Simulation of Conventional and Inverted Braced Excavations Using Subloading tij Model

Nakai, T.; Farias, Márcio M.; Bastos, Daniela Brito; Sato, Yasuharu

doi:10.3208/sandf.47.597

Cited by 17 publications

(3 citation statements)

References 18 publications

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“…However, the dense arrangement of struts could obstruct construction works and increase the cost and construction period because of insufficient working space. erefore, the strut-free retaining wall system was studied in several studies [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Study on Control of Wall Deflection in Earth Stepped-Twin Retaining Wall Using Anchor Method by means of Numerical Simulation

Maehara

Hamanaka

Sasaoka

et al. 2020

Advances in Civil Engineering

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The demand for specific earth retaining wall methods is increasing along with the advancement and overcrowding of underground space use such as the presence of adjacent structures in an urban area. To cope with this, the method named earth stepped-twin retaining wall is increasingly being applied. However, there is a concern about the workplace if the earth pressure causes a heaving and pressing phenomenon from both ends of the retaining wall in the earth stepped-twin retaining wall. Therefore, we proposed the application of an anchor method that contains the inner and outer walls by using numerical simulation. The effects of the difference in soil properties, the horizontal distance between the outer and inner walls, and the depth of the outer wall embedment on the anchor were investigated. The results of this study show that the wall deflection of the inner wall could improve by adopting the anchor support. Besides, it was found that the inner wall can be efficiently suppressed by adopting the hybrid system with anchors and struts according to the soil properties, horizontal distance, and the depth of the outer wall.

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Section: Introductionmentioning

confidence: 99%

Study on Control of Wall Deflection in Earth Stepped-Twin Retaining Wall Using Anchor Method by means of Numerical Simulation

Maehara

Hamanaka

Sasaoka

et al. 2020

Advances in Civil Engineering

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“…It can be seen from theseˆgures that the constitutive model can describe the stress-stain behavior of both materials including strain softening as well as the in‰uence of the conˆning pressure. Also, these values of the material parameters used in the analyses are the same as those in the 2D and 3D analyses of the model tests using the aluminum rods and alumina balls for tunneling problems (Shahin et al, 2004a;Shahin et al, 2004b) and braced excavation problems (Nakai et al, 2007). The initial stresses of the ground are calculated by simulating the selfweight consolidation by applying body forces (unit weight) in these analyses.…”

Section: Series IIImentioning

confidence: 99%

Influences of 3D Effects, Wall Deflection Process and Wall Deflection Mode in Retaining Wall Problems

Iwata

Nakai

Zhang

et al. 2007

Soils and Foundations

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Two-dimensional (2D) and three-dimensional (3D) model tests and the corresponding elastoplasticˆnite element analyses were carried out to investigate the in‰uences of 3D eŠects, wall de‰ection process and wall de‰ection mode on the earth pressures and the ground movements in retaining wall problems. Aluminum rod mass were used in 2D model tests, and alumina balls were used in 3D model tests. The stress-strain behavior of these materials is similar to that of dense sands with positive dilatancy. In theˆnite element analyses, a recently developed elastoplastic constitutive model, named subloading tij model, were used. This model can describe typical stress deformation and strength characteristics of soils such as the in‰uence of intermediate principal stress, the stress path dependency of plastic ‰ow and the in‰uence of density and/or conˆning pressure properly. The test results show that the earth pressures on the retaining wall in 3D condition are much smaller than those in 2D condition, and these distributions of earth pressure are more in‰uenced by the wall de‰ection process than by the wall de‰ection mode. Observed surface settlements at the backˆll just behind the wall in 3D condition are larger than those in 2D condition, but 3D surface settlements occur more locally. These 2D and 3D surface settlements are in‰uenced by the wall de‰ection process more than the wall de‰ection mode. However, at the same wall de‰ection process and the same wall de‰ection mode, there is not much diŠerence in the shapes of the earth pressure distributions and the surface settlement troughs between 2D and 3D conditions. These diŠerences and similarities of the earth pressures and the surface settlements are simulated not only qualitatively but also quantitatively in the analyses using the above constitutive model.

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“…This model can describe typical deformation and strength characteristics of soils such as the influence of intermediate principal stress, the influence of stress path dependency of plastic flow and the influence of density and/or confining pressure. The same parameters of aluminum rods as those used in the numerical simulation of model tests on other geotechnical problems (e.g.,Nakai et al, 2007;Shahin et al, 2011) are used for the ground materials. The values of the material parameters of aluminum rod mass are listed in…”

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confidence: 99%

Effective reinforcing method for increasing bearing capacity with geosynthetics

Nakai¹,

Shahin

Morikawa

et al. 2016

JGS Special Publication

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To increase bearing capacity of foundation, geosynthetic is laid beneath the foundation. In the previous research, the authors investigated the reinforcement mechanism by changing the length and the laying depth of the reinforcement (Nakai et al, 2009). In the present study, for increasing bearing capacity, reinforcing effect in the case where each edge of the reinforcement is fixed with the soil is investigated. For this purpose, 2D model tests and the corresponding non-linear finite element analysis are carried out. In these tests and simulation, the depth of the reinforcement is changed under two kinds of length of reinforcement. Reinforcing effects for both concentric and eccentric loads are discussed. It is revealed that a significant increase of the bearing capacity is observed in the model tests when the reinforcement having mostly the same length as wide of the foundation or a slightly larger length is set up in the ground with an appropriate depth under both concentric and eccentric loads. The results of numerical simulation in which the stress-stain behavior of the soil and the frictional behavior between soil and reinforcement are properly taken into consideration shows a good agreement with the observed results.

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Simulation of Conventional and Inverted Braced Excavations Using Subloading tij Model

Cited by 17 publications

References 18 publications

Study on Control of Wall Deflection in Earth Stepped-Twin Retaining Wall Using Anchor Method by means of Numerical Simulation

Study on Control of Wall Deflection in Earth Stepped-Twin Retaining Wall Using Anchor Method by means of Numerical Simulation

Influences of 3D Effects, Wall Deflection Process and Wall Deflection Mode in Retaining Wall Problems

Effective reinforcing method for increasing bearing capacity with geosynthetics

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