准脆性岩石断裂问题的准键有限元法
作者:
作者单位:

(1.河海大学岩土力学与堤坝工程教育部重点实验室,江苏 南京210098;2.核工业北京地质研究院国家原子能机构高放废物地质处置创新中心,北京100029 )

作者简介:

朱其志(1979—),男,教授,博士,主要从事多尺度岩石力学本构理论与工程应用研究。E-mail:qizhi_zhu@163.com

中图分类号:

TU45


Quasi-bond finite element method for fracture problem of quasi-brittle rocks
Author:
Affiliation:

(1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;2.CAEA Innovation Center on Geological Disposal of High Level Radioactive Waste, Beijing Research Institute of Uranium Geology, Beijing 100029, China )

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    摘要:

    为解决全域准键方法( QBM)结构分析计算和内存开销较大的问题,将QBM与有限元法(FEM)相结合,提出新的准键有限元法(QBFEM)。QBFEM采用统一的线性单元进行空间离散,将初始裂隙区和潜在损伤区设置为准键区域,进行连续-不连续数值分析,在材料无损区域采用有限元分析,且过渡区无需设置耦合区域。利用QBM和QBFEM对不同数量级网格结构进行刚度矩阵组装运算,验证了QBFEM的数值高效性和计算准确性。单孔平板拉伸、预制单裂缝平板剪切和静水压力下无损重力坝分析表明,QBFEM能够准确捕捉固体材料I型裂缝的萌生与扩展。

    Abstract:

    Given the fact that computational effort and memory requirements are considerable when applying the quasi-bond method (QBM) to structural analyses, this paper introduces a hybrid numerical method combining QBM and the classical finite element method for modeling and simulating deformation and crack evolution in quasi-brittle materials. The proposed approach, referred to as QBFEM, utilizes linear elements for spatial discretization of structures. Cracked material regions and potential damage zones are designated as quasi-bond analysis domains where continuous-discontinuous solutions are performed, while non-damaged zones are solved using the finite element method without involving any coupling regions along the QBM-FEM transition zones. Subsequently, several tests of stiffness matrix assembling by both QBM and QBFEM for different meshes were conducted to demonstrate the efficiency of QBFEM. Finally, three numerical examples-plate with a single hole under tension, single crack plate under shear, and undamaged gravity dam under hydrostatic pressure-are provided for validation, which demonstrate that QBFEM can effectively capture the initiation and propagation of Mode I fracture in solid materials.

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朱其志,刘武,赵星光,等.准脆性岩石断裂问题的准键有限元法[J].河海大学学报(自然科学版),2025,53(2):78-87, 106.(ZHU Qizhi, LIU Wu, ZHAO Xingguang, et al. Quasi-bond finite element method for fracture problem of quasi-brittle rocks[J]. Journal of Hohai University (Natural Sciences),2025,53(2):78-87, 106.(in Chinese))

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  • 收稿日期:2024-09-18
  • 在线发布日期: 2025-03-26