基于四维离散数值方法的岩石圆环试样动态破坏及耗能规律
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TU457

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国家自然科学基金(11772221);中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金(SKLGDUEK1706)


Dynamic failure and energy dissipation of rock ring specimen based on 4D lattice spring model
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    摘要:

    利用最新提出的四维离散弹簧元法(4D-LSM)对岩石圆环的动态抗变形及耗能特性进行研究。首先对4D-LSM用于描述岩石圆环试样破坏的适用性进行了验证,发现4D-LSM可以较好地再现岩石试样的孔径比与破坏形态和强度间的影响规律。在此基础上,对孔隙率、非均质性、厚径比等因素与抗变形及耗能间的规律进行研究,得到了对应的数学公式。利用4D-LSM模拟大变形方面的优势,发现当岩石材料的变形抵抗能力较大时,岩石圆环将表现出与传统仅考虑小变形情况下实验和数值计算不同的破坏形态,岩石圆环的材料抗拉强度与抗变形能力也分别呈现非线性关系。通过建立圆环阵列模型,研究了由多个岩环构成的组合结构的抗变形和能量抵抗能力以及对应的破坏形态。结果表明,组合结构中的圆环单元与单圆环受力的破裂形态有所不同,但单圆环的抗变形及耗能规律仍适用于岩环阵列结构的分析。

    Abstract:

    In this work, the deformation resistance and energy dissipation of rock rings were investigated by using the 4D lattice spring model (4D-LSM). Firstly, the 4D-LSM was verified against existing experimental and numerical simulation results in terms of the influence of rock ring size on the failure pattern and strength. On this basis, empirical relationships of the influence of various factors, e.g. the porosity, heterogeneity, and thickness-diameter ratio, on the deformation resistance and energy dissipation of the rock ring were derived from numerical tests with the 4D-LSM. When considering the large deformation, it was found that the failure pattern of the rock ring would be different from the classical experimental and numerical observations. Moreover, different empirical relationships between the deformation resistance and energy dissipation as well as the material ultimate deformation were derived compared to these numerical tests considering small deformation only. Finally, the failure pattern, deformation resistance and energy dissipation of a composed structure made up from an array of rock rings were studied. Numerical results reveal that these relationships obtained for the single rock ring are also applicable to the composed structure.

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张奔,赵高峰.基于四维离散数值方法的岩石圆环试样动态破坏及耗能规律[J].土木与环境工程学报(中英文),2019,41(2):20-28. Zhang Ben, Zhao Gaofeng. Dynamic failure and energy dissipation of rock ring specimen based on 4D lattice spring model[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2019,41(2):20-28.10.11835/j. issn.2096-6717.2019.025

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  • 收稿日期:2018-05-25
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  • 在线发布日期: 2019-04-30
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