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Total and Effective Stress Rapid Drawdown Analysis of Levees.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Total and Effective Stress Rapid Drawdown Analysis of Levees./
作者:	Turkson, Prince.
面頁冊數:	1 online resource (449 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-07, Section: B.
Contained By:	Dissertations Abstracts International83-07B.
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28863028click for full text (PQDT)
ISBN:	9798759999195

Total and Effective Stress Rapid Drawdown Analysis of Levees.
Turkson, Prince.

Total and Effective Stress Rapid Drawdown Analysis of Levees. - 1 online resource (449 pages)

Source: Dissertations Abstracts International, Volume: 83-07, Section: B.

Thesis (Ph.D.)--Tennessee Technological University, 2021.

Includes bibliographical references

Rapid drawdown (RDD) is a critical stability design condition for the waterside slopes of levees. The difficulties associated with estimating accurate pore water pressures resulting from changes in water boundary conditions make undrained rapid drawdown analysis an attractive alternative.The primary objective of this research was to evaluate undrained shear strength from relatively cheaper and simpler test methods as an alternative to the Duncan, Wright and Wong multi-stage undrained RDD analysis of levees. Four different procedures of undrained shear strength evaluation were explored in this study. Procedure 1 estimated undrained shear strength as a function of soil depth using a constant undrained strength ratio. Procedure 2 considered undrained shear strength as a nonlinear function of major effective consolidation stress. Procedure 3 assigned undrained shear strength as a single value to the embankment soil mass and Procedure 4 used procedures in Duncan, Wright, and Wong method to assign shear strength to embankment soil for RDD analysis. Generally, for the same slip surface, Procedure 3 predicted the highest factor of safety amongst all four procedures, and Procedure 2 predicted a lower factor of safety than Procedure 4. The factors of safety predicted by Procedure 1 were inconsistent with those obtained with Procedure 4.Probabilistic methods were applied to levee RDD analysis considering the undrained strength evaluation methods to assess the probability of failure (Pf). Levee soil hydraulic conductivity was shown to be the most influential parameter in determining the start-of-drawdown phreatic surface and the levee soil shear strength was shown to be the most influential in the predicted Pf. Generally, Procedure 2 was the most consistent in predicting a Pf higher than Procedure 4 for a given levee scenario at a reasonable level of uncertainty, which means it was slightly more conservative for most scenarios.This study also investigated the use of the Barcelona Basic Model (BBM) for effective stress RDD analysis. Pore pressures from the BBM following drawdown was shown to ignore changes in pore pressures from changes in shear stresses, because the soil remained in the elastic region. Variation in the BBM parameters did not substantially change the predicted pore pressures, and hence typical values of BBM parameters may be selected for RDD analysis. Finally, the effects of three unsaturated soil models namely the Simple model, Fredlund and Xing, and van Genuchten on the propagation of seepage within levees was investigated. The Simple model was shown to be the most conservative in the absence of reliable soil data.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798759999195Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Barcelona basic modelIndex Terms--Genre/Form:

542853
Electronic books.

Total and Effective Stress Rapid Drawdown Analysis of Levees.
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504 $a Includes bibliographical references
520 $a Rapid drawdown (RDD) is a critical stability design condition for the waterside slopes of levees. The difficulties associated with estimating accurate pore water pressures resulting from changes in water boundary conditions make undrained rapid drawdown analysis an attractive alternative.The primary objective of this research was to evaluate undrained shear strength from relatively cheaper and simpler test methods as an alternative to the Duncan, Wright and Wong multi-stage undrained RDD analysis of levees. Four different procedures of undrained shear strength evaluation were explored in this study. Procedure 1 estimated undrained shear strength as a function of soil depth using a constant undrained strength ratio. Procedure 2 considered undrained shear strength as a nonlinear function of major effective consolidation stress. Procedure 3 assigned undrained shear strength as a single value to the embankment soil mass and Procedure 4 used procedures in Duncan, Wright, and Wong method to assign shear strength to embankment soil for RDD analysis. Generally, for the same slip surface, Procedure 3 predicted the highest factor of safety amongst all four procedures, and Procedure 2 predicted a lower factor of safety than Procedure 4. The factors of safety predicted by Procedure 1 were inconsistent with those obtained with Procedure 4.Probabilistic methods were applied to levee RDD analysis considering the undrained strength evaluation methods to assess the probability of failure (Pf). Levee soil hydraulic conductivity was shown to be the most influential parameter in determining the start-of-drawdown phreatic surface and the levee soil shear strength was shown to be the most influential in the predicted Pf. Generally, Procedure 2 was the most consistent in predicting a Pf higher than Procedure 4 for a given levee scenario at a reasonable level of uncertainty, which means it was slightly more conservative for most scenarios.This study also investigated the use of the Barcelona Basic Model (BBM) for effective stress RDD analysis. Pore pressures from the BBM following drawdown was shown to ignore changes in pore pressures from changes in shear stresses, because the soil remained in the elastic region. Variation in the BBM parameters did not substantially change the predicted pore pressures, and hence typical values of BBM parameters may be selected for RDD analysis. Finally, the effects of three unsaturated soil models namely the Simple model, Fredlund and Xing, and van Genuchten on the propagation of seepage within levees was investigated. The Simple model was shown to be the most conservative in the absence of reliable soil data.
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653 $a Effective stress analysis
653 $a Levees
653 $a Pore pressure
653 $a Rapid drawdown
653 $a Undrained strength
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710 2 $a Tennessee Technological University. $b Civil Engineering. $3 2094000
773 0 $t Dissertations Abstracts International $g 83-07B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28863028 $z click for full text (PQDT)