148,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金区域创新发展联合基金(U21A20110)。

摘　　要：为研究深部煤体动载响应规律,采用分离式霍普金森压杆试验系统对信湖矿煤样开展了不同应变率的单轴冲击压缩试验。研究结果表明:冲击载荷下煤样动态抗压强度强度具有明显的应变率效应,且随着应变率增大,应变硬化现象愈发明显;煤样反射能、透射能、吸收能、耗能密度与应变率呈一次函数关系,耗能占比与应变率呈指数型函数关系,且均保持正相关。基于经典朱-王-唐模型、Weibull分布、Drucker-Prager准则,建立了考虑煤样损伤与黏滞性特征的动态统计损伤本构模型,并对本构模型的准确性与普适性进行了验证。该模型能够较好地描述煤样冲击动态力学行为,为动载影响下深地煤炭安全开采提供了基础研究。Here,to study dynamic response law of deep coal body,a split Hopkinson pressure bar(SHPB)test system was used to conduct uniaxial impact compression tests with different strain rates for coal samples of Xinhu Mine.The study results showed that dynamic compressive strength of coal samples under impact load has an obvious strain rate effect,with increase in strain rate,strain hardening phenomena become more obvious;reflection energy,transmission energy,absorption energy and energy-dissipation density of coal samples exhibit linear function relations to strain rate,while proportion of energy-dissipation exhibits an exponential function relation to strain rate,all of them maintain a positive correlation;based on classical Zhu-Wang-Tang model,Weibull distribution and Drucker-Prager criterion,the dynamic statistical damage constitutive model considering coal samples damage and viscosity characteristics is established,and the correctness and universality of this constitutive model are verified;this model can better describe impact dynamic behavior of coal samples to provide a basic study for safe mining of deep coal under dynamic load.

关 键 词：煤 应变率 朱-王-唐模型 动态损伤本构模型 分离式霍普金森压杆 

分 类 号：O382.2[理学—流体力学]