Memorial University DAI: An analysis for braced excavations in clay

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Title	An analysis for braced excavations in clay
Author	Xia, Huanliang, 1963-
Description	Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. Engineering and Applied Science
Date	1999.
Pagination	xxiv, 373 leaves : ill. (some col.) ; 28 cm.
Subject	Excavation--Mathematical models; Clay soils;
Degree	Ph.D.
Degree Grantor	Memorial University of Newfoundland. Faculty of Engineering and Applied Science
Discipline	Engineering and Applied Science
Language	Eng
Notes	Bibliography: leaves 360-373.
Abstract	This thesis studies braced excavations in clay with centrifuge tests and finite element analyses. -- Centrifuge experiments of 72 g are carried out to investigate earth pressures on the back of sheet piles, forces iu the struts, the surface settlement and bottom heaving. The simulated depth of excavation is 11.5 m and the width is 17.3 m. The struts are applied before excavation for the convenience of the tests. Heavy liquid of sodium polytungstate (3Na2 WO4.9WO3.H2O) is used to simulate the soil which would be excavated. The excavations are simulated by draining the liquid during the tests. -- The details of designing the model, preparing the soil, assembling the equipment and experimental procedures are described. Compression and triaxial tests are also carried out to obtain the mechanical parameters for the numerical analysis. -- A finite element analysis is carried out for the model and the results are compared with experimental data and established methods. The Cam-clay model is used for the soil. Eight node rectangular elements with pore pressures on the corners are used for the soil and block elements are used for the sheet piles. The results show that the finite element may predict most behaviour of the excavation. -- The finite element model is used to perform parametric studies where each layer of struts is applied after the soil of the corresponding layer is excavated. The effects of variation of the properties of soil, the stiffness of sheet piles and struts and the vertical distances between the struts are investigated.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a1358117
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(34.43 MB) -- http://collections.mun.ca/PDFs/theses/Xia_Huanliang.pdf
CONTENTdm file name	20870.cpd