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A simple estimation model for basal heave stability of braced excavations in anisotropic clay
https://orcid.org/http://orcid.org/0000-0001-6051-1388
The basal heave stability of the excavation and support system is a major concern to geotechnical design engineers, particularly in soft clay deposits. Conventional methods for estimating the basal heave stability of braced excavations generally do not consider the anisotropy of the soft clay, which may lead to the incorrect assessment of excavation stability. This study presents the results of extensive finite element analysis to investigate the influence of clay anisotropy on basal heave stability. The parameters that were considered include the ratio of the plane strain passive shear strength to the plane strain active shear strength suP/suA, the ratio of the unloading/reloading shear modulus to the plane strain active shear strength Gur/suA, the plane strain active shear strength suA, soil unit weight γ, wall system stiffness ln(S), excavation width B, excavation depth He, and the wall penetration depth D. A simple logarithmic regression model was developed for preliminary assessment of the basal heave factor of safety for braced excavations in anisotropic clay. Validations from case histories indicate that the proposed model can provide reasonable predictions of the basal heave stability in soft clay.
A simple estimation model for basal heave stability of braced excavations in anisotropic clay
https://orcid.org/http://orcid.org/0000-0001-6051-1388
The basal heave stability of the excavation and support system is a major concern to geotechnical design engineers, particularly in soft clay deposits. Conventional methods for estimating the basal heave stability of braced excavations generally do not consider the anisotropy of the soft clay, which may lead to the incorrect assessment of excavation stability. This study presents the results of extensive finite element analysis to investigate the influence of clay anisotropy on basal heave stability. The parameters that were considered include the ratio of the plane strain passive shear strength to the plane strain active shear strength suP/suA, the ratio of the unloading/reloading shear modulus to the plane strain active shear strength Gur/suA, the plane strain active shear strength suA, soil unit weight γ, wall system stiffness ln(S), excavation width B, excavation depth He, and the wall penetration depth D. A simple logarithmic regression model was developed for preliminary assessment of the basal heave factor of safety for braced excavations in anisotropic clay. Validations from case histories indicate that the proposed model can provide reasonable predictions of the basal heave stability in soft clay.
A simple estimation model for basal heave stability of braced excavations in anisotropic clay
https://orcid.org/http://orcid.org/0000-0001-6051-1388
The basal heave stability of the excavation and support system is a major concern to geotechnical design engineers, particularly in soft clay deposits. Conventional methods for estimating the basal heave stability of braced excavations generally do not consider the anisotropy of the soft clay, which may lead to the incorrect assessment of excavation stability. This study presents the results of extensive finite element analysis to investigate the influence of clay anisotropy on basal heave stability. The parameters that were considered include the ratio of the plane strain passive shear strength to the plane strain active shear strength suP/suA, the ratio of the unloading/reloading shear modulus to the plane strain active shear strength Gur/suA, the plane strain active shear strength suA, soil unit weight γ, wall system stiffness ln(S), excavation width B, excavation depth He, and the wall penetration depth D. A simple logarithmic regression model was developed for preliminary assessment of the basal heave factor of safety for braced excavations in anisotropic clay. Validations from case histories indicate that the proposed model can provide reasonable predictions of the basal heave stability in soft clay.
A simple estimation model for basal heave stability of braced excavations in anisotropic clay
Acta Geotech.
Zhang, Runhong (author) / Goh, Anthony Teck Chee (author) / Li, Yongqin (author) / Liu, Hanlong (author) / Wang, Lin (author) / Chen, Zhixiong (author) / Zhang, Wengang (author)
Acta Geotechnica ; 17 ; 5789-5800
2022-12-01
12 pages
Article (Journal)
Electronic Resource
English
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