裂隙岩体表征单元体研究进展  

THE ADVANCES IN INVESTIGATION OF REPRESENTATIVE ELEMENTARY VOLUME FOR FRACTURED ROCK MASS

作　　者：向文飞[1] 周创兵[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《岩石力学与工程学报》2005年第A02期5686-5692,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50239070)

摘　　要：裂隙岩体表征单元体(REV)研究是岩体力学的一个基本问题。通过对REV定义的讨论,分析REV的一般力学意义,认为REV是蕴含着“离散与连续”、“微观与宏观”、“随机性与确定性”辨证关系的基本力学概念。阐述裂隙岩体REV与岩体力学模型的选取及力学参数取值的密切关系,指出裂隙岩体REV是选择岩体力学模型的定量标准,集中反映岩体力学性质的尺寸效应。在总结前人研究成果的基础之上,阐述了研究裂隙岩体REV的基本思路,认为基于离散裂隙网络模拟技术的数值分析方法是进行裂隙岩体REV研究的重要手段。最后,利用Monte Carlo方法生成含有两组随机裂隙的二维岩体区域,通过有限元法分析岩体单轴受压情况下的等效弹性模量随岩体尺寸的变化规律,确定所考虑岩体的REV为9 m×9 m。The investigation of the representative elementary volume（REV） of fractured rock mass is a fundamental problem in rock mechanics. Firstly, the general mechanical meaning of REV is discussed by analyzing its definition, and REV is considered as a basic mechanical conception that contains the dialectic relationships of microstructure-macrostructure, discreteness-continuousness, and randomness-determinacy. Then, the close relationship between the REV of fractured rock masses and the choice of mechanical models as well as mechanical parameters is explained. It shows that REV can be regarded as a quantitative criterion for choosing equivalent continuum approach or discrete approach to solve rock engineering problems and it can reflect the size effect of mechanical properties of rock mass. With the summarization of previous studies about REV, the general methodology for investigating the REV of fractured rock mass is presented and the results show that numerical method, based on the modeling techniques of discrete fracture networks, will become a mainstream for estimating the REV of fractured rock masses. Finally, Monte Carlo simulation approach is used to reproduce a two-dimensional rock mass region which contains two sets of random fractures, and the finite element method is adopted to obtain the equivalent elastic modulus of the rock mass under uniaxial loading. According to the variation of equivalent elastic modulus being changed with the size of rock mass, the REV size of the considered. rock mass is estimated to be 9m×9m.

关 键 词：岩石力学 裂隙岩体 表征单元体 力学模型 力学参数 尺寸效应 

分 类 号：TU452[建筑科学—岩土工程]