基于细观组分实际分布的花岗岩宏细观参数关系

doi:10.13722/j.cnki.jrme.2014.1448

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摘要岩石通常由不同细观组分组成，细观组分的类型与相互作用决定了岩石的宏观力学性质。以北山花岗岩为例，使用室内试验视频和阈值分割技术确定细观组分的类别与位置，将细观组分颗粒和胶结物分别用圆盘和平行黏结来表征，细观力学性质使用颗粒力学性质参数(弹性模量、刚度比、摩擦因数)和平行黏结力学性质参数(弹性模量、刚度比、法向强度均值、切向强度均值)7个指标来表征，宏观力学性质使用弹性模量、泊松比、峰值应力3个指标来表征，使用颗粒流代码、像素和颗粒循环技术，建立考虑细观组分实际分布的颗粒流模型，进行7因素、4水平的32次正交数值模拟试验，研究宏细观力学性质关系和细观力学性质参数的调整方法。结果表明，数字图像处理技术可以有效用于建立基于细观组分实际分布的颗粒流模型；宏观弹性模量–细观弹性模量、宏观泊松比–细观刚度比、宏观峰值应力–细观强度具有很好的对应关系；宏细观弹性模量、泊松比、刚度比有较好的相关关系。由于细观组分的实际分布与力学特点控制了岩石的变形破坏过程，研究成果对估计岩石细观力学参数、预测宏观力学性状具有一定的参考价值。

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	徐金明1
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关键词 ：岩石力学, 花岗岩, 实际分布, 颗粒流模型, 宏细观参数关系

Abstract：Rock is generally composed of various meso-compositions. The type and interaction between these compositions may affect the macro mechanical properties. Taking the Beishan granite as an example，the video images photographed during the laboratory test and the threshold segmentation technique were used to determine the actual types and locations of the various compositions. The particles and cements of the compositions were then assumed as disks and parallel bonds in simulation. The meso-scale mechanical properties were characterized with seven parameters，including the elasticity modulus，stiffness ratio and frictional coefficient of the particles，and the elasticity modulus，stiffness ratio，average normal and tangential strengths of parallel bonds. Macro-scale mechanical properties were characterized with three parameters，including the elasticity modulus，Poisson's ratio，and peak stress of the specimen. The particle flow code and the pixel and particle loops were combined to establish the particle flow model based on the actual compositions. Thirty-two orthogonal simulation tests were then conducted using the seven meso-mechanical parameters in a four level. The macro-meso mechanical relations and the adjustment method in calibrating the meso-mechanical parameters were thereafter proposed. It shows that the digital image processing techniques may be efficiently used to develop a particle flow model reflecting the actual distributions of the multi-compositions；there are good agreements between the elasticity modulus-modulus，Poisson's ratio-stiffness ratio，and peak stress-strength respectively in the macro- and meso-scales. A good correlation exists in the elasticity modulus-stiffness ratio-Poisson's ratio in the macro- and meso-scales. Because the distributions and mechanical features of the meso-compositions control the deformation/failure process，the results presented herein may provide references both in determining the meso-parameters and in estimating the macro parameters of rock materials.

Key words： rock mechanics granite actual distribution particle flow model relation between macro-meso parameters

引用本文:

徐金明1，黄大勇1，2，朱洪昌1. 基于细观组分实际分布的花岗岩宏细观参数关系[J]. 岩石力学与工程学报, 2016, 35(S1): 2635-2643.
XU Jinming1，HUANG Dayong1，2，ZHU Hongchang1. Relations between macro- and meso-scopic mechanical parameters of granite based on actual distributions of mesocompositions. , 2016, 35(S1): 2635-2643.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1448 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2635

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