TY - GEN
T1 - Interpretation of soil parameters used for numerical analysis with small strain model for deep excavation in loose to medium dense sand
AU - Bin-Chen, Hsiung Benson
AU - Hai, Phan Khac
AU - Hung, Ching
N1 - Publisher Copyright:
© 2021 ISSMGE, London, UK
PY - 2021
Y1 - 2021
N2 - In this paper, a Hardening Soil- Small strain (HSS) model, capable of characterizing the small strain behavior of the soils, is utilized to evaluate the performances of deep excavations in loose to medium dense sands. First, the stiffnesses of the sandy soils are collected mainly from the results of in- situ and laboratory tests from previous studies, and additional two small strain stiffness parameters, the shear modulus at very small strain level, Go, and the threshold shear strain, γ0.7, are also interpreted through laboratory tests. Second, the sandy soil parameters are validated to examine the behaviour of excavation in terms of lateral wall movements and ground surface settlements. The results of the numerical analyses show that the Go can be defined as a function of the depth and the threshold of 1 times 10-4 of shear strain γ0.7 can be revealed. Those input parameters are recommended for analyses of deep excavation in loose to medium dense sand if the HSS model is adopted. Also, the stress-controlled method is followed in the current test standard of one of in-situ tests, Pressuremeter test which may have to be re-considered in order to fit the reality on site.
AB - In this paper, a Hardening Soil- Small strain (HSS) model, capable of characterizing the small strain behavior of the soils, is utilized to evaluate the performances of deep excavations in loose to medium dense sands. First, the stiffnesses of the sandy soils are collected mainly from the results of in- situ and laboratory tests from previous studies, and additional two small strain stiffness parameters, the shear modulus at very small strain level, Go, and the threshold shear strain, γ0.7, are also interpreted through laboratory tests. Second, the sandy soil parameters are validated to examine the behaviour of excavation in terms of lateral wall movements and ground surface settlements. The results of the numerical analyses show that the Go can be defined as a function of the depth and the threshold of 1 times 10-4 of shear strain γ0.7 can be revealed. Those input parameters are recommended for analyses of deep excavation in loose to medium dense sand if the HSS model is adopted. Also, the stress-controlled method is followed in the current test standard of one of in-situ tests, Pressuremeter test which may have to be re-considered in order to fit the reality on site.
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U2 - 10.1201/9780429321559-36
DO - 10.1201/9780429321559-36
M3 - Conference contribution
AN - SCOPUS:85117423166
T3 - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022
SP - 283
EP - 290
BT - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022
A2 - Elshafie, Mohammed Z.E.B.
A2 - Viggiani, Giulia M.B.
A2 - Mair, Robert J.
PB - CRC Press/Balkema
T2 - 10th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, IS-CAMBRIDGE 2022
Y2 - 27 June 2022 through 29 June 2022
ER -