000			03634nam a2200397 4500
005			20260818095326.0
008			080598 th eng
035			_a.b10231547
099		9	_aAIT Thesis no. AE-93-2
100	1		_aPeng, Hong Jian
245	1	0	_aEffects of speed and aspect ratio on soil reactions caused by vertical tines in Bangkok clay soil
260			_aBangkok : _bAsian Institute of Technology, _c1993
300			_a97 leaves : _bill.
490	1		_aThesis ; _vno. AE-93-2
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
500			_aA thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering.
520			_aThe effects of speed and aspect ratio on the soil reactions under the action of flat vertical tines in clay soil were studied. The experiments were conducted in a laboratory soil bin with the vertical tines of aspect ratio 0.5, 1 and 2; at two depth of operation, 10 cm and 15 cm; at three speeds of 0.11, 0.2 and 0.33 mis and in two moisture contents, 5.83 and 16. 73. It was observed that both horizontal and vertical soil reactions were cyclic and in phase with each other for all the combinations of speed, aspect ratio and moisture content tested. The horizontal and vertical forces (peak value, trough values and average values) were found to increase with an increase of aspect ratio in both moisture contents. The average values of forces in moist soil were hig her than in the dry soil. The soil failure wavelength increased linearly with the increase of aspect ratio at a given depth. The rate of increase showed a similar trends at two operating depths. The specific draft decreased as the aspect ratio increased due to the change of soil failure from three dimensional to two dimensional. The specific draft at 15 cm depth was less than at 10 cm depth. The horizontal and vertical forces increased as the operating speed increased. The rate of increase showed a trend similar to linear or logarithmic. The rate of increase being more in moist soil than in dry soil. The tool forward s peeds used in this study did not show a definite trend of change in soil failure wavelength. The specific draft increased as the tool forward speed increased and the trend of increase was similar to the soil shear strength-deformation relation. The soil moisture content was found to have a significant effect on soil reactions both in terms of forces and soil failure frequency. With an increase of soil moisture content from 5.83 to 16.73, both the forces and ·soil failui:e wavelength increased rapidly.
650		0	_aSoil mechanics _xThailand _xBangkok
700	1		_aSalokhe, Vilas M., _eChairperson
700	1		_aClough, David Gee, _eExamination committee
700	1		_aSingh, Gajendra, _eExamination Committee
700	1		_aGupta, C. P., _eExamination committee
710	2		_aThe Japanese Government, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AE-93-2
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B15991
907			_a.b10231547 _bmnait _cx
902			_a240329
998			_b2 _c951012 _dm _ea _fx _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
909			_aBarcode : 30050120577951 _bCREATED : 2013-10-07 _cRECORD # : i12736235 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050120375950 _bCREATED : 2016-01-06 _cRECORD # : i13010505 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c35365 _d35365