Simplified Model for Evaluating Damage Potential of Buildings Adjacent to a Braced Excavation

Schuster, Matt; Kung, Gordon Tung-Chin; Juang, C. Hsein; Hashash, Youssef M. A.

doi:10.1061/(asce)gt.1943-5606.0000161

Cited by 90 publications

(34 citation statements)

References 17 publications

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“…For this example, the robust design optimisation may be set-up as shown in Figure 17. For the safety constraints shown in Figure 17, the reader is referred to Ou (2006) for limiting factors of safety requirements, and to PSCG (2000) and Schuster et al (2009) for the serviceability Table 3. Design space and design parameters for example no.…”

Section: System Responsementioning

confidence: 99%

Robust design in geotechnical engineering – an update

Khoshnevisan

Gong

Wang

et al. 2014

Georisk: Assessment and Management of Risk for Engineered Syste

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This paper presents an update for the robust geotechnical design (RGD) methodology, which seeks an optimal design with respect to design robustness and cost efficiency, while satisfying the safety requirements. In general, the design robustness is achieved if the system response is insensitive to the variation in the uncertain input parameters (called "noise factors"). In other words, a design is considered robust if the system response exhibits little variation, even though there is high variation in the input parameters. Robust design achieves this desirable outcome by carefully adjusting 'design parameters' (i.e., the parameters that can be controlled by the designer, such as the geometry and dimensions) without reducing the uncertainty in the noise factors. In this paper, the existing RGD methodology is updated with a gradient-based robustness measure and a simplified procedure for seeking the knee point. The RGD methodology and its simplified version (with new updates) are illustrated with three design examples. The results presented in this paper show that the RGD methodology and its simplified version are effective design tools that considers safety, cost and design robustness simultaneously. The advantages of the simplified RGD approach are discussed.

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Section: System Responsementioning

confidence: 99%

Robust design in geotechnical engineering – an update

Khoshnevisan

Gong

Wang

et al. 2014

Georisk: Assessment and Management of Risk for Engineered Syste

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“…This procedure generally includes the following steps: (1) Characterizing statistics of input soil parameters; (2) Establishing the vertical and horizontal ground movement profiles using the empirical models developed by Kung et al (2007) and Schuster et al (2009); (3) Determining the applied DPI value based on angular distortion and lateral strain computed from empirical equations developed by Schuster et al (2009); (4) Characterizing the model bias of applied DPI (denoted DPI L ); (5) Assuming prior probability ratio as unity and characterizing the model bias of limiting DPI (denoted DPI R ); (6) Performing reliability analysis using first-order reliability method (FORM, Juang et al 2011) based on DPI-based serviceability limit to determine the probability of damage; (7) Updating the prior probability ratio based on computed probability of damage till the convergence of the probability of damage.…”

Section: Fully Probabilistic Analysis For Probability Of Damage Assesmentioning

confidence: 99%

“…For diaphragm wall-supported excavation in clays, the thickness of diaphragm walls and average spacing of struts are the design parameters, which are easily controllable by the designer. The probability of damage of adjacent building is treated as the system response, because prevention of damage of adjacent building often controls the excavation design in urban area (Schuster et al 2009). By optimally selecting the design parameters, the variability of the system responses caused by uncertain statistics of noise factors can be reduced, which produces designs with greater robustness.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Schuster et al (2009) developed a deterministic procedure for the damage potential assessment in terms of Damage Potential Index (DPI), a parameter derived from the angular distortion and lateral strain in a building element that are caused by an excavation. Furthermore, Juang et al (2011) has implemented the DPI-based procedure into a fully probabilistic framework to evaluate the probability of damage of adjacent buildings considering both parametric uncertainty and model uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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Robust Design of Braced Excavations Using Multiobjective Optimization-Focusing on Prevention of Damage to Adjacent Buildings

Wang

Luo

Khoshnevisan

et al. 2014

Geo-Congress 2014 Technical Papers

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This paper presents a new geotechnical design methodology, referred to herein as robust geotechnical design (RGD), and its application in the braced excavation design in clays. The RGD approach is aimed at optimally selecting the design parameters so that the system response (e.g., the damage probability of the adjacent building caused by excavation) is insensitive to, or robust against, uncertainty in statistics of noise factors. In this paper, the uncertainty in the estimated statistics of noise factors is evaluated using the bootstrapping method and the variation in the probability of damage is evaluated using the point estimated method integrated with first order reliability method. The RGD is realized through a multi-objective optimization, in which all the requirements such as safety, robustness, and cost are explicitly considered. A design example of braced excavation is used to demonstrate the effectiveness and significance of the RGD approach.

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“…The ground settlement in the backfill area due to the excavation work has been estimated (Kojima et al, 2005;Kung et al, 2009;Ou et al, 2013) and its effect on responses of adjacent buildings has been investigated (Lin et al, 2017;Sabzi and Fakher, 2015;Schuster et al, 2009). Clough and O'Rourke (1990) have proposed the method to estimate settlement in clay and sandy soils for in situ wall systems using field measurement data and finite element analysis (Fig.…”

Section: Roadbed Settlementmentioning

confidence: 99%

Stability assessment of roadbed affected by ground subsidence adjacent to urban railways

Jeon

Park

Eum

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. In recent years, leakages in aged pipelines for water and sewage in urban areas have frequently induced ground loss, resulting in cavities and ground subsidence, causing roadbed settlement greater than the allowable value. In this study, FLAC 3D , which is a three-dimensional finitedifference numerical modeling software, is used to perform stability and risk level assessment for the roadbed adjacent to urban railways with respect to various groundwater levels and the geometric characteristics of cavities. Numerical results show that roadbed settlement increases as the diameter (D) of the cavity increases and the distance (d) between the roadbed and the cavity decreases. The regression analyses results show that, as D/d is greater than 0.2 and less than 0.3, the roadbed is in the status of caution or warning. It requires a database of measurement sensors for realtime monitoring of the roadbed, structures and groundwater to prevent disasters in advance. As D/d exceeds 0.35, the roadbed settlement substantially increases and the roadbed is in danger. Since this may result in highly probable traffic accidents, train operation should be stopped and the roadbed should be reinforced or repaired. The effects of groundwater level on roadbed settlement are examined and the analysis results indicate that roadbed settlement is highly influenced by groundwater levels to an extent greater than even the influence of the size of the cavity.

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Simplified Model for Evaluating Damage Potential of Buildings Adjacent to a Braced Excavation

Cited by 90 publications

References 17 publications

Robust design in geotechnical engineering – an update

Robust design in geotechnical engineering – an update

Robust Design of Braced Excavations Using Multiobjective Optimization-Focusing on Prevention of Damage to Adjacent Buildings

Stability assessment of roadbed affected by ground subsidence adjacent to urban railways

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