Abstract
Accurate determination of in situ rock mass design parameters such as deformation modulus is an essential element of the design of underground openings. The first objective of this research was to numerically simulate the extra large flat jack (ELFJ) test. In conventional flat jack testing, the large flat jack (LFJ) coefficients proposed by LNEC Corporation are used to calculate the rock modulus. This leads to erroneous results when using other types of flat jacks. A precise 3D numerical model of a real flat jack test condition was constructed and the ELFJ coefficients were computed numerically as a function of important test parameters. The second objective of the work was to apply the 3D numerical findings to the flat jack field tests conducted at the Bakhtiyari Dam site project, Iran. These tests were aimed at determining the in situ rock mass deformation modulus to be used in the design of the dam structure and underground openings associated with the Bakhtiyari Dam. The dam left abutment and associated test gallery were simulated according to valley topography and actual test gallery dimensions. The objective was to model the problem boundary condition as close to reality as possible. The analysis results showed that the rock mass modulus under the expected abutment loading levels is about 13 GPa.
| Original language | English |
|---|---|
| Pages (from-to) | 452-466 |
| Number of pages | 15 |
| Journal | Geotechnical Testing Journal |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 1 2017 |
| Externally published | Yes |
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Keywords
- 3D modelling
- Bakhtiyari dam
- Extra large flat jack (ELFJ)
- Flat jack testing
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
Cite this
Numerical investigation of extra large flat jack testing of bakhtiyari dam project. / Mortazavi, A.; Saati, V.
In: Geotechnical Testing Journal, Vol. 40, No. 3, 01.05.2017, p. 452-466.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Numerical investigation of extra large flat jack testing of bakhtiyari dam project
AU - Mortazavi, A.
AU - Saati, V.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Accurate determination of in situ rock mass design parameters such as deformation modulus is an essential element of the design of underground openings. The first objective of this research was to numerically simulate the extra large flat jack (ELFJ) test. In conventional flat jack testing, the large flat jack (LFJ) coefficients proposed by LNEC Corporation are used to calculate the rock modulus. This leads to erroneous results when using other types of flat jacks. A precise 3D numerical model of a real flat jack test condition was constructed and the ELFJ coefficients were computed numerically as a function of important test parameters. The second objective of the work was to apply the 3D numerical findings to the flat jack field tests conducted at the Bakhtiyari Dam site project, Iran. These tests were aimed at determining the in situ rock mass deformation modulus to be used in the design of the dam structure and underground openings associated with the Bakhtiyari Dam. The dam left abutment and associated test gallery were simulated according to valley topography and actual test gallery dimensions. The objective was to model the problem boundary condition as close to reality as possible. The analysis results showed that the rock mass modulus under the expected abutment loading levels is about 13 GPa.
AB - Accurate determination of in situ rock mass design parameters such as deformation modulus is an essential element of the design of underground openings. The first objective of this research was to numerically simulate the extra large flat jack (ELFJ) test. In conventional flat jack testing, the large flat jack (LFJ) coefficients proposed by LNEC Corporation are used to calculate the rock modulus. This leads to erroneous results when using other types of flat jacks. A precise 3D numerical model of a real flat jack test condition was constructed and the ELFJ coefficients were computed numerically as a function of important test parameters. The second objective of the work was to apply the 3D numerical findings to the flat jack field tests conducted at the Bakhtiyari Dam site project, Iran. These tests were aimed at determining the in situ rock mass deformation modulus to be used in the design of the dam structure and underground openings associated with the Bakhtiyari Dam. The dam left abutment and associated test gallery were simulated according to valley topography and actual test gallery dimensions. The objective was to model the problem boundary condition as close to reality as possible. The analysis results showed that the rock mass modulus under the expected abutment loading levels is about 13 GPa.
KW - 3D modelling
KW - Bakhtiyari dam
KW - Extra large flat jack (ELFJ)
KW - Flat jack testing
UR - http://www.scopus.com/inward/record.url?scp=85051188246&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051188246&partnerID=8YFLogxK
U2 - 10.1520/GTJ20160040
DO - 10.1520/GTJ20160040
M3 - Article
AN - SCOPUS:85051188246
VL - 40
SP - 452
EP - 466
JO - Geotechnical Testing Journal
JF - Geotechnical Testing Journal
SN - 0149-6115
IS - 3
ER -