Determination of soil stiffness parameters at a deep excavation construction site in Kenny Hill Formation

Law, Kim Hing; Othman, Siti Zulaikha; Hashim, Roslan; Ismail, Zubaidah

doi:10.1016/j.measurement.2013.09.030

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…The proposed method is applied to a well-documented braced excavation project in Kuala Lumpur, Malaysia. 26,57,58 The excavation is 18.5 m in depth, approximately 30 m in width, and 35 m in length, as shown in Figure 11. The length-to-width ratio (L/B) of this excavation approximates to 1.0, indicating a strong three-dimensional effect.…”

Section: Project Background and Numerical Modelmentioning

confidence: 99%

“…More details about the excavation project can be found in Law et al 26,57,58 The finite element software PLAXIS 2D and PLAIXS 3D are used to perform numerical simulations. The layouts of the 2D FEM and the 3D FEM are shown in Figure 12A and B, respectively.…”

Section: Project Background and Numerical Modelmentioning

confidence: 99%

“…required in the HS model. 58 The coefficient α is related to the geological characteristics at a local site. For the soil conditions in the Kenny Hill Formation, the values of coefficient α are set to range from 1000 to 3000 in the previous literature.…”

Section: Project Background and Numerical Modelmentioning

confidence: 99%

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A bi‐fidelity inverse analysis method for deep excavations considering three‐dimensional effects

Tao,

Pan,

Sun

et al. 2024

Num Anal Meth Geomechanics

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Inverse analysis methods are commonly used in braced excavations for improved deformation predictions. This paper proposes a bi‐fidelity ensemble randomized maximum likelihood (BF‐EnRML) method for efficient inverse analyses of deep excavations considering the three‐dimensional effects. The bi‐fidelity (BF) model is developed by the low‐fidelity model (i.e., two‐dimensional finite element model, 2D FEM) and the high‐fidelity model (i.e., 3D FEM) for a balance between efficiency and accuracy. A large number of 2D FEMs are first used to explore the relationship between soil parameters and wall deflections. A few 3D FEMs are then performed to calibrate the discrepancy between 2D‐3D deflections caused by the inability of 2D FEM to consider the three‐dimensional effects. The constructed BF model serves as the forward model in inverse analysis. The soil parameters are updated by incorporating the monitoring data based on EnRML and further used to predict wall deflections in later stages. A hypothetical excavation and a real project are studied to evaluate the performance of the proposed method. The results show that the BF model can provide wall deflection predictions close to those calculated from 3D FEM while using a computational cost of 2D FEM. The BF‐EnRML method can efficiently update the soil parameters and improve the wall deflection predictions. Moreover, factors affecting the accuracy of the BF model are studied, including the number of required 3D FEMs, the distance from the evaluated wall section to the excavation corner, the number of data points along the wall depth, and the number of excavation stages.

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Section: Project Background and Numerical Modelmentioning

confidence: 99%

Section: Project Background and Numerical Modelmentioning

confidence: 99%

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A bi‐fidelity inverse analysis method for deep excavations considering three‐dimensional effects

Tao,

Pan,

Sun

et al. 2024

Num Anal Meth Geomechanics

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“…The three-main stiffness parameter that involves in the HS model is triaxial secant stiffness (E 50 ), oedometer stiffness (E oed ) and unloadingreloading stiffness (E ur ). For this study, the stiffness parameters for HS model in Kenny Hill Formation were determined based on the empirical correlation suggested by Law et al (2014) and Tan et al (2001). .…”

Section: Empirical Correlations Of Stiffness Parameters and Soil Paramentioning

confidence: 99%

“…Table 1 shows the HS model parameters obtained from empirical correlation. Correlation based on 1.5 SPT-N as proposed by Law et al (2014) was adopted for further analysis since it can agree well with the monitored settlement.…”

Section: Empirical Correlations Of Stiffness Parameters and Soil Paramentioning

confidence: 99%

Evaluation of tunnel interaction in Kenny Hill Formation using Finite Element Modelling

Govindasamy¹,

Ismail²,

Zaki³

2020

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The number of town population growth is the reason for the expansion of transportation and infra-structures in metropolitan cities. Due to that urban tunnelling has turned out to be common in most area. Considering the environmental impacts, going underground become a feasible choice for the development of transportation. But, when dealing with urban tunnelling, one always meet with complex mechanism due to soil interaction between ground and tunnels. Tunnelling problem must be considered as a three-dimensional problem. However, we can simulate the three-dimensional plane problem into a two-dimensional plane problem by considering certain assumption which governs the missing dimension. This paper is to show the simplified method for ground settlement prediction of tunnelling excavation using the PLAXIS 2D software. The two simplified methods are lining contraction and stress reduction method. The comparison between these two methods is described in this paper in terms of contraction ratio and unloading factor which can be used for tunnelling problems. This study was done in the Kuala Lumpur Kenny Hill Formation basically based on geotechnical data of Klang Valley Mass Rapid Transit (KVMRT) system. Hardening soil model is choosen as the constitutive model for this analysis because of its ability to represent the actual soil behaviour compared to Mohr Coulomb Model. The effectiveness of simulation using these two methods was verified with the monitored ground movement data. A relationship between these two methods was formed as the outcome of the study.

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Influence of Twin Tunnel Depth in Numerical Ground Movement Prediction Using Mohr Coulomb and Hardening Soil Model

Govindasamy

Ismail

Zaki

2019

Proceedings of AICCE'19

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Determination of soil stiffness parameters at a deep excavation construction site in Kenny Hill Formation

Abstract: The demand for underground space such as deep basement car-park, road and railway tunnels has increased substantially in highly urbanized areas due to scarcity of

Cited by 12 publications

References 18 publications

A bi‐fidelity inverse analysis method for deep excavations considering three‐dimensional effects

A bi‐fidelity inverse analysis method for deep excavations considering three‐dimensional effects

Evaluation of tunnel interaction in Kenny Hill Formation using Finite Element Modelling

Influence of Twin Tunnel Depth in Numerical Ground Movement Prediction Using Mohr Coulomb and Hardening Soil Model

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