Ultimate bearing capacity of strip footings on sand overlying clay under inclined loading

Zheng, Gang; Zhao, Jiapeng; Zhou, Haizuo; Zhang, Tianqi

doi:10.1016/j.compgeo.2018.11.003

Cited by 37 publications

(11 citation statements)

References 36 publications

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“…From the failure mechanism of the composite foundation depicted in Figure 6a,b, it can be seen that, when T s /L = 0.1 and ϕ = 20 • , a "punching-through" failure pattern is developed in region (f 1 ), which includes a rigid block near the pile beneath the footing, a passive wedge at lower right of the wheel in the sand layer, and a fan in the lower clay layer. Similar conclusions are also reported by Zheng et al (2018) [23] in their investigation of the failure mechanism of the strip footing in sand-over-clay soil deposit. In addition, more evident plastic strain areas (f 2 ) and (f 3 ) at the interface of the two soil layers and the plastic strain areas (f 4 ) under the wheel are captured when T s /L = 0.1 and ϕ = 20 • as compared to that of ϕ = 40 • .…”

Section: Effects Of Sand Layer Thickness and Soil Properties (S Um K And ϕ)supporting

confidence: 88%

“…Existing understandings only cover the failure mechanisms of conventional types of foundations in such sand-overlying-clay soil profiles [18][19][20][21][22]. For example, Zheng et al (2018) [23] found a 'punch-through' failure pattern for strip footings in the sand-over-clay layered deposits, where the upper sand block is pushed into the underlying clay due to the vertical compression under V-H-M combined loadings. However, the bearing capacities and failure mechanisms of this composite foundation are still not well investigated in such soil conditions.…”

Section: Introduction 1conceptmentioning

confidence: 99%

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Bearing Capacity of Single Pile-Friction Wheel Composite Foundation on Sand-over-Clay Deposit under V-H-M Combined Loadings

Wang

Zou

2021

Applied Sciences

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This paper presents numerical modelling to investigate the bearing capacities and failure mechanisms of single pile-friction wheel composite foundation in sand-overlying-clay soil conditions under combined V-H-M (vertical-horizontal-moment) loadings. A series of detailed numerical models, with validations of centrifuge testing results, are generated to explore the potential factors influencing the bearing capacity of this composite system. Intensive parametric study is then performed to quantify the influences of the foundation geometry, soil properties, sand layer thickness, pre-vertical loading and lateral loading height on the failure envelopes in the V-H-M domain. Last but not least, an empirical design procedure is proposed based on a parametric study to predict the bearing capacity of this composite foundation under various loading conditions, which can provide guidance for its design and application.

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Section: Effects Of Sand Layer Thickness and Soil Properties (S Um K And ϕ)supporting

confidence: 88%

Section: Introduction 1conceptmentioning

confidence: 99%

Bearing Capacity of Single Pile-Friction Wheel Composite Foundation on Sand-over-Clay Deposit under V-H-M Combined Loadings

Wang

Zou

2021

Applied Sciences

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“…Close examination of Figs. 6a and 6b reveals that the influence of non-dimensional frequency on the vertical and horizontal bearing capacities of surface footing under various modified pseudo-dynamic loading scenarios becomes fairly negligible beyond the load inclination angle of about 30 o , as all curves converge afterwards.As shown in Fig.6c, the general shapes of the yield surfaces in the normalized 𝑉 − 𝐻 plane are well described by a parabolic form, as also observed in several previous studies(Loukidis et al 2008;Krabbenhoft et al 2012;Zheng et al 2019; among others). In all failure envelopes, 𝐻/𝑉 𝑚𝑎𝑥(𝑠𝑡𝑎𝑡𝑖𝑐) first increases with 𝑉/𝑉 𝑚𝑎𝑥(𝑠𝑡𝑎𝑡𝑖𝑐) until it reaches a maximum value.…”

supporting

confidence: 87%

Modified Pseudo-Dynamic Bearing Capacity of Shallow Foundations Subjected to Inclined-Eccentric Combined Loading

Tavakoli

Fathipour

Payan

et al. 2022

Preprint

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Shallow foundations are commonly subjected to simultaneous inclined and eccentric combined loadings exerted by the overlying superstructure and geo-environmental sources. The performance of such footings in seismic-prone areas is a topic of great interest in geotechnical engineering practice. In this paper, a comprehensive parametric study is conducted to evaluate the seismic bearing capacity of shallow strip foundations overlying dry and cohesionless granular soil under the action of vertical-horizontal-moment combined loading. For this purpose, a systematic combination of the lower-bound theorems of the limit analysis, the finite element method, and the nonlinear programming is implemented. The second-order cone programming (SOCP) is adopted for efficient optimization purposes so as to model the actual nonlinear form of the universal Mohr-Coulomb yield function. In addition, the equilibrium equations associated with the combined loading are incorporated into the lower bound formulations. The seismic condition is simulated by the well-established modified pseudo-dynamic approach by accounting for the significant influence of phase difference as well as the primary and shear waves propagation through applying non-uniform inertia forces along the vertical and horizontal directions, respectively. The employed formulations are rigorously validated against a majority of high-quality studies in the literature in the static combined loading condition. The results of the seismic bearing capacity are presented in the forms of spectral responses and failure envelopes for the eccentric and inclined loadings. Accordingly, the influences of non-dimensional frequency, induced seismic acceleration and material damping on the ultimate bearing capacity of eccentrically and obliquely loaded strip footings are thoroughly examined and discussed. The results show that the most critical responses of the shallow foundation are captured in the resonance condition of earthquake excitation. As the seismic intensity decreases and the damping ratio increases, the spectral vertical, horizontal and moment bearing capacities of surface footings become smoother. In addition, the failure envelopes of the shallow foundation subjected to either inclined or eccentric loading significantly shrink with the increase in the earthquake accelerations and decrease in the material damping of the underlying soil mass. The amount of changes in the size of failure envelopes in the normalized V - H and V - M spaces due to the variation of seismic intensity and material damping depends directly on the non-dimensional frequency of the earthquake excitation.

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“…Furthermore, MARS does not need any assumption between input and output variables. MARS is suitable for high-dimensional issues that contain many input and output variables (e.g., Zheng et al, 2019b;Zhang et al, 2019;Jearsiripongkul et al, 2022;Lai et al, 2022;Sirimontree et al, 2022;Yodsomjai et al, 2022).…”

Section: Figure 14mentioning

confidence: 99%

A machine learning regression approach for predicting the bearing capacity of a strip footing on rock mass under inclined and eccentric load

Lai

Sangjinda

Keawsawasvong

et al. 2022

Front. Built Environ.

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In this study, the Multivariate Adaptive Regression Splines (MARS) model is employed to create a data-driven prediction for the bearing capacity of a strip footing on rock mass subjected to an inclined and eccentric load. The strengths of rock masses are based on the Hoek-Brown failure criterion. To develop the set of training data in MARS, the lower and upper bound finite element limit analysis (FELA) is carried out to obtain the numerical results of the bearing capacity of a strip footing with the width of B. There are six considered dimensionless variables, including the geological strength index (GSI), the rock constant/yield parameter (mi), the dimensionless strength (γB/σci), the adhesion factor (α), load inclined angle from the vertical axis (β), and the eccentricity of load (e/B). A total of 5,120 FELA solutions of the bearing capacity factor (P/σciB) are obtained and used as a training data set. The influences of all dimensionless variables on the bearing capacity factors and the failure mechanisms are investigated and discussed in detail. The sensitivity analysis of these dimensionless variables is also examined.

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Ultimate bearing capacity of strip footings on sand overlying clay under inclined loading

Cited by 37 publications

References 36 publications

Bearing Capacity of Single Pile-Friction Wheel Composite Foundation on Sand-over-Clay Deposit under V-H-M Combined Loadings

Bearing Capacity of Single Pile-Friction Wheel Composite Foundation on Sand-over-Clay Deposit under V-H-M Combined Loadings

Modified Pseudo-Dynamic Bearing Capacity of Shallow Foundations Subjected to Inclined-Eccentric Combined Loading

A machine learning regression approach for predicting the bearing capacity of a strip footing on rock mass under inclined and eccentric load

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