基于细观层次的软硬互层状复合岩体力学特性研究
发布时间：2019-01-24 16:08
【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。
[Abstract]:Taking the soft and hard interlayered composite rock mass in the underground powerhouse area of Jinping first class water conservancy project as the research object, the image segmentation technology based on the region growth algorithm is introduced to obtain the mesoscopic non-uniformity information within the material. A computational grid which can reflect the real mesoscopic structure of rock mass is established. Based on the elastic-brittle plastic constitutive model and considering the influence of different plane inclination, the fracture process of rock samples under uniaxial compression stress was simulated by using three-dimensional finite difference software (FLAC,). The results show that the stress distribution law is closely related to the meso-distribution of rock materials with the change of plane inclination angle, and the progressive failure process of rock samples starts with tensile stress failure and ends in the formation of the main shear zone. In addition, there are two kinds of penetrating failure forms along the "long axis" and "short axis" of the main weak plane, which are similar to the results of the laboratory test of rock samples.
【作者单位】： 河海大学工程力学系;华北水利水电大学工程力学系;
【基金】：国家自然科学基金资助项目(50978083,11002048)
【分类号】：TU452
本文编号：2414613
[Abstract]:Taking the soft and hard interlayered composite rock mass in the underground powerhouse area of Jinping first class water conservancy project as the research object, the image segmentation technology based on the region growth algorithm is introduced to obtain the mesoscopic non-uniformity information within the material. A computational grid which can reflect the real mesoscopic structure of rock mass is established. Based on the elastic-brittle plastic constitutive model and considering the influence of different plane inclination, the fracture process of rock samples under uniaxial compression stress was simulated by using three-dimensional finite difference software (FLAC,). The results show that the stress distribution law is closely related to the meso-distribution of rock materials with the change of plane inclination angle, and the progressive failure process of rock samples starts with tensile stress failure and ends in the formation of the main shear zone. In addition, there are two kinds of penetrating failure forms along the "long axis" and "short axis" of the main weak plane, which are similar to the results of the laboratory test of rock samples.
【作者单位】： 河海大学工程力学系;华北水利水电大学工程力学系;
【基金】：国家自然科学基金资助项目(50978083,11002048)
【分类号】：TU452
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