Finite Element Simulation of Water Content-Influenced Progressive Failure of Sensitive Clays

Doan, Nhat-Phi; Woo, Seung-Wook; Hou, Yao-Long; Park, Sung-Sik

doi:10.1007/978-981-15-0802-8_134

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…The key input parameter of this model is the corrected SPT data (N1)60 of the site's ground. Many researchers have applied the UBCSAND model to laboratory tests and practical seismic designs (Doan, 2021;Doan et al, 2020aDoan et al, , 2020bNguyen et al, 2021bNguyen et al, , 2021aS.-S. Park et al, 2021;S. S. Park et al, 2020;S.-S. Park et al, 2020).…”

Section: Fully-coupled Effective Stress Analysismentioning

confidence: 99%

Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Doan

Nguyen

Doan

et al. 2023

Preprint

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Liquefaction has been known as a phenomenon in which the shear strength and stiffness of saturated soil are reduced by the generation of pore water pressure under earthquake loading. Consequently, liquefaction-induced settlement can result in severe damages including building cracks or slope failure, which pose a threat to human lives and properties. In the current Vietnamese standard TCVN 9386:2012, liquefaction potential hazard is often evaluated using the simplified method, which solely identifies the areas with a high risk of liquefaction. Prediction of Safety Factor (FS), Settlement (S), Liquefaction Potential Index (LPI), and Liquefaction Severity Number (LSN) has not received sufficient attention to a completeness standard. This study assesses the liquefaction of the ground at Ho Chi Minh City, Vietnam by using four conventional methods: the simplified procedure, linear equivalent analysis, loosely-coupled effective stress analysis, and fully-coupled effective stress analysis based on standard penetration test (SPT) data in Ho Chi Minh Metropolitan City. A class of seismic events that are compatible with the design response spectrum in the Vietnamese standard TCVN 9386:2012 is used as input ground motion at the bedrock. According to the results of different methods, maps of ground settlement, LPI, and LSN are proposed as useful references for construction works on such ground, which may have a high potential for liquefaction and subsidence.

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Section: Fully-coupled Effective Stress Analysismentioning

confidence: 99%

Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Doan

Nguyen

Doan

et al. 2023

Preprint

Self Cite

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“…The incremental formulation of an elasto‐plastic constitutive model can be expressed as follows (Prevost, 19 Park et al., 20 Doan et al 21

\begin{equation}\left\{ {\Delta \sigma ^{\prime}} \right\} = \ \left[ D \right]\ \left\{ {\Delta {\varepsilon ^e}} \right\} = \ \left[ D \right]\left\{ {\left\{ {\Delta \varepsilon } \right\} - \left\{ {\Delta {\varepsilon ^p}} \right\}} \right\}\end{equation}

where

\{ {{{\Delta}}\sigma ^{\prime}} \}

= a vector of effective stress increments, [ D ] = an elastic stiffness matrix, and

\{ {{{\Delta}}\varepsilon } \}

\{ {{{\Delta}}{\varepsilon ^e}} \}

, and

\{ {{{\Delta}}{\varepsilon ^p}} \}

= vectors of total, elastic, and plastic strain increments, respectively.…”

Section: Formulation Of Ubcsand2mentioning

confidence: 99%

“…The incremental formulation of an elasto-plastic constitutive model can be expressed as follows (Prevost, 19 Park et al, 20 Doan et al 21 ):…”

Section: Formulation Of Ubcsand2mentioning

confidence: 99%

“…It is an absolute value as 𝛾 * = |𝛾 − 𝛾 𝑟 | and is independent of loading patterns (i.e., two-sided or one-sided loading) as shown in Figure 13(A) and (B). In comparison with Equation (21), and (22), Equation ( 25) is more effective for actual earthquake motions. When the dilation occurs (i.e., 𝑑𝜀 𝑝 𝑣 < 0), H c is set to 1.0.…”

Section: 44mentioning

confidence: 99%

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Constitutive modeling of principal stress rotation associated with sand under simple shear loading

Park

Nong

Doan

2022

Num Anal Meth Geomechanics

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An elasto‐plastic constitutive model is proposed to account for the effect of principal stress rotation that commonly occurs and significantly influences soil behavior. The model is based on a concept of adding plastic strain increments obtained from two mobilized planes: a plane of maximum shear stress which swings as the principal stress rotates, and a horizontal plane which is spatially fixed. Models based on the plane of maximum shear stress alone are particularly sensitive to horizontal effective stress ratio K0 (=σ′x/σ′y), whereas the proposed model gives a similar skeleton behavior for soils at the same density and mean effective stress, regardless of the value of K0, as observed in laboratory tests. The model is firstly calibrated by data from drained and undrained monotonic and cyclic Direct Simple Shear (DSS) tests on K0‐consolidated specimens of Nakdong River sand in loose and dense states. The capability of the proposed model in modeling of the conventional liquefaction effects: initial shear stress condition α (=τ′xy/σ′y) with Kα corrections, and initial confining stress condition σ´y with Kσ corrections, is also emphasized in this paper.

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Numerical Simulation of the Effect of Void Direction and Volume on the Strength of Cemented Soil

2022

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Finite Element Simulation of Water Content-Influenced Progressive Failure of Sensitive Clays

Cited by 3 publications

References 8 publications

Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Liquefaction assessment using alternative approaches: a case study of Ho Chi Minh City stratigraphy

Constitutive modeling of principal stress rotation associated with sand under simple shear loading

Numerical Simulation of the Effect of Void Direction and Volume on the Strength of Cemented Soil

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