Rock Mass Classification Using Electrical Resistivity - an Analytical Study

2006 ◽  
Vol 321-323 ◽  
pp. 1411-1414 ◽  
Author(s):  
Jun Su Choi ◽  
Hee Hwan Ryu ◽  
In Mo Lee ◽  
Gye Chun Cho
Keyword(s):  
Electrical Resistivity ◽  
Rock Mass ◽  
Analytical Study ◽  
Rock Strength ◽  
Rock Mass Classification ◽  
Electrical Characteristics ◽  
Joint Spacing ◽  
Mass Classification ◽  
Theoretical Analyses ◽  
Q System

Geophysical prospecting using electrical resistivity is one of the principal methods for subsurface exploration. However, the majority of such application methods are restricted to coarse descriptions of underground conditions. The Q-system is commonly used as a representative rock mass classification system in modern rock engineering. In this paper, electrical resistivity is related to the Q-system through theoretical analyses. The analyses are based on Coulomb's law and Gauss' law considering electrical characteristics of constituent parameters for rock mass classification such as joint thickness, joint condition, joint spacing, intact rock strength, and RQD. The results show that there is a strong correlation between electrical resistivity and rock mass classification.

scholarly journals Some New Correlations of Q-Value with Rock Mechanics Parameters in Underground Oil Storage Caverns

2017 ◽  
Vol 3 (8) ◽  
pp. 537-546 ◽  
Author(s):  
Fang Lin ◽  
Hebing Luan ◽  
Yanhua Zeng ◽  
Zhibin Zhong
Keyword(s):  
Rock Mass ◽  
Rock Mechanics ◽  
Rock Mass Classification ◽  
Underground Storage ◽  
Preliminary Evaluation ◽  
Oil Storage ◽  
Geological Conditions ◽  
Mass Classification ◽  
Q System ◽  
Q Values

Q-system is a preferred alternative method of rock mass classification for underground oil storage caverns where stable lithological rocks are widely distributed. In this paper, correspondences between important input rock mechanics parameters (friction angle, cohesion, tensile strength, Poisson’s ratio, deformation modulus) and Q values were investigated, thereby bringing convenient to rapidly obtain available parameters when it’s hard to collect measured field data in underground storage projects basically with similar lithology. The proposed correlations were verified through numerical simulation and on-site monitoring measurement. In addition, comparison of different criteria among Q-system and other codes for rock mass classification has been made to help for making a preliminary evaluation of rock mass quality in the practical engineering. Finally, the behaviours of surrounding rock deformations under different Q values were analysed by using FLAC3D code with the calculating parameters suggested in this paper, and the calculation results match well with measured values in situ. Above results will not only guide the construction but also could be relevant to other underground storage engineering under similar geological conditions.

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