考虑应变率和层理倾角的炭质板岩动力学特性及本构模型  

Dynamic characteristics and constitutive model of carbonaceous slate consider-ing strain rate and bedding inclination angle

作　　者：胡涛涛 李禹 高咸超 HU Taotao;LI Yu;GAO Xianchao(School of Highway,Chang′an University,Xi′an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《山东大学学报（工学版）》2024年第5期122-131,共10页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(52378388);陕西省自然科学基础研究计划资助项目(2022JM-203);长安大学中央高校基本科研业务费专项资金资助项目(300102213211)。

摘　　要：为研究应变率和层理倾角对炭质板岩动力学特性的影响并建立其本构模型,基于分离式霍普金森压杆试验系统,对不同应变率和层理倾角的炭质板岩试样进行动态压缩试验,并分析其应力-应变曲线及破裂形态。在朱-王-唐模型的基础上,综合考虑层理倾角和应变率以及岩石损伤的影响,建立适用于炭质板岩的动态损伤本构模型,利用本构模型对试验数据进行拟合。结果表明:随着应变率的增大,试样的动态峰值强度与峰值应变均增大;随着层理倾角的增大,试样峰值强度呈现先减小后增大的趋势,应变峰值则是先增大后减小;本构模型拟合曲线与试验曲线一致性良好,从而证明该模型的正确性与适用性。To investigate the effect of strain rate and bedding inclination on the dynamic mechanical properties of carbonaceous slate and establish its constitutive model,this study conducted dynamic compression tests on carbonaceous slate specimens of different strain rates and bedding inclination using a Hopkinson pressure bar test system,and analyzed their stress-strain curves and failure modes.Based on the Zhu-Wang-Tang model,this study established a dynamic damage constitutive model suitable for carbonaceous slate by considering the influence of bedding inclination,strain rate,and rock damage,and fitted the experimental data using the constitutive model.The results showed that with the increase of strain rate,the dynamic peak strength and peak strain of the sample increased.With the increase of bedding inclination,the peak strength of the sample showed a trend of first decreasing and then increasing,and the peak strain first increased and then decreased.The fitting curve of the constitutive model showed good consistency with the experimental curve.

关 键 词：动力学特性 破裂形态 本构模型 应变率 层理倾角 

分 类 号：TU452[建筑科学—岩土工程]