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Realistic Parameters Adoption to Solve Rock Engineering Problems

  • T. Ramamurthy
Original Paper
  • 15 Downloads

Abstract

Strength and modulus of rock mass as obtained from RMR, Q and GSI have been examined with reference to modulus ratio, Mrj, for their reliability. The design parameters adopted in some case studies based on these rock mass classifications are presented. The modulus ratios in these case studies are found to be much higher than those of the corresponding values of intact rocks, even after back analyses. Based on joint factor, Jf, compressive strength, modulus, cohesion and friction angle were estimated and applied in the analyses of a few cases. The predictions of deformations agreed well with the field measurements. Based on extensive experimental data of jointed specimens of rock and rock-like materials, a joint factor, Jf, was defined as a weakness coefficient in rock mass compared to the corresponding intact rock. Jf is linked to the strength, modulus and modulus ratio of rock mass. The modulus ratio, Mrj, of rocks is less than the modulus ratio of intact rock. The Mrj concept has been adopted to present a unified classification for intact rocks and rocks masses, to define soil that rock boundary and penetration rate of TBMs.

Keywords

Case studies Classifications Equivalent continuum model Joint factor Modulus ratio Numerical modeling Penetration rate of TBMs Properties Rock mass Soil–rock boundary 

Notes

Acknowledgements

Authors thank the IGS Executive Committee for offering the opportunity to present this Sixth Terzaghi Oration, M/S Ferro co for initiating and supporting this Oration activity, the local chapter of IGS at Indore for making arrangements, Prof. Seetharam and Prof. Madhavi Latha promoting our researching findings in predicting the performance of rocks, my research scholars who guided research in characterizing the rock mass, and also my colleagues for establishing a healthy environment at IIT Delhi for nurturing Rock Mechanics activity.

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Copyright information

© Indian Geotechnical Society 2018

Authors and Affiliations

  1. 1.Angron Geotech Pvt. LtdNew DelhiIndia

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