000			04115nas|a2200445 i 4500
005			20260818170236.0
008			191199s1999 th uu m rtt 00| a1eng d
035			_a.b11764983
099		9	_aAIT Thesis no. GE-98-26
100	1		_aNg, Hoe Boon
245	1	2	_aA numerical analysis of top down deep excavation in Metropolitan Taipei
260			_aBangkok : _bAsian Institute of Technology, _c1999
300			_a131 leaves
490	1		_aThesis ; _vno. GE-98-26
500			_aA thesis proposal submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1999
520			_aFinite element analyses are used to study the performance of diaphragm walls for top-down deep excavation in Taipei subsoil. A two-dimensional finite element program, PLAXIS was used for back-analyzing the performance of a "Full Scale" top-down deep excavation in Taipei. In which, an undrained analysis incorporated with groundwater calculation was performed. The results of FEM prediction were found in close agreement with the field observation in term of lateral wall movement, ground surface settlement, lateral earth pressure distribution, bending moments of diaphragm wall and pore water pressure at various zones of excavation. Meanwhile, stress paths at various zones of excavation are established for deep excavation in Taipei subsoil. Finally, a series of parametric studies were carried out based on the back-analyzed parameters and average properties of Taipei subsoil to investigate the effects of wall and support stiffness, wall embedment depth, depth of unsupported excavation and surcharge load on the performance of diaphragm walls. The aspects of wall performance evaluated in the parametric studies including lateral wall movement, ground surface settlements and wall bending moments. The increasing of wall stiffness is not effective in limiting the development of wall and ground movement. The early installation of lateral support could minimize the potentially large wall and ground movements. Besides, an unsupported excavation could induce negative wall bending moment that is generally increased with the unsupported depth. Furthermore, the support stiffness has only a minor effect on the performance of a top-down deep excavation in Taipei subsoil. Moreover, increasing the wall penetration depth could not help in reducing the wall movement. Finally, the existence of surcharge adjacent to the excavation is necessary to be considered as it could significantly affect the magnitude and shape of wall deformation and ground settlement.
650		0	_aExcavation _zTaiwan _zTaipei
700	1		_aDer-Guey Lin, _eChairperson
700	1		_aOtsu, Hiroyasu, _eChairperson
700	1		_aBalasubramaniam, A.S., _eExamination Committee
710	2		_aPartial Scholarship, _eScholarship donor
710	2		_aLee Foundation, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. GE-98-26
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B12522
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