刘锦;李峰辉;刘秀秀;
LIU Jin;LI Feng-hui;LIU Xiu-xiu;Urban Railway Engineering Department, Shaanxi Railway Institute;Zhengzhou Communications Planning Survey & Design Institute;Qufu Far East Vocational and Technical College;

• 1:陕西铁路工程职业技术学院城轨工程学院
• 2:郑州市交通规划勘察设计研究院
• 3:曲阜远东职业技术学院

摘要(Abstract)：

为研究煤岩的动态破坏特征和动力损伤特性,首先对煤岩试样进行了SHPB冲击压缩试验,分析了煤岩动态破坏的具体特征,然后在ANSYS/LS-DYNA平台上基于HJC材料模型进行了煤岩SHPB数值试验,对比试验实测值与数值模拟值,通过反演的方式确定了煤岩HJC材料模型的主要参数;最后基于HJC模型,通过数值模拟试验研究了煤岩动态破坏特征和损伤演化过程。研究表明:煤岩的动态破坏为多裂纹破坏,随着冲击速度的增加,煤岩的破碎程度显著增加,并表现出明显的应变硬化特性;HJC模型可以较好地描述煤岩的动态力学特性,只需要少量试验数据就可以通过数值试验反演出HJC模型的关键参数,在工程上简单易行;根据模拟试验的结果发现,煤岩的动态损伤主要发生在应力-应变曲线的卸载段,且损伤主要集中在岩石内部,随着冲击速度的增加,动态损伤越发严重。
In order to study the dynamic failure characteristics and dynamic damage characteristics of coal-rock, the SHPB impact compression test is carried out on the coal-rock samples, and the specific characteristics of the dynamic failure of coal-rock are analyzed. Then the SHPB numerical tests of coal-rock are simulated by HJC model. The main parameters of the HJC model of coal-rock are inversed by comparing the measured values with the numerical simulation values. Finally, the dynamic failure characteristics and damage evolution process of coal-rock are studied by numerical simulation test. The results show that the dynamic failure of coal-rock is multi-crack failure, and with the increase of impact velocity, the fracture degree of coal-rock increases significantly, and it shows obvious strain hardening characteristics. The HJC model can well describe the dynamic mechanical properties of coal-rock, and the key parameters of HJC model can be inversed by numerical test, which is simple and feasible in engineering. It is assumed that coal-rock microelements will be destroyed only when they are subjected to excessive tensile stress and excessive deformation. According to the results of simulation tests, it is found that the dynamic damage of coal-rock mainly occurs in the unloading section of the stress-strain curve, and the damage is mainly concentrated in the rock interior, and the dynamic damage becomes more and more serious with the increase of the impact velocity.

关键词(KeyWords)： 分离式霍普金森压杆;冲击荷载;岩石动态破坏;HJC模型;数值试验
split Hopkinson pressure bar;impact load;dynamic rock failure;HJC model;numerical test

Abstract:

Keywords:

基金项目(Foundation): 陕西铁路工程职业技术学院2020年首批科研基金资助项目(KY2020-27)

作者(Authors): 刘锦;李峰辉;刘秀秀;
LIU Jin;LI Feng-hui;LIU Xiu-xiu;Urban Railway Engineering Department, Shaanxi Railway Institute;Zhengzhou Communications Planning Survey & Design Institute;Qufu Far East Vocational and Technical College;

DOI: 10.19931/j.EB.20200159

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