Simplified finite-element modelling for tunnelling-induced settlements

Likitlersuang, Suched; Surarak, Chanaton; Suwansawat, Suchatvee; Wanatowski, Dariusz; Oh, Erwin; Balasubramaniam, A. S.

doi:10.1680/gr.14.00016

Cited by 42 publications

(20 citation statements)

References 21 publications

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“…The results indicated that the hardening soil model (HSS) with small strain can provide better results compared to measured data. To date, more researchers (Likitlersuang et al , 2014; Liao et al , 2016) adopted the HSS with small strain to study the behavior of underground excavation. Therefore, the HSS with small strain is also adopted in this study to assess the behavior of the retaining walls, a set of analyses about the Kuhne Building (Case 10) are conducted by the commercially available PLAXIS 2D (Brinkgreve et al , 2015).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of excavation-induced movements through case histories in Hangzhou

Ying

Cheng

Zhang

et al. 2020

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Purpose Deep excavation in soft clay often causes additional deformations to surroundings. Then, if deformations cannot be predicted reasonably, the adjacent buildings may be threatened by the deep excavation. Based on the good field observations from ten deep excavations in Hangzhou, this paper aims to thoroughly investigate the characteristics of wall deflections and ground settlements induced by deep excavations. Design/methodology/approach On the basis of good field observation of ten deep excavations, the performances of excavations, supported by contiguous pile in Hangzhou, were studied, and also compared with other case histories. Findings The maximum wall deflections (dhm) rang mostly from 0.7 to 1.2 per cent He, where He is the final excavation depth, larger than those in Taipei and Shanghai. The observed maximum ground settlement in the Hangzhou cases generally ranges from 0.2 to 0.8 per cent He. Then, the settlement influence zone extends to a distance of 2.0-4.0 He from the excavation. The relatively large movements and influence zones in Hangzhou may be attributed to low stability numbers, large excavation widths and the creep effect. The excavation width is justified to have a significant influence on the wall deflection. Therefore, to establish a semi-empirical formula for predicting the maximum wall deflection, it is necessary to include the factor of excavation width. Originality/value The relevant literature concentrated on the characteristics of deep excavations supported by the contiguous pile wall in Hangzhou soft clay can rarely be found. Based on the ten deep excavations with good field observation in Hangzhou, the characteristics of wall deflection and ground settlements were comprehensively studied for the first time, which can provide some theoretical support for similar projects.

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Section: Discussionmentioning

confidence: 99%

Evaluation of excavation-induced movements through case histories in Hangzhou

Ying

Cheng

Zhang

et al. 2020

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“…Lade and Trads, 2014;Likitlersuang et al, 2014). This suggests that the tendency of lime-treated specimens containing salt to exhibit a dilative behaviour during drained loading results in an increase in the soil's shear strength within 7 d of curing.…”

Section: Drained Behaviourmentioning

confidence: 96%

Strength improvement of lime-treated clay with sodium chloride

Yunus¹,

Wanatowski

Marto

et al. 2017

Geotechnical Research

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Lime stabilisation of organic clay has often been studied in the past. However, there is some evidence in the literature that the presence of high concentrations of organic matter in clay soil can lessen the chemical reaction between lime and clay minerals and can have detrimental effects on the engineering properties of soil. Hence, in this paper, the stress-strain behaviour and strength properties of organic soil treated with lime and sodium chloride (NaCl) are analysed. A soil mixture, prepared with 5% lime content and 1·5% humic acid, was stabilised with varying quantities of sodium chloride (0·5, 2·0 and 5·0%). Consolidated undrained and drained triaxial tests were carried out on specimens at curing periods of 7 and 28 d with applied confining pressures of 50 and 100 kPa. Scanning electron microscopy and X-ray diffraction analysis were used to observe the microstructural changes resulting from cementation materials. It was found that the introduction of sodium chloride improved considerably the strength properties of the lime-treated organic clay. The microstructural analysis also confirmed the presence of calcium silicate hydrate in a salttreated organic clay, which was the main contributing factor to the enhanced engineering properties of the clay.

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“…In the last phase, the soil cluster inside the tunnel is deactivated, the same time the tunnel lining is activated. For further details about lining contraction and stress reduction method can be referred to Likitlersuang et al (2014). As mention, the procedure of lining contraction and stress reduction was done in the PLAXIS 2D software with the selected soil profile as shown in Figure 5.…”

Section: Finite Element Simulation Of Twin Tunnel Excavation Using LImentioning

confidence: 99%

“…Many geotechnical software developers apply FEM in their computational tool to solve geotechnical problems. However, the use of FEM in settlement prediction is still not that much accurate because of many factors such as simplified geometry and boundary condition, mesh generation, initial input of ground data and the type of constitutive model chosen for the analysis (Likitlersuang et al, 2014). To understand the behaviour of the soil, researchers developed soil constitutive model.…”

Section: Introductionmentioning

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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Simplified finite-element modelling for tunnelling-induced settlements

Cited by 42 publications

References 21 publications

Evaluation of excavation-induced movements through case histories in Hangzhou

Evaluation of excavation-induced movements through case histories in Hangzhou

Strength improvement of lime-treated clay with sodium chloride

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

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