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Modulus Ratio and Joint Factor Concepts to Predict Rock Mass Response
- Source :
- IndraStra Global.
- Publication Year :
- 2017
-
Abstract
- The commonly adopted rock mass classifications, namely RMR, Q and GSI, are used to estimate compressive strength and modulus of rock masses. These values have been examined as per modulus ratio concept, M (rj) , for their reliability. The design parameters adopted in some of the recent case studies based on these classifications indicate that the M (rj) values for rock masses are higher than those of the corresponding intact rocks. The joint factor, J (f), which is defined as a weakness coefficient in rock mass suggests that modulus ratio of rock mass (M (rj) ) has to be less than the modulus ratio of the corresponding intact rock (M (ri) ), on the basis of extensive experimental evidence. With joint factor, compressive strength, elastic modulus, cohesion and friction angle were estimated and applied in the analyses of a few cases. The predictions of deformations with this approach agreed well with the field measurements by adapting equivalent continuum approach. The modulus ratio concept is considered to present a unified classification for intact rocks and rock masses. Soil-rock boundary, standup time in under ground excavations and also penetration rate of TBM estimates have been linked to M (rj) .
- Subjects :
- 0211 other engineering and technologies
Aggregate modulus
Modulus
Geology
02 engineering and technology
010502 geochemistry & geophysics
Geotechnical Engineering and Engineering Geology
01 natural sciences
Civil Engineering
Compressive strength
Friction angle
Cohesion (geology)
Geotechnical engineering
Geological Strength Index
Rock mass classification
Elastic modulus
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Civil and Structural Engineering
Subjects
Details
- Language :
- English
- ISSN :
- 23813652
- Database :
- OpenAIRE
- Journal :
- IndraStra Global
- Accession number :
- edsair.doi.dedup.....1a89ce183c4a3e9629490100a1d3f625