| 基于块体化程度确定裂隙岩体表征单元体 |
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| 引用本文： | 夏露,刘晓非,于青春.基于块体化程度确定裂隙岩体表征单元体[J].岩土力学,2010,31(12):3991-3996. |
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| 作者姓名： | 夏露 刘晓非 于青春 |
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| 作者单位： | 中国地质大学(北京)水资源与环境学院,北京,100083 |
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| 基金项目： | 国家自然科学基金资助项目（No. 40372134，No. 40772208）。 |
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| 摘 要： | 表征单元体（REV，或典型单元体）的存在是应用连续介质方法研究岩体问题的前提，因此，裂隙岩体表征单元体研究是岩体力学及岩体水力学中的一个基础问题，表征单元体的存在与否可以从不同物理参数的角度进行分析。从岩体块体化程度的角度对其存在性进行了较系统的分析，把岩体中由裂隙圈闭形成的孤立块体的总体积在岩体中所占体积百分比定义为裂隙岩体的块体化程度。介绍了GeneralBlock软件的基本分析过程，利用软件建立了三维裂隙岩体模型。根据国际岩石力学学会的裂隙分级，针对5个延展性级别、7个间距级别建立了35种岩体结构模型。利用GeneralBlock对这35种岩体进行了块体识别，分别讨论了这35种岩体结构的块体化程度随着模型范围变化的波动情况。由于所建立的岩体结构模型是随机的，对每种结构的每个研究范围进行了5次随机实现。结果表明，对所有的35种岩体，表征单元体的尺寸在4～8倍间距之间，不超过8倍间距。
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| 关 键 词： | 裂隙岩体 表征单元体 岩石块体 块体化程度 |
| 收稿时间： | 2009-12-14 |
Determining representative elementary volume of fractured rock mass based on blockiness analysis |
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| XIA Lu,LIU Xiao-fei,YU Qing-chun.Determining representative elementary volume of fractured rock mass based on blockiness analysis[J].Rock and Soil Mechanics,2010,31(12):3991-3996. |
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| Authors: | XIA Lu LIU Xiao-fei YU Qing-chun |
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| Institution: | School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | The existence of the representative elementary volume (REV) is the premise of continuous-media method to study in rock mechanics; therefore the investigation of the REV of fractured rock mass is a fundamental problem in rock mechanics. Whether the REV occurs could be viewed from different physical parameters. However, the existence of REV is analyzed in term of blockiness, which is defined as the percentage of the volume of isolated blocks formed by fractures in the total rock volume. The basic analysis process of GeneralBlock software is presented and a three-dimensional fracture model is set up by this software. Thirty-five kinds of rock mass structural models are established considering the 5 types of persistence and 7 kinds of spacing, which were suggested in the fracture classification of ISRM. For each of the 35 structures, rock blocks are identified by GeneralBlock; and the fluctuation of blockiness with the variance of the scale of model region is investigated. For each structure, the calculation is realized 5 times at random respectively in a specific range of model to reduce the influence of randomness. The results show that the size of representative elementary volume of fractured rock mass is between 4 and 8 times of the fracture spacing; for all of the 35 structures, no more than 8 times. |
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| Keywords: | fractured rock mass representative elementary volume rock block blockiness |
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