冲击荷载下复合岩体动力响应力学特性及本构模型研究

doi:10.13722/j.cnki.jrme.2022.0523

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摘要为研究工程中冲击作用下不同复合岩体的动力响应差异，采用分离式霍普金森压杆(SHPB)试验系统和数字图像相关系统(DIC)，对煤–岩和岩–煤2种复合岩体进行不同应变率下的动态冲击试验，对比动力冲击后2种复合岩体的应力波传播特征、动态强度、能量耗散、破碎分形特征以及破坏模式。并建立考虑复合煤–岩特性的本构模型。试验和理论分析结果表明：在相同应变率条件下，2种复合岩体的入射能基本一致，由于应力波传播过程中冲击杆与岩–煤的波阻抗匹配优于煤–岩体，在应变率较小时岩–煤体的动态强度、耗散能明显大于煤–岩体，随着应变率的增加二者差别逐渐减小；复合岩体耗散能越大其破碎块度分形维数越大，表现出明显的线性相关；不同复合岩体在冲击作用下的破坏主要集中在煤体侧，且以劈裂破坏为主，受界面效应的影响，煤体侧裂纹会发育至岩体侧，从而发生贯通破坏。基于元件组合建立考虑应变率效应和损伤演化的本构模型，其结果与试验结果吻合较好，验证了构建模型的正确性。

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	赵洪宝
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关键词 ：岩石力学, 复合岩体, 分离式霍普金森压杆, 数字图像相关系统, 动力响应, 本构模型

Abstract：In order to explore the difference of dynamic response for different composite rock masses under impact loading in engineering，dynamic impact tests under different strain rates are carried out with split Hopkinson pressure bar(SHPB) test system and digital image correlation(DIC) on coal-rock and rock-coal composite rock masses. The properties of two composite rock masses after impact loading are compared including stress wave propagation，dynamic strength，energy dissipation，fracture fractal characteristics and failure modes. Furthermore，a constitutive model is constructed considering the characteristics of composite coal and rock. The results of experiment and theoretical analysis show that incident energies of two kinds of composite rock masses are almost the same under the same strain rate，dynamic strength properties and dissipation of rock-coal can be significantly greater than that of coal-rock especially when the strain rate is small，this is because wave impedance matching of rock-coal is better in the process of stress wave propagation，and the difference decreases with the increase of strain rate. The larger the dissipative energy of composite rock mass is，the larger the fractal dimension of fragmentation is，and there is an obvious linear correlation between dissipative energy and fractal dimension. Splitting failure is dominant on the coal side of different composite rock masses under impact loading，and then ultimate macroscopical failure will occur due to influence of interface effect with the development of the cracks on the coal side. A constitutive equation considering strain rate effect and damage evolution is established based on the element combination，it is in good agreement with the experimental results，which verifies the correctness of the constructed model.

Key words： rock mechanics composite rock split Hopkinson pressure bar(SHPB) digital image correlation(DIC) dynamic response constitutive model

引用本文:

赵洪宝，吉东亮，刘绍强，程辉，吴桐. 冲击荷载下复合岩体动力响应力学特性及本构模型研究[J]. 岩石力学与工程学报, 2023, 42(1): 88-99.
ZHAO Hongbao，JI Dongliang，LIU Shaoqiang，CHENG Hui，WU Tong. Study on dynamic response and constitutive model of composite rock under impact loading. , 2023, 42(1): 88-99.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0523 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I1/88

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