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Effects of Soil Particle Grading and Structural Properties on the Soil-Structural Interface Shearing Behavior.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of Soil Particle Grading and Structural Properties on the Soil-Structural Interface Shearing Behavior./
Author:	Chen, Weibin.
Description:	1 online resource (187 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28774863click for full text (PQDT)
ISBN:	9798492784744

Effects of Soil Particle Grading and Structural Properties on the Soil-Structural Interface Shearing Behavior.
Chen, Weibin.

Effects of Soil Particle Grading and Structural Properties on the Soil-Structural Interface Shearing Behavior. - 1 online resource (187 pages)

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--University of Macau, 2021.

Includes bibliographical references

Many problems in geotechnical engineering, such as pile foundation-soil contact, soil-geosynthetics interface, and soil-soil nail interaction, etc. involve local interaction between granular materials and structure. The problem of determining how the shearing mechanism governs the overall behavior of the composite system during quasi-static shearing is of considerable significance to civil engineering, material science, geophysics and granular physics. The thesis is related to a parametric study of the soil-structural interface shearing behavior based on the numerical simulations of interface shear test, which is conducted from the perspectives of soil particle grading and structural properties.In this study, first, by controlling the same relative density for each specimen, a series of interface shear tests with different particle gradings was simulated by the Discrete Element Method (DEM). Second, a complete set of morphology parameters in accordance with standard ISO 4287 (ISO, 2009) was applied to quantify 240 random profiles of concretes. The random surface was imported into DEM software to fulfill the interface shear test. Third, it is attempted to investigate the effect of structural principal roughness direction on the soil-structure interface shearing behavior based on DEM simulation. At last, it is intended to study the effect of structural hardness on the shearing behavior of a sand-smooth geomembrane interface based on a coupled model.The results show that the specimen with lower uniformity coefficient can produce a higher shear resistance and a higher dilatancy. The specimen with lower uniformity coefficient suffers more change in the coordination number and induces higher contact anisotropy than that with higher uniformity coefficient, as a result, a higher interface shear strength and a higher dilatancy are found. An optimal model based on relevant morphology parameters was developed using genetic algorithm and was furtherly expressed by a formula, which is compared with the existing predicted formulas. The evolutions of microscale properties inside and outside the localized shear band, such as the coordination number and material fabric provide a physical meaning or an explanation for the consistent macroscale shearing behavior of granular soil-structure interface at a microscale level. In addition, the results demonstrate that there is a high level of coupling effect between normal stress and surface hardness on the interface strength. No shear band is formed during shearing for a sand-smooth geomembrane interface. The shear resistance of sand-smooth geomembrane interface relies on interface indentations and characteristics rather than on the formation of shear band.

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

Mode of access: World Wide Web

ISBN: 9798492784744Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Discrete Element MethodIndex Terms--Genre/Form:

542853
Electronic books.

Effects of Soil Particle Grading and Structural Properties on the Soil-Structural Interface Shearing Behavior.
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500 $a Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
500 $a Advisor: Zhou, Wanhuan.
502 $a Thesis (Ph.D.)--University of Macau, 2021.
504 $a Includes bibliographical references
520 $a Many problems in geotechnical engineering, such as pile foundation-soil contact, soil-geosynthetics interface, and soil-soil nail interaction, etc. involve local interaction between granular materials and structure. The problem of determining how the shearing mechanism governs the overall behavior of the composite system during quasi-static shearing is of considerable significance to civil engineering, material science, geophysics and granular physics. The thesis is related to a parametric study of the soil-structural interface shearing behavior based on the numerical simulations of interface shear test, which is conducted from the perspectives of soil particle grading and structural properties.In this study, first, by controlling the same relative density for each specimen, a series of interface shear tests with different particle gradings was simulated by the Discrete Element Method (DEM). Second, a complete set of morphology parameters in accordance with standard ISO 4287 (ISO, 2009) was applied to quantify 240 random profiles of concretes. The random surface was imported into DEM software to fulfill the interface shear test. Third, it is attempted to investigate the effect of structural principal roughness direction on the soil-structure interface shearing behavior based on DEM simulation. At last, it is intended to study the effect of structural hardness on the shearing behavior of a sand-smooth geomembrane interface based on a coupled model.The results show that the specimen with lower uniformity coefficient can produce a higher shear resistance and a higher dilatancy. The specimen with lower uniformity coefficient suffers more change in the coordination number and induces higher contact anisotropy than that with higher uniformity coefficient, as a result, a higher interface shear strength and a higher dilatancy are found. An optimal model based on relevant morphology parameters was developed using genetic algorithm and was furtherly expressed by a formula, which is compared with the existing predicted formulas. The evolutions of microscale properties inside and outside the localized shear band, such as the coordination number and material fabric provide a physical meaning or an explanation for the consistent macroscale shearing behavior of granular soil-structure interface at a microscale level. In addition, the results demonstrate that there is a high level of coupling effect between normal stress and surface hardness on the interface strength. No shear band is formed during shearing for a sand-smooth geomembrane interface. The shear resistance of sand-smooth geomembrane interface relies on interface indentations and characteristics rather than on the formation of shear band.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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650 4 $a Geotechnology. $3 1018558
653 $a Discrete Element Method
653 $a Shearing behavior
653 $a Interface indentations
653 $a Geomembrane interface
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690 $a 0428
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of Macau. $b Civil and Environmental Engineering. $3 3694006
773 0 $t Dissertations Abstracts International $g 83-05B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28774863 $z click for full text (PQDT)