岩土力学 ›› 2026, Vol. 47 ›› Issue (7): 2489-2501.doi: 10.16285/j.rsm.2025.0618CSTR: 32223.14.j.rsm.2025.0618

• 数值分析 • 上一篇    下一篇

基于数字图像相关技术和有限-离散元法数值模拟的含孔洞千枚岩变形破坏机制研究

郭莹1, 2，张小波1, 2，曹志松1, 2，易乐1, 2，马永力1, 2，姚池1, 2   

  1. 1．南昌大学 工程建设学院，江西 南昌 330031；2．南昌大学 水工岩土工程安全江西省重点实验室，江西 南昌 330031
  • 收稿日期:2025-06-13 接受日期:2025-10-15 出版日期:2026-07-13 发布日期:2026-07-15
  • 通讯作者: 张小波，男，1989年生，博士，副教授，硕士生导师，主要从事岩石力学与地下工程方面的研究。E-mail: zhangxb@ncu.edu.cn
  • 作者简介:郭莹，女，2001年生，硕士研究生，主要从事隧道（洞）围岩稳定性分析与数值模拟方面的研究。E-mail: gy20010401@163.com
  • 基金资助:
    国家自然科学基金资助项目（No.52579102，No.52369019）；江西省自然科学基金杰出青年基金资助项目（No.20242BAB23047）；赣鄱俊才支持计划-青年科技人才托举项目（No.2023QT06）。

Deformation and failure mechanism of phyllite with a cavity based on digital image correlation technology and finite-discrete element method numerical simulation

GUO Ying1, 2, ZHANG Xiao-bo1, 2, CAO Zhi-song1, 2, YI Le1, 2, MA Yong-li1, 2, YAO Chi1, 2   

  1. 1. School of Infrastructure Engineering, Nanchang University, Nanchang, Jiangxi 330031, China; 2. Jiangxi Provincial Key Laboratory of Hydraulic Geotechnical Engineering Safety, Nanchang University, Nanchang, Jiangxi 330031, China
  • Received:2025-06-13 Accepted:2025-10-15 Online:2026-07-13 Published:2026-07-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52579102, 52369019), the Jiangxi Provincial Natural Science Foundation for Distinguished Young Scholars (20242BAB23047) and the Young Elite Scientists Sponsorship Program by Jiangxi Advanced Science and Technology Talents Program (2023QT06).

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摘要： 在千枚岩地层中的隧洞开挖的围岩应力集中效应与层面力学效应对岩体变形破坏的影响显著，容易引起围岩的非对称变形。为深入理解千枚岩层理倾角对围岩变形破坏的控制作用，研究了0º，30º，45º，60º和90º这5种层理倾角的含孔洞千枚岩试样在压缩条件下的变形特征、应力演化和渐进破坏机制。试验结果表明：含孔洞千枚岩破坏荷载随层理倾角的增大呈U型变化趋势。基于数字图像相关（digital image correlation，简称DIC）技术研究了层理倾角对含孔洞岩样破坏模式的影响：层理倾角为0°时，孔顶与孔底形成高应变集中区，发生张拉破坏；层理倾角为30°～60°时，在孔洞应力集中效应与层面力学效应的共同作用下，应变集中带沿层理扩展，诱发剪切滑移破坏；层理倾角为90°时，应变集中带沿竖直方向延伸，发生沿层理的劈裂张拉型破坏。采用基于内聚力模型的有限-离散元方法研究了含孔洞千枚岩试样的细观破坏机制，基于试验结果验证了该方法在模拟含孔洞层状岩样力学行为的可行性和适用性。双轴加载条件下的数值模拟研究表明，侧压不仅提高了岩样的承载能力，降低各向异性率，同时还使得不同倾角岩样的破坏模式发生转变。

关键词: 千枚岩, 层理倾角, 数字图像相关, 破坏机制, 有限-离散元法

Abstract: During tunnel excavation in phyllite formations, the stress concentration effect in surrounding rock and the mechanical effect of beddings significantly influence the deformation and failure of rock masses, commonly resulting in asymmetric deformation. To investigate the impact of phyllite bedding dip angle on the deformation and failure of surrounding rocks, this study examined the deformation characteristics, stress evolution, and progressive failure mechanisms of cavity-containing phyllite specimens with five bedding dip angles (0°, 30°, 45°, 60°, and 90°) under compression. Experimental results indicate that the failure load of cavity-containing phyllite exhibits a U-shaped trend with increasing bedding dip angle. By adopting the digital image correlation (DIC) technology, the influence of bedding dip angle on the failure mode of cavity-containing specimens was analyzed. At a dip angle of 0° , high strain concentration zones developed at the roof and floor of the cavity, resulting in tensile failure. When the dip angle ranged from 30° to 60°, strain concentration bands propagated along the beddings due to the combined effect of cavity stress concentration and bedding plane mechanics, thereby inducing shear-slip failure. At a dip angle of 90°, strain concentration bands extended vertically, leading to tensile-splitting failure along the beddings. The mesoscopic failure mechanisms of cavity-containing phyllite specimens were studied using the combined finite-discrete element method (FDEM) incorporating the cohesive zone model (CZM). Based on the experimental results, the feasibility and applicability of this modeling method for simulating the mechanical behavior of cavity-containing layered rock specimens were validated. Numerical simulation analyses of biaxial loading tests reveal that confining pressure not only enhances the bearing capacity of the specimens and reduces the anisotropy ratio, but also induces transitions in the failure modes of specimens with varying dip angles.

Key words: phyllite, bedding angle, digital image correlation, failure mechanism, finite-discrete element method

中图分类号: TU 452
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