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Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures./
Author:	Qin, Changbing.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	369 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
Subject:	Geological engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27988204
ISBN:	9798641902609

Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures.
Qin, Changbing.

Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 369 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--National University of Singapore (Singapore), 2019.

This item must not be sold to any third party vendors.

The occurrence of landslides or slope instability problems is still prevalent to date, particularly when subject to strong earthquakes. Therefore, accurate prediction of slope stability and slope improvement are of crucial importance to safeguard human and property losses. The highlight of this thesis is accordingly placed on earthquake-induced slope failures. Assessment of seismic slope stability in this thesis is conducted from the perspectives of: a) conventional kinematic analysis; b) discretization-based kinematic analysis; and c) centrifuge modelling. In addition, seismic active/passive earth pressures of a rigid retaining wall and seismic stability of reinforced soil slopes with piles and geosynthetics were investigated under different scenarios. Conventional upper bound analysis was first applied to evaluate the stability of simple slopes considering constant soil friction angles. Such an analysis is straightforward and efficient to provide a quick estimate on seismic slope stability. The upper bound formulations of stability factor and limiting failure load were derived in closed form based on the work rate balance equation. Normally consolidated soils widely exist in site, and the corresponding soil strength properties are usually deemed as linearly increased with depth. However, the conventional kinematic analysis is incapable of considering varying soil properties and complicated scenarios. In an effort to overcome this shortcoming, the discretization technique was proposed. Such a technique was applied to generate a kinematically admissible failure mechanism, following the associated flow rule. In this manner, the varying soil parameters such as friction angle, cohesion, as well as exterior loadings can be readily accounted for in the process of work rate calculations. The work rate-based balance equation permits the determination of upper bound formulations, considering complicated geological and loading conditions. In seismic slope stability analysis, a crucial step is to quantify the earthquake signal such as displacement, velocity or acceleration. Seismic accelerations are more commonly used. The acceleration time-history measured in the field consumes too much time and effort in analysis and hence widely used in numerical analyses. The most common approach is the pseudo-static approach where constant horizontal and/or vertical accelerations are adopted. However, results obtained from this static analysis are proven to be less over-conservative according to results obtained in the study. A simple pseudo-dynamic approach was proposed, considering shear and primary waves and offering a compromise between the above two methods. In order to produce more meaningful solutions, an improved pseudodynamic approach considering Rayleigh waves and modified pseudo-dynamic approach derived from the earthquake-induced displacement were applied in seismic assessment of slope stability. After the application of the discretization-based kinematic analysis to seismic slope stability, it was further extended to active and passive earth pressure calculations. Based on the active and passive failure mechanism behind a rigid retaining wall, the work rate calculations were performed for determining pseudostatic and pseudo-dynamic solutions of limiting earth pressures. Four pseudodynamic approaches including the simple, improved, modified and full-coupled analyses were discussed. Remediation techniques such as installation of stabilizing piles or geosynthetics were also studied considering the simple, improved, modified and full-coupled pseudo-dynamic approach. Results from the analysis and centrifuge test show that they were effective in enhancing slope stability. Some centrifuge model tests have been conducted to investigate the earthquake effect on submarine slopes. A shaker driven by hydraulic power was used to simulate the earthquake shaking with a prescribed sinusoidal wave. Particle Image Velocimetry (PIV) technique was then applied to depict the soil deformation and slope failure mechanism. Results in a sense match those obtained from the proposed discretization-based kinematic analyses.

ISBN: 9798641902609Subjects--Topical Terms:

2122713
Geological engineering.
Subjects--Index Terms:

Landslides

Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures.
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245 1 0 $a Seismic Analyses of Slope Stability and Limiting Earth Pressures Acting on Retaining Structures.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 369 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
500 $a Advisor: Chian, Siau Chen.
502 $a Thesis (Ph.D.)--National University of Singapore (Singapore), 2019.
506 $a This item must not be sold to any third party vendors.
520 $a The occurrence of landslides or slope instability problems is still prevalent to date, particularly when subject to strong earthquakes. Therefore, accurate prediction of slope stability and slope improvement are of crucial importance to safeguard human and property losses. The highlight of this thesis is accordingly placed on earthquake-induced slope failures. Assessment of seismic slope stability in this thesis is conducted from the perspectives of: a) conventional kinematic analysis; b) discretization-based kinematic analysis; and c) centrifuge modelling. In addition, seismic active/passive earth pressures of a rigid retaining wall and seismic stability of reinforced soil slopes with piles and geosynthetics were investigated under different scenarios. Conventional upper bound analysis was first applied to evaluate the stability of simple slopes considering constant soil friction angles. Such an analysis is straightforward and efficient to provide a quick estimate on seismic slope stability. The upper bound formulations of stability factor and limiting failure load were derived in closed form based on the work rate balance equation. Normally consolidated soils widely exist in site, and the corresponding soil strength properties are usually deemed as linearly increased with depth. However, the conventional kinematic analysis is incapable of considering varying soil properties and complicated scenarios. In an effort to overcome this shortcoming, the discretization technique was proposed. Such a technique was applied to generate a kinematically admissible failure mechanism, following the associated flow rule. In this manner, the varying soil parameters such as friction angle, cohesion, as well as exterior loadings can be readily accounted for in the process of work rate calculations. The work rate-based balance equation permits the determination of upper bound formulations, considering complicated geological and loading conditions. In seismic slope stability analysis, a crucial step is to quantify the earthquake signal such as displacement, velocity or acceleration. Seismic accelerations are more commonly used. The acceleration time-history measured in the field consumes too much time and effort in analysis and hence widely used in numerical analyses. The most common approach is the pseudo-static approach where constant horizontal and/or vertical accelerations are adopted. However, results obtained from this static analysis are proven to be less over-conservative according to results obtained in the study. A simple pseudo-dynamic approach was proposed, considering shear and primary waves and offering a compromise between the above two methods. In order to produce more meaningful solutions, an improved pseudodynamic approach considering Rayleigh waves and modified pseudo-dynamic approach derived from the earthquake-induced displacement were applied in seismic assessment of slope stability. After the application of the discretization-based kinematic analysis to seismic slope stability, it was further extended to active and passive earth pressure calculations. Based on the active and passive failure mechanism behind a rigid retaining wall, the work rate calculations were performed for determining pseudostatic and pseudo-dynamic solutions of limiting earth pressures. Four pseudodynamic approaches including the simple, improved, modified and full-coupled analyses were discussed. Remediation techniques such as installation of stabilizing piles or geosynthetics were also studied considering the simple, improved, modified and full-coupled pseudo-dynamic approach. Results from the analysis and centrifuge test show that they were effective in enhancing slope stability. Some centrifuge model tests have been conducted to investigate the earthquake effect on submarine slopes. A shaker driven by hydraulic power was used to simulate the earthquake shaking with a prescribed sinusoidal wave. Particle Image Velocimetry (PIV) technique was then applied to depict the soil deformation and slope failure mechanism. Results in a sense match those obtained from the proposed discretization-based kinematic analyses.
590 $a School code: 1883.
650 4 $a Geological engineering. $3 2122713
650 4 $a Geophysics. $3 535228
650 4 $a Soil sciences. $3 2122699
650 4 $a Civil engineering. $3 860360
653 $a Landslides
653 $a Slope instability
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690 $a 0543
690 $a 0467
690 $a 0481
710 2 $a National University of Singapore (Singapore). $3 3352228
773 0 $t Dissertations Abstracts International $g 81-11B.
790 $a 1883
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27988204