Study of scale effect of deformation modulus of fractured rock mass — partⅠ: Finite element method

YANG Jian-ping; CHEN Wei-zhong; DAI Yong-hao

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Study of scale effect of deformation modulus of fractured rock mass — partⅠ: Finite element method

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- Study of scale effect of deformation modulus of fractured rock mass — partⅠ: Finite element method
- Vol. 32, Issue 5, (2011)
- 作者机构：
  
  中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU45
- Online First：23 September 2011，
  
  Published：2011
- 稿件说明：
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YANG Jian-ping, CHEN Wei-zhong, DAI Yong-hao. Study of scale effect of deformation modulus of fractured rock mass — partⅠ: Finite element method[J]. 2011, 32(5).
DOI：

YANG Jian-ping, CHEN Wei-zhong, DAI Yong-hao. Study of scale effect of deformation modulus of fractured rock mass — partⅠ: Finite element method[J]. 2011, 32(5). DOI：

摘要

通过对裂隙交叉和非贯通裂隙进行的网格剖分研究，建立了随机裂隙岩体网格生成方法，并编制了裂隙岩体有限元网格自动生成程序。根据锦屏电站辅助洞白山组大理岩裂隙分布调查结果，用蒙特卡洛法生成随机裂隙网络，进行了岩石-裂隙二元岩体网格自动剖分，将试验室获得的岩石和裂隙的力学参数分别赋予岩体模型中的岩石和裂隙，通过有限元方法研究了裂隙岩体等效变形模量的尺寸效应和各向异性。尺寸效应研究结果表明，所研究的裂隙岩体的等效变形模量表征单元体REV为8 m；各向异性研究结果表明，在REV尺寸下，所研究的裂隙岩体各个方向变形模量可以通过柔度张量进行拟合，且张量拟合误差不超过8%

Abstract

In order to study the elastic properties of rock mass using the finite element method (FEM) approach

a reasonable rock mass meshing method is proposed

especially the way in dealing with fracture intersections and end regions; and a Fortran program is developed to generate mesh of rock mass automatically. Based on field investigation results of fracture distribution in Jinping hydropower station

a random fracture network is generated by Monte Carlo method; and the mesh of the generated fractured rock mass is created automatically by the Fortran program. Using the parameters obtained by laboratory tests on rock blocks and artificial fractures

a series of numerical simulations of mechanical deformation of the fractured rock mass at different scales and directions are conducted based on the established FEM model. The results show that the REV of deformation modulus of the rock mass is 8 m. Furthermore

the elastic compliance tensor of the fractured rock mass at REV is studied

and error of the tensor characteristic evaluation is less than 8%

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Related Institution

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

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