Challenges in geotechnical design revealed by reliability assessment: Review and future perspectives

Otake, Yu; Honjo, Yusuke

doi:10.1016/j.sandf.2022.101129

Cited by 24 publications

(3 citation statements)

References 89 publications

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“…The continuing development of urban underground space requires the excavation of increasingly larger, deeper, and denser pits [1][2][3]. The excavation and support of a pit disturbs and changes the distribution of stress in the surrounding rock and soil mass and leads to the deformation, instability, and even failure of a pit with salient spatiotemporal characteristics [4,5].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

Guo,

Liu

2024

Processes

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Deformation of ultra-deep pit walls and surrounding geotechnical bodies due to engineering disturbances typically shows intricate spatiotemporal patterns. In this study, deformations at critical steps of the construction process were first numerically simulated by Midas GTS NX, and this was followed by lab-scale geophysical model tests of the entire process of the pit construction. Data on deformation obtained from numerical simulations and lab-scale geophysical model tests were compared with those obtained from a dynamic monitoring scheme in the field to analyze the characteristics of the deformation and evolution of the pit wall. This was used to derive a generally applicable theoretical expression to predict variations in the horizontal displacements.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

Guo,

Liu

2024

Processes

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“…The process of subsurface soil classification and stratification (or zonation) is highly important for preparing the geotechnical site report before tending to commence any design and construction of structures [1][2][3][4][5][6][7]. However, considering various limitations such as shortage of time, lack of budget, not having suitable access to subsurface soil, and more practically, insufficient information collected from site investigation spots in terms of the number of boreholes and cone penetration tests (CPTs) [8][9][10][11][12][13][14], this process may lead to challenging sessions of interpreting the gathered data and considerable uncertainties in classified soil samples [4,11,13,14]. It has been investigated that the quality of the data obtained from site investigations can greatly affect the risk of foundation failure which can be reduced by increasing the scope of the site investigation [15].…”

Section: Introductionmentioning

confidence: 99%

Seismic performance assessment of intermediate moment-resisting steel frames designed based on misidentified site soil classes

2023

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This research aims to investigate the extent that an incorrect assumption for soil type may endanger the seismic safety of moment-resisting steel frame structures using probabilistic assessment. To this aim, first, a set of moment-resisting steel frame structures were designed for the site soil class C. The examined structures were 3-, 6-, and 9-storey designed by CSI ETABS software according to ASCE7-16. Then, assuming that the actual soil type had been B, C, or D, seismic vulnerability assessments were performed using OpenSees software. For this purpose, a two-dimensional model of each structure was undergone the incremental nonlinear dynamic analysis (IDA) subjected to far-field, near-field (with pulse), and near-field (without pulse) ground motions of FEMA-P695. The fragility curves were developed for each model under each ground motion record type and accordingly the collapse margin ratio for each model was calculated. The results indicated that within the LS performance level at S a(Design) , site soil class B decreases the exceedance probability slightly but site soil class D tends to increase the exceedance probability significantly, especially as the height increases. Furthermore, it was found that the soil-structure interaction (SSI) has a negligible effect on the collapse margin ratio in all the investigated models.

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“…These lectures, part of a select few that have addressed risk and reliability since the series' inception, highlight the evolving understanding and importance of these concepts in the field. The substantial body of literature on geotechnical risk and reliability that has emerged since the 1960s is a testament to this growth [6][7][8][9][10][11][12] , with Phoon 2 providing a recent comprehensive review, including extensive references.…”

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confidence: 99%

Shallow foundation design: a comparative study of partial safety factors and full probabilistic methods

Vořechovský,

Miča,

Boštík

2024

Sci Rep

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In the past two decades, Europe has witnessed a significant transition in the design codes used for assessing foundation structures, with the widespread adoption of the Eurocodes (EC). This shift remains a pertinent topic within the engineering community, particularly concerning the transition from traditional design methodologies to those prescribed by the Eurocodes, as well as the potential for fully probabilistic design. While the Eurocodes’ methodology is described as probabilistic, it is crucial to recognize that the achievement of the target reliability level is predominantly facilitated through a system of partial safety factors. These factors are integrated into the calculation algorithm as fixed values, rendering the process essentially deterministic. To refine these calculations for more accurate reliability estimates—expressed in terms of failure probability—a genuinely probabilistic framework is required, termed as fully probabilistic computation. This paper aims to elucidate the fully probabilistic calculation approach for the broader professional community, using the geotechnical application of shallow foundations as an illustrative example. We present a comparative analysis of this advanced approach with the standard foundation design according to EC7 and ČSN 731001, the latter being a precursor in Europe for implementing the partial safety factor method. The discussion extends to a practical demonstration of full probabilistic design juxtaposed against the conventional partial safety factor method, using a shallow foundation case study. Furthermore, the paper delves into the impact of the tail behavior of uncertain or spatially varying soil parameters on the theoretical probability of failure, underscoring its significance in foundation design.

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Challenges in geotechnical design revealed by reliability assessment: Review and future perspectives

Cited by 24 publications

References 89 publications

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

Seismic performance assessment of intermediate moment-resisting steel frames designed based on misidentified site soil classes

Shallow foundation design: a comparative study of partial safety factors and full probabilistic methods

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