›› 2010, Vol. 31 ›› Issue (12): 3991-3996.

• Numerical Analysis • Previous Articles     Next Articles

Determining representative elementary volume of fractured rock mass based on blockiness analysis

XIA Lu, LIU Xiao-fei, YU Qing-chun   

  1. School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2009-12-14 Online:2010-12-10 Published:2010-12-21

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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.

Key words: fractured rock mass, representative elementary volume, rock block, blockiness

CLC Number: 

  • TU 452
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