000			03376nam a2200409 4500
005			20260818213919.0
008			th eng
035			_a.b11533481
099		9	_aAIT Thesis no. GE-95-01
100	1		_aParameswaran, Y.
245	1	0	_aShield behavior in multi-layer ground
260			_aBangkok : _bAsian Institute of Technology, _c1996
300			_a108 leaves
490	1		_aThesis ; _vno. GE-95-01
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Civil Engineering
502			_aThesis (M. Eng.) - Asian Institute of Technology, 1996
520			_aThis research study is confined with developing a three dimensional Simulator of a cylindrical shield in multi-layered ground based on analytical formulation taking account of self weight, buoyancy, jack force, ea1th pressure distribution on cutter face which is function of velocity of shield and rotational speed of cutter face, and the earth pressure distribution on skin plate which is function of displacement of soil. By considering the equilibrium conditions of all these forces and moments, the displacement, rotation of shield and the mobilized coefficient of friction is determined. The Modified Marquart method of optimization is used for solving the non-linear equations. To determine the actual stress distribution on cutter face and skin plate , it is divided into a number of small elements. The required number of elements and the time interval between two successive steps is investigated from the excavated area. At each steps, the layer number corresponding to each calculation point is determined by position vector of each point. From this research, it has been found that shield is behave as unsteady state when it is in multi-layered ground and it becomes to steady state when the whole pait of shield goes into the single layer. To investigate the influence of various parameter, the sensitivity analysis is carried out by fixing all input parameters except only one parameter as variable. The over all scheme of analysis is done by developing a computer program coded in FORTRAN 77.
650	1	0	_aShields (Geology)
700	1		_aSugimoto, M., _eChairperson
700	0		_aNopodol Phein-wej, _eExamination Committee
700	1		_aBergado, Dennes T., _eExamination Committee
710	2		_aThe Government of Norway, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. GE-95-01
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B15050
907			_a.b11533481 _bmnait _cv
902			_a240405
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