Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"back-analysis"”.
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Back-analysis methods for optimal tunnel design
… behavior of the underground work. The term back-analysis involves all the necessary procedures so that a predicted simulation yields results as close as possible to the observed behavior. This research aims in a better understanding of the back-analysis methodologies by examining both …
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Supervised learning for back analysis of excavations in the observational method
… within the observational method is recognised as back analysis. Supervised learning can aid in this process, providing a systematic procedure to assess soil parameters based on monitoring data and prediction of the ground response. A probabilistic model is developed in this research to account for …
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Application of new observational method on deep excavation retaining wall design in London Clay
… C and the ‘best-way-out’ or Reactive Approach D. Back-analysis is critical in the observational method. The whole process of back analysis is examining monitoring systems (observations) and predictions by the numerical analysis with the adopted soil constitutive models. Three Crossrail excavation …
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Analysis and behavior of preexisting landslides
… strength has been and still is being used for analysis of slopes that contain a preexisting shear surface. Some recent research suggests that preexisting shear surfaces may exhibit a shear strength that is greater than the drained residual value after a period of time in which the slope remains …
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Stress Estimation From Borehole Scans For Prediction Of Excavation Overbreak In Brittle Rock
… predicting stress along a borehole through the back analysis of borehole breakout and how this same approach could be employed to predict excavation overbreak. KGHM’s Victoria Project in Sudbury, Canada, was the location of data collection, which firstly involved site characterization through …
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Uma análise de recalques pelo Método de Asaoka modificado com enfoque probabilístico
Presents a back analysis of settlements measured from plates under Sarapuís Trial Embankment II, by Modified Asaoka´s Method, to obtain consolidation coefficients and total settlements of local soft clay layer. This embankment is placed at Sarapuí River´s bank, upon a soft clay layer (Sarapuí's …
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Development of Deep Site Specific and Reference Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand
… developed as part of this study can be used for back-analysis of earthquake ground motions, forward analysis of future ground motions, full 3D physics based simulations, or to refine 3D velocity models for the region. </p>
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Improved quarry design using deterministic and probabilistic techniques
… Safety factor evaluations with the potential for back-analysis and sensitivity studies are included to investigate alternative high wall designs. Reliability analysis using Monte Carlo sampling minimizes uncertainty and allows the use of all available data in a stability evaluation. E~tensive …
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Probabilistic Post-Liquefaction Residual Shear Strength Analyses of Cohesionless Soil Deposits: Application to the Kocaeli (1999) and Duzce (1999) Earthquakes
… laboratory testing programs or from the back-analysis of failures where liquefaction was involved and in-situ testing data was available. All available procedures utilize deterministic methods for estimation and selection of the liquefied shear strength. Over the past decade, there has …
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Stability assessment of entry roofs in underlying multiple seam mines
… of geology and loading. The finite element analysis technique was used to model a range of loading conditions and innerburden lithology. The innerburden thickness was varied from 50 to 20 feet. The innerburden lithology was varied in terms of percentage of sandstone and its location in the …
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The relationship between slope stability and pore-water pressure in highly plastic clay in the Carrot River Basin
… c' = 0 were determined for three landslides by back analysis. Laboratory tests showed Φᵣ' ranged from 6.0 to 9.1 °. Pore-water pressure distributions were characterized with models of steady state groundwater flow, drawdown following flooding, and of induced pore-water pressure caused by …
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Rapid Drawdown Analysis using the Finite Element Method
… flood. The current state of practice for RDD analysis is a multi-stage undrained strength method based on limit equilibrium. The primary objective of this research was to develop a new method for rapid drawdown based on the finite element method. The new method estimates undrained strengths …
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Integrated field investigation, numerical analysis and hazard assessment of the Portillo Rock Avalanche site, Central Andes, Chile
… volume of the PRA. The insights gained on the back analysis of the slope were used in later stages to assess the hazard potential of a recurring major rockslide. The distinct element code UDEC was used to evaluate the failure mechanism. Elasto-plastic modelling results showed that sliding and …
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Behaviour of model foundations on sand
… with a micro computer.<br/>- Finite Element analysis was used to model the foundation/ soil behaviour and the testing environment. The variation of both displacements and stresses, once processed, was plotted with position. The results were then compared with experimental data using back …
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Investigations of threshold effects in soil deformations
… from laboratory tests and that obtained from the back analysis of either field tests or back analysed structures. Some of the factors which affect soil stiffness are reviewed. The major factors affecting soil stiffness are identified as the stress history of samples, the current stress state and …
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Modelación de flujos de derrubios empleando el método SPH : aplicación a casos reales
… y varios eventos reales empleando la técnica del back-analysis. El primer tipo de prueba consistió en el análisis del problema de rotura de una presa, el fenómeno logró ser representado con excelente precisión, sin oscilaciones ni otras distorsiones, confirmando la estabilidad numérica del SPH. En …
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Experimental and analytical study of the shear transfer in composite shallow cellular floor beams
… rather than empirical formula. Finite Element Analysis of the concrete-infill-only shear connection was performed with a parametric study to further verify the design method that has been developed. Two flexural tests were carried out on a full-scale composite shallow cellular floor beam with a …
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The Residual Strength of Liquefied Soil
… residual strength of liquefied soil (Sr) is via back calculations using case histories. However, the complexity of flow slides makes case histories difficult to interpret, and combined with the limited number of case histories, it inherently implies large uncertainties in the derived empirical …
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Case history-based analysis of liquefaction in sloping ground
… focuses on sloping ground liquefaction. The analysis of liquefaction in sloping ground is divided into three steps: (1) liquefaction susceptibility; (2) liquefaction triggering; and (3) post-triggering stability analysis. Existing procedures to evaluate liquefaction susceptibility, …
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Foundation response to ground movements induced by tunnel excavation
… method were developed to enable the efficient analysis of tunnelling-induced effects on shallow and deep foundations. These approaches were applied in the back analyses of well-documented field case histories and centrifuge experiments to investigate in detail the response of foundations to …
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