基于细观层次的软硬互层状复合岩体力学特性研究

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摘要以锦屏一级水利工程地下厂房区软硬互层状复合岩体为研究对象，引入基于区域生长算法的图像分割技术，获取材料内部细观非均匀性信息，建立能体现岩体真实细观结构的计算网格。采用三维有限差分软件FLAC，以弹–脆–塑性本构为基础，考虑不同层面倾角的影响，对单轴压缩应力状态下岩样破裂过程进行了细观层次的数值模拟。结果表明：随着层面倾角的改变，应力分布规律与岩体中岩质材料的细观分布密切相关；岩样的渐进破坏过程均是以拉应力破坏为起点，并终止于主剪切带的形成。此外，主软弱层面出现了沿层面“长轴向”及“短轴向”的2种贯通性破坏形式，并与岩样室内试验结果有相似的破裂现象。

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关键词 ：岩石力学, 软硬互层状复合岩体, 数字图像处理, 区域生长算法, 渐进破坏

Abstract：For the soft and hard interbedded composite rock mass of Jinping I underground carves，interior heterogeneity information of meso-level is obtained by the technique of image segmentation based on region growing algorithm. Computational grid to reflect actual meso-structure is established. Then，a finite difference software package FLAC is used to study failure process under uniaxial compression test，considering effect of orientation angle by elasto-brittle-plastic model. The results show that with the change of orientation angle，stress distribution in rock mass is closely related to heterogeneity of rock materials in meso-level. All the fracture propagation process of samples initiates with tensile failure and ends in formation of main shear band. Furthermore，the appearance of failure along the long and short axial directions of soft rock is similar to experimental results in laboratory.

Key words： rock mechanics soft and hard interbedded rock mass digital image processing region growing algorithm fracture propagation

收稿日期: 2013-08-13

引用本文:

李昂1，邵国建1，范华林1，杜培荣2，朱义欢1. 基于细观层次的软硬互层状复合岩体力学特性研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3042-3049.
LI Ang1，SHAO Guojian1，FAN Hualin1，DU Peirong2，ZHU Yihuan1. INVESTIGATION OF MECHANICAL PROPERTIES OF SOFT AND HARD INTERBEDDED COMPOSITE ROCK MASS BASED ON MESO-LEVEL HETEROGENEITY. , 2014, 33(sl): 3042-3049.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3042

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