東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Stability of Skirted Gravity Foundations on Very Soft Clay.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Stability of Skirted Gravity Foundations on Very Soft Clay./
作者:	Tani, Kazuo.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1990,
面頁冊數:	329 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-11, Section: C.
Contained By:	Dissertations Abstracts International80-11C.
標題:	Geological engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13893709
ISBN:	9781392123003

Stability of Skirted Gravity Foundations on Very Soft Clay.
Tani, Kazuo.

Stability of Skirted Gravity Foundations on Very Soft Clay. - Ann Arbor : ProQuest Dissertations & Theses, 1990 - 329 p.

Source: Dissertations Abstracts International, Volume: 80-11, Section: C.

Thesis (Ph.D.)--The University of Manchester (United Kingdom), 1990.

The thesis begins with a brief overview of some of the foundation design problems encountered for gravity structures placed on soft clay subjected to combinations of static/cyclic loads under undrained conditions, and describes the importance of the influence of strength variation with depth (Chapter 1). A series of model foundation tests (F-TEST) was conducted in the centrifuge to investigate the stability of a circular skirted foundation on very soft clay whose undrained shear strength increases linearly with depth. While Chapter 2 reviews the stability of foundations, the significance of employing the centrifuge as a powerful physical modelling technique for this study is discussed in Chapter 3. A seepage-induced consolidation technique was used successfully to produce clay beds with shear strength increasing with depth in the laboratory (Chapters 3,6,8). Since accurate evaluation of the strength profile (especially of the top extremely soft layer) in the model bed is absolutely essential, cone penetration test (CPT) technique in the centrifuge has been developed to obtain geotechnical information continuously with depth. A series of CPTs (CP-TEST) in homogeneous clay beds was conducted to establish the correlation between cone resistance qc and undrained shear strength Cu (Chapter 7). This empirical relationship which takes account of the influences of penetration rate, stress level and the error associated with the seal in the gap, has proved itself to be useful in evaluating the undrained shear strength profile in non-homogeneous beds (Chapter 8). A circular footing (diameter D = 304 mm) with a peripheral skirt 30 mm deep was used for F-TEST under static vertical and static/cyclic horizontal loadings. The results have provided general information about soil behaviour under various loading conditions, which can be used to develop and check the validity of theoretical models (Chapter 8). The failure of non-homogeneous beds under static vertical load was punching shear. This failure mechanism was confined to shallow depths in order to avoid shearing of clay quickly strengthening with depth. On the other hand, under static horizontal loading, failure took place by sliding with a circular shear surface inside the skirt similar to the case for homogeneous beds. Therefore, the influence of the shear strength increasing with depth may be negligible in this respect. Moreover for cyclic horizontal loading, the failure was observed by large cyclic horizontal displacement associated with shakedown settlement for h/D =0.3 (h : moment arm) employed in this project. The shape of shear zones appears to depend on the vertical load. Plasticity theory was used to analyse plane strain and axisymmetric conditions in order to evaluate the influence of strength increasing linearly with depth on bearing capacity (Chapter 4). Computed results are presented as an extended set of charts, introducing the effect of increasing strength into the framework of the existing bearing capacity theories consistently. With a limited number of results, the experiments have proved the validity of the theory.

ISBN: 9781392123003Subjects--Topical Terms:

2122713
Geological engineering.
Subjects--Index Terms:

Soft clays

Stability of Skirted Gravity Foundations on Very Soft Clay.
LDR:04124nmm a2200313 4500 001 2349250
005 20220920133701.5
008 241004s1990 ||||||||||||||||| ||eng d
020 $a 9781392123003
035 $a (MiAaPQ)AAI13893709
035 $a (MiAaPQ)DIS001543_00003304
035 $a AAI13893709
040 $a MiAaPQ $c MiAaPQ
100 1 $a Tani, Kazuo. $3 3688655
245 1 0 $a Stability of Skirted Gravity Foundations on Very Soft Clay.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1990
300 $a 329 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-11, Section: C.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--The University of Manchester (United Kingdom), 1990.
520 $a The thesis begins with a brief overview of some of the foundation design problems encountered for gravity structures placed on soft clay subjected to combinations of static/cyclic loads under undrained conditions, and describes the importance of the influence of strength variation with depth (Chapter 1). A series of model foundation tests (F-TEST) was conducted in the centrifuge to investigate the stability of a circular skirted foundation on very soft clay whose undrained shear strength increases linearly with depth. While Chapter 2 reviews the stability of foundations, the significance of employing the centrifuge as a powerful physical modelling technique for this study is discussed in Chapter 3. A seepage-induced consolidation technique was used successfully to produce clay beds with shear strength increasing with depth in the laboratory (Chapters 3,6,8). Since accurate evaluation of the strength profile (especially of the top extremely soft layer) in the model bed is absolutely essential, cone penetration test (CPT) technique in the centrifuge has been developed to obtain geotechnical information continuously with depth. A series of CPTs (CP-TEST) in homogeneous clay beds was conducted to establish the correlation between cone resistance qc and undrained shear strength Cu (Chapter 7). This empirical relationship which takes account of the influences of penetration rate, stress level and the error associated with the seal in the gap, has proved itself to be useful in evaluating the undrained shear strength profile in non-homogeneous beds (Chapter 8). A circular footing (diameter D = 304 mm) with a peripheral skirt 30 mm deep was used for F-TEST under static vertical and static/cyclic horizontal loadings. The results have provided general information about soil behaviour under various loading conditions, which can be used to develop and check the validity of theoretical models (Chapter 8). The failure of non-homogeneous beds under static vertical load was punching shear. This failure mechanism was confined to shallow depths in order to avoid shearing of clay quickly strengthening with depth. On the other hand, under static horizontal loading, failure took place by sliding with a circular shear surface inside the skirt similar to the case for homogeneous beds. Therefore, the influence of the shear strength increasing with depth may be negligible in this respect. Moreover for cyclic horizontal loading, the failure was observed by large cyclic horizontal displacement associated with shakedown settlement for h/D =0.3 (h : moment arm) employed in this project. The shape of shear zones appears to depend on the vertical load. Plasticity theory was used to analyse plane strain and axisymmetric conditions in order to evaluate the influence of strength increasing linearly with depth on bearing capacity (Chapter 4). Computed results are presented as an extended set of charts, introducing the effect of increasing strength into the framework of the existing bearing capacity theories consistently. With a limited number of results, the experiments have proved the validity of the theory.
590 $a School code: 1543.
650 4 $a Geological engineering. $3 2122713
650 4 $a Civil engineering. $3 860360
653 $a Soft clays
690 $a 0466
690 $a 0543
710 2 $a The University of Manchester (United Kingdom). $b Department of Engineering. $3 3688656
773 0 $t Dissertations Abstracts International $g 80-11C.
790 $a 1543
791 $a Ph.D.
792 $a 1990
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13893709