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Estimation of Deformation Modulus of Rock Mass for an Underground Cavern Based on Back Analysis
The deformation modulus or modulus of deformation of rock mass is one of the important engineering parameter in the design of underground structures especially large caverns for housing turbines in case of hydroelectric projects. The deformation modulus may be estimated indirectly based on the empirical relations available in the literature or may be measured in the field based on the in-situ testing. The commonly performed in-situ tests in the field for measuring the deformation modulus of rock mass are Plate jacking test, Plate loading test and Goodman jack test. The measured in-situ deformation modulus of rock mass by each method varies because of the different techniques and test procedures involved in calculating it. Hence, because of these wide variation in values choosing the correct value of deformation modulus to be considered in the design of underground excavations becomes a challenge.
The displacements predicted based on the in-situ deformation modulus as input parameter in the 3D numerical modelling may not match with that of the measured displacements in the field during excavation of the caverns. An attempt has been made in this paper for arriving at the actual value of the deformation modulus based on the back analysis of the instrumentation data especially the displacements for an underground cavern using 3D numerical modelling studies by FLAC3D software.
Estimation of Deformation Modulus of Rock Mass for an Underground Cavern Based on Back Analysis
The deformation modulus or modulus of deformation of rock mass is one of the important engineering parameter in the design of underground structures especially large caverns for housing turbines in case of hydroelectric projects. The deformation modulus may be estimated indirectly based on the empirical relations available in the literature or may be measured in the field based on the in-situ testing. The commonly performed in-situ tests in the field for measuring the deformation modulus of rock mass are Plate jacking test, Plate loading test and Goodman jack test. The measured in-situ deformation modulus of rock mass by each method varies because of the different techniques and test procedures involved in calculating it. Hence, because of these wide variation in values choosing the correct value of deformation modulus to be considered in the design of underground excavations becomes a challenge.
The displacements predicted based on the in-situ deformation modulus as input parameter in the 3D numerical modelling may not match with that of the measured displacements in the field during excavation of the caverns. An attempt has been made in this paper for arriving at the actual value of the deformation modulus based on the back analysis of the instrumentation data especially the displacements for an underground cavern using 3D numerical modelling studies by FLAC3D software.
Estimation of Deformation Modulus of Rock Mass for an Underground Cavern Based on Back Analysis
Lecture Notes in Civil Engineering
Verma, Amit Kumar (editor) / Mohamad, Edy Tonnizam (editor) / Bhatawdekar, Ramesh Murlidhar (editor) / Raina, Avtar Krishen (editor) / Khandelwal, Manoj (editor) / Armaghani, Danial (editor) / Sarkar, Kripamoy (editor) / Sekar Bellapu, H. V. (author) / Sinha, Rabindra Kumar (author) / Naik, S. R. (author)
International Conference on Geotechnical Challenges in Mining, Tunneling and Underground Infrastructures ; 2021
Proceedings of Geotechnical Challenges in Mining, Tunneling and Underground Infrastructures ; Chapter: 25 ; 393-404
2022-06-04
12 pages
Article/Chapter (Book)
Electronic Resource
English
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