基于三维离散元仿真试验的复杂节理岩体力学参数尺寸效应及空间各向异性研究

doi:10.13722/j.cnki.jrme.2014.12.007

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摘要复杂节理岩体力学参数研究是岩石力学领域的热点问题。对基于三维离散元仿真试验的复杂节理岩体力学参数尺寸效应及空间各向异性研究方法进行探讨，解决了复杂节理岩体数值仿真试验中的难点问题。结合工程实例，在三维岩体结构模型的基础上详细研究节理岩体力学参数尺寸效应，考虑模型位置的影响，基于室内试验确定结构面法向变形和切向变形本构模型，利用Fish语言编程实现仿真试验中自定义的结构面变形本构模型，得到研究区节理岩体抗压强度折减系数、变形模量折减系数、剪切模量折减系数和体积模量折减系数随模型位置及岩体尺寸的变化规律，确定研究区节理岩体表征单元体尺寸约为18 m。采用模型旋转法，基于仿真试验确定研究区节理岩体表征单元体在三维空间任意45°方向上力学参数，获得研究区节理岩体力学参数的各向异性特征。

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关键词 ：岩石力学, 岩体力学参数, 尺寸效应, 各向异性, 表征单元体, 离散元法, 3DEC

Abstract：Determining the mechanical parameters of jointed rock mass is a critical problem in rock mechanics. The techniques to study the size effect and the spatial anisotropy of the mechanical parameters of jointed rock mass through three-dimensional distinct element simulations were discussed and the methods to solve the problems encountered in the simulation were proposed. The size effect on mechanical parameters of jointed rock mass was investigated on the basis of a three-dimensional fracture network model through a case study by considering the effect of model location. The normal and the shear constitutive models of actual joints were established according to the laboratory test results. These constitutive models were used to represent the mechanical property of joints via a program written with Fish language. The variation of the normalized rock block strength，the deformation modulus，the shear modulus and the bulk modulus with the location and block size were obtained and the representative elementary volume(REV) size was determined to be 18 m. Finally，the anisotropy of jointed rock mass in the studied area was revealed by rotating the REV block size of 18 m in every 45°in 3D to determine the mechanical parameters in different directions.

Key words： rock mechanics rock mass mechanical parameters size effect anisotropy REV distinct element method 3DEC

收稿日期: 2013-11-25

引用本文:

吴琼1，2，唐辉明1，2，王亮清1，2，雷国平3，方堃1，2. 基于三维离散元仿真试验的复杂节理岩体力学参数尺寸效应及空间各向异性研究[J]. 岩石力学与工程学报, 2014, 33(12): 2419-2432.
WU Qiong1，2，TANG Huiming1，2，WANG Liangqing1，2，LEI Guoping3，FANG Kun1，2. THREE-DIMENSIONAL DISTINCT ELEMENT SIMULATION OF SIZE EFFECT AND SPATIAL ANISOTROPY OF MECHANICAL PARAMETERS OF JOINTED ROCK MASS. , 2014, 33(12): 2419-2432.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.12.007 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/I12/2419

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