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[ subject:"Environmental engineering." ]
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Static and Seismic Performance of Ca...
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Shriro, Michelle Jennifer.
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Static and Seismic Performance of California Levees.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Static and Seismic Performance of California Levees./
作者:
Shriro, Michelle Jennifer.
面頁冊數:
667 p.
附註:
Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
Contained By:
Dissertation Abstracts International76-02B(E).
標題:
Environmental engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3640639
ISBN:
9781321261059
Static and Seismic Performance of California Levees.
Shriro, Michelle Jennifer.
Static and Seismic Performance of California Levees.
- 667 p.
Source: Dissertation Abstracts International, Volume: 76-02(E), Section: B.
Thesis (Ph.D.)--University of California, Berkeley, 2014.
This study has two main thrusts. The first part of the study addresses static seepage and stability of California levees as related to the presence of woody vegetation. The second part of this study addresses seismic deformations related to California levees through calibration, validation, and sensitivity analysis of a constitutive model implemented to capture seismic embankment deformations.
ISBN: 9781321261059Subjects--Topical Terms:
548583
Environmental engineering.
Static and Seismic Performance of California Levees.
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Thesis (Ph.D.)--University of California, Berkeley, 2014.
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This study has two main thrusts. The first part of the study addresses static seepage and stability of California levees as related to the presence of woody vegetation. The second part of this study addresses seismic deformations related to California levees through calibration, validation, and sensitivity analysis of a constitutive model implemented to capture seismic embankment deformations.
520
$a
Two field tests were conducted to investigate the effects of seepage in the vicinity of live and decaying tree root systems to examine the effects of live and decaying root systems on levee seepage and slope stability. The first field test involved the construction of parallel trenches in the vicinity of a eucalyptus stump located along the landside of the northern levee bordering the American River adjacent to the California Exposition and State Fair. The second field experiment was conducted along the crown of a bypassed levee along an oxbow segment of the seven mile slough on Twitchell Island in Rio Vista, California. An 8-foot deep crown trench was excavated to extend through the root system of a land side live oak tree, a water side valley oak tree, and a control section. The test was designed to evaluate the effects of seepage in the vicinity of live tree root systems.
520
$a
Based on calibrated numerical simulations, trees were found not to play a significant role in seepage-induced rotational or block failure of the levee slopes. However, where trees exhibit significant lean (center of mass extends beyond the fulcrum of the root plate), horizontal roots extending into the levee may place additional loads on the levee embankment. Loading of this type can be incorporated into two dimensional slope stability analyses, using mass-averaging to capture the three-dimensional impact of the tree.
520
$a
The second part of this research focused on seismically induced permanent displacement of earth levees, embankments, and earth-fill slopes resulting from liquefaction below these earth structures. Inertially driven ground movements of intermediate levels are the primary focus of this study. In these cases, the post-liquefaction static stability of the earth slope is greater than one, and seismically induced permanent displacements result primarily from earthquake shaking after liquefaction is triggered. Limited lateral spreads involving liquefaction of medium dense sand can produce seismic displacements on the order of several centimeters to a meter or more. These levels of seismic displacements are sufficient to damage severely levees. The most commonly employed simplified method for evaluation of seismic deformation at these intermediate levels relies on the concept post-liquefaction residual shear strength. For many practical cases, residual shear strength is ill-defined due to the ever changing resistance provided by soils that undergo repetitive dilative responses during cyclic loading. Where liquefied soils are sufficiently strong to resist flow failures, engineers lack satisfactory tools to evaluate the seismic performance of earth structures that overlie liquefiable soils.
520
$a
The study was generalized through a broader sensitivity study to investigate the seismic performance of earthen embankments built atop potentially liquefiable soils. Several representative levee sections on differing foundations are analyzed, wherein key characteristics, such as the thickness of the liquefiable layer and its relative density, are systematically varied to develop useful insights. The thickness of the liquefiable foundation layer impacted displacements in a non-linear pattern where displacement increased more rapidly as the liquefiable material layer thickness increases. As would be expected, combinations of thicker deposits of liquefiable foundation soils combined with higher embankments yielded the maximum displacement of the cases analyzed in this study. (Abstract shortened by UMI.).
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3640639
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