长江科学院院报 ›› 2022, Vol. 39 ›› Issue (2): 129-134.DOI: 10.11988/ckyyb.20201114

• 岩土工程 • 上一篇    下一篇

层状岩体损伤破坏特征数值模拟

白琦, 代恒军   

  1. 中冶南方城市建设工程技术有限公司,武汉 430000
  • 收稿日期:2020-11-01 修回日期:2021-06-03 出版日期:2022-02-01 发布日期:2022-02-11
  • 作者简介:白 琦(1993-),男,甘肃会宁人,工程师,硕士,主要从事地下空间岩土设计与研究工作。E-mail:1050393574@qq.com

Numerical Simulation on Characteristics of Damage and Failure of Layered Rock Mass

BAI Qi, DAI Heng-jun   

  1. WISDRI Urban Design and Construction Company, Wuhan 430000, China
  • Received:2020-11-01 Revised:2021-06-03 Online:2022-02-01 Published:2022-02-11

摘要: 为更深入了解层状岩体的力学特性,首先基于细观损伤力学理论,运用体积平均化的方法,推导了微裂纹对岩体弹性柔度矩阵的贡献;然后基于不可逆热力学框架,导出了损伤矢量的损伤破坏方程;最后建立了层状岩体的损伤破坏本构模型,并通过数值计算模拟了层状岩体的损伤破坏特征,与室内试验结果吻合较好。巴西圆盘劈裂数值试验研究表明:岩体试样的破裂面均从加载点起裂;层理倾角0°、90°时,破裂面为通过加载中心和试样中心的近似平面,层理倾角为其他角度时,破裂面为偏离了加载中心的曲面。与室内试验结果对比可知,本文二次开发的本构模型能够较好地预测层状岩体渐进破坏的各向异性。

关键词: 微裂纹, 损伤破坏, 本构模型, 层状岩体, 巴西圆盘劈裂试验

Abstract: To further understand the mechanical properties of layered rock mass, the contribution of microcracks to the elastic flexibility matrix of rock mass was deduced by using the volume averaging method based on the theory of microscopic damage mechanics; subsequently, the damage evolution equation with damage vector was derived based on the irreversible thermodynamic framework; finally, the damage evolution constitutive model of layered rock mass was established, and the applicability of the constitutive model was verified by comparing the results of numerical calculation with laboratory test. The results of Brazilian disc splitting test manifest that the fracture surface of rock mass samples starts from the loading point. When the bedding dip angle is 0° and 90°, the fracture surface is the approximate plane passing through the loading center and the sample center; otherwise the fracture surface is the curved surface deviating from the loading center. Comparison with laboratory test results verified that the constitutive model developed in this paper could well predict the anisotropic characteristics of progressive failure of layered rock mass.

Key words: microcrack, damage evolution, constitutive model, layered rock mass, Brazilian disc splitting test

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