Predicting ground movements in London Clay

Jurečič, Nina; Zdravković, Lidija; Jovičić, Vojkan

doi:10.1680/geng.11.00079

Cited by 12 publications

(7 citation statements)

References 24 publications

(38 reference statements)

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“…Table 2. The values of G 0 , ν and φ p are taken directly from Jurečič et al (2013), and critical state shearing is assumed at failure so that φ cv = φ p (refer to Doherty & Muir Wood (2013) for background on this assumption). Following Doherty & Muir Wood (2013), a small value of attraction (a = 4 kPa) is adopted.…”

Section: Terrace Gravelmentioning

confidence: 99%

“…Following Doherty & Muir Wood (2013), a small value of attraction (a = 4 kPa) is adopted. The hardening parameter β is determined by finding an approximate fit to the small-strain stiffness data plotted in Jurečič et al (2013). The resulting variation of tangent shear modulus with deviatoric strain from the EMC model is plotted in Fig.…”

Section: Terrace Gravelmentioning

confidence: 99%

“…It is widely recognised (e.g. Addenbrooke et al, 1997;Jurečič et al, 2013) that the computation of realistic greenfield settlement curves requires constitutive models (such as those employed in the current work) that can model the nonlinear small-strain stiffness of the soil. Moreover, the modelling of ground loss by imposing prescribed displacements at the tunnel perimeter has been found to be a useful way of achieving plausible computed surface deformations.…”

Section: Tunnel Modelling Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Finite-element modelling for the assessment of tunnel-induced damage to a masonry building

2017

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The likely severity and extent of cracking damage in existing masonry buildings caused by shallow tunnelling in urban areas is typically assessed in practice using a phased sequence of calculations of increasing complexity. If initial assessments (e.g. with the building modelled as an elastic beam) suggest that damage could be significant, or for high heritage-value buildings, it may be appropriate to conduct more detailed assessments using 3D numerical analysis. The current paper demonstrates the application of 3D finite element modelling in this context. Models are developed to quantify the effect of shallow tunnelling on an example masonry building founded on strip footings, considering both single and twin tunnel scenarios in a typical London soil profile. The analyses use appropriate constitutive models for the soil and the masonry, and allow for the possibility of slippage and gapping at the soil-foundation interface. The results presented here focus on the interaction between the soil and the building (via its foundations) and on the influence of explicitly modelled window and door openings. It is shown that useful damage predictions can be obtained from 3D analysis of a single facade and foundation, without needing to model a complete building. The study also highlights some of the limitations of current elastic beam assessment methods.

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Section: Terrace Gravelmentioning

confidence: 99%

Section: Terrace Gravelmentioning

confidence: 99%

Section: Tunnel Modelling Proceduresmentioning

confidence: 99%

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Finite-element modelling for the assessment of tunnel-induced damage to a masonry building

2017

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“…While in Geotechnical Earthquake Engineering a constant Poisson's ratio, , is often assumed, a nonlinear variation of bulk modulus with strain is typically employed when analysing static problems (e.g. [19,20]). Therefore, to maximise its flexibility, the IC.G3S model allows either of these two scenarios to be adopted.…”

Section: Constitutive Modelmentioning

confidence: 99%

On the assessment of energy dissipated through hysteresis in finite element analysis

Taborda

Potts

Zdravković

2016

Computers and Geotechnics

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Abstract:The accurate reproduction of the hysteretic behaviour exhibited by soils under cyclic loading is a crucial aspect of dynamic finite element analyses and is typically described using the concept of damping ratio. In this paper, a general algorithm is presented for assessing the damping ratio simulated by any constitutive model based on the registered behaviour in three-dimensional stress-strain space. A cyclic nonlinear elastic model capable of accurately reproducing a wide range of features of soil behaviour, including the variation of damping ratio with deformation level, is chosen to illustrate the capabilities of the proposed algorithm. The constitutive model is described and subsequently employed in two sets of finite element analyses, one involving the dynamic response of a sand deposit subjected to different types of motion and another focussing on the simulation of a footing subjected to cyclic axial loading. The application of the presented algorithm provides insight into the processes through which energy is dissipated through hysteresis.

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“…Jurečič et al (2013) emphasise the necessity of accounting for small-strain behaviour of soils in numerical models, particularly when considering the serviceability limit states of geotechnical structures. Although this is well understood both nationally and internationally, this paper considers recent laboratory research into the behaviour of London Clay in conjunction with field data from the ground works at Heathrow Airport Terminal 5.…”

mentioning

confidence: 99%