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Mechanical Behavior of Gassy Silty Sand.

Zhang, Yan.

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Mechanical Behavior of Gassy Silty Sand.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Mechanical Behavior of Gassy Silty Sand./
Author:	Zhang, Yan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	204 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
Contained By:	Dissertation Abstracts International78-02B(E).
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10160468
ISBN:	9781369153750

Mechanical Behavior of Gassy Silty Sand.
Zhang, Yan.

Mechanical Behavior of Gassy Silty Sand. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 204 p.

Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2016.

Gassy sands can be encountered in a variety of geotechnical engineering cases. They may be found naturally in marine sediments, deltaic slopes or in sands treated with blast densification, air sparging and compaction piles.

ISBN: 9781369153750Subjects--Topical Terms:

860360
Civil engineering.

Mechanical Behavior of Gassy Silty Sand.
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020 $a 9781369153750
035 $a (MiAaPQ)AAI10160468
035 $a AAI10160468
040 $a MiAaPQ $c MiAaPQ
100 1 $a Zhang, Yan. $3 1035418
245 1 0 $a Mechanical Behavior of Gassy Silty Sand.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 204 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
500 $a Adviser: Richard J. Finno.
502 $a Thesis (Ph.D.)--Northwestern University, 2016.
520 $a Gassy sands can be encountered in a variety of geotechnical engineering cases. They may be found naturally in marine sediments, deltaic slopes or in sands treated with blast densification, air sparging and compaction piles.
520 $a As a special case of unsaturated soils, the gas phase of gassy sands exists in the form of occluded bubbles of such size that they fit within void spaces without distortion of the soil structure. Over the years, the mechanical behavior of gassy sands has been interpreted in the framework of Terzaghi's effective stress principle. However, there exists no direct experimental evidence to prove the validity of Terzaghi's effective stress principle for gassy sands. Furthermore, the combined effects of occluded gas and nonplastic fines on the mechanical behavior of sands remained uncertain. It is of considerable practical interests to establish a thorough understanding of the mechanical behavior of gassy silty sands.
520 $a An extensive laboratory experimental program was implemented to provide experimental evidence for the validity of Terzaghi's effective stress principle in gassy sands and to evaluate the effects of occluded gas and nonplastic fines on the mechanical behavior of sand.
520 $a Terzaghi's effective stress principle herein is validated by the results of globally undrained gassy tests and saturated, drained effective stress path (ESP) tests. In a gassy test, the effective stress was computed by assuming Terzaghi's effective stress principle valid. In an ESP test, the effective stress path obtained from the gassy test is applied to a saturated specimen with drainage lines opened. Two groups of gassy and ESP tests cover a degree of saturation (Sr) from 92% to 100%. The principle of effective stress requires that applying the same effective stress path results in the same volumetric versus axial strain response in both the gassy and ESP tests. Results of the stress-strain-strength of the gassy and ESP tests indicated that the Terzaghi's effective stress principle is valid for gassy soils with Sr between 92% and 100%.
520 $a To study the combined effects of occluded gas and nonplastic fines, a series of monotonic and cyclic triaxial tests were performed on gassy silty sands under globally undrained condition. Under both monotonic and cyclic loadings, the inclusion of occluded gas impeded the generation of excess pore pressure and enabled volumetric deformation under globally undrained condition. In monotonic tests, a decrease in the degree of saturation effectively impeded the generation of excess pore pressure. In cyclic tests, this increased the number of cycles to reach failure. An addition of nonplastic fines increased the collapsibility of a gassy sand at a given global void ratio. At the same level of Cyclic Stress Ratio (CSR), as nonplastic fine content increased, fewer cycles were needed to reach failure. The characteristics of gassy silty sands were evaluated using bender element measurements. The small-strain shear modulus of silty sand were evaluated based on shear wave velocity measurements. The effect of occluded gas on shear wave and bar wave velocities were studied. While shear wave velocity was immune to the change of degree of saturation, the presence of occluded gas dramatically decreased the bar wave velocity in gassy silty sands. The limitation of using bender element-generated bar wave in the study of gassy sand was also discussed.
590 $a School code: 0163.
650 4 $a Civil engineering. $3 860360
650 4 $a Mechanics. $3 525881
650 4 $a Geotechnology. $3 1018558
690 $a 0543
690 $a 0346
690 $a 0428
710 2 $a Northwestern University. $b Civil and Environmental Engineering. $3 1021864
773 0 $t Dissertation Abstracts International $g 78-02B(E).
790 $a 0163
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10160468