AI SearchEffect of slip, spacing and moisture content on lug forces in Bangkok clay soil
Tran, Thi Hong
Effect of slip, spacing and moisture content on lug forces in Bangkok clay soil - Bangkok : Asian Institute of Technology, 1993 - 65 leaves : ill. - Thesis ; no. AE-93-9 . - Asian Institute of Technology. Thesis ; no. AE-93-9 .
A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering.
Thesis (M.Eng.) - Asian Institute of Technology, 1993
This st u dy was conducted to inv es ti gate the effect of low slip, lu g spacing a nd moisture co ntent on forces producted by cage wheel lugs. Experime nt s were conducted in a l aboratory soi l bin having Bangkok clay soil to measure the forces under model cage wheel lu gs. A specia l transducers were fabricated to meas ur e the so il perpendicular and radial reactions on the lugs. The s lip s were varied from 53, 103, 153, 203 to 253.T he force measurements on both lu gs were done at 6.33, 27.43 and 50.93 soil moi sture content. The lu g spaci n gs were varied to 20 a n d 30 a nd 40 deg. The meas ur ed perpendicular and radial forces were conver ted to lu g pull a nd lift forces. It was observed that the perpendicular and radial as well as pull a nd lift forces acti n g on the first lug were higher than the forces on the second lug. The perpendicular, pull and lift forces increased after lu g entry into the soil and after attaining a certain peak value they decreased and obtained a zero value at lu g exit. The radial force increased initially as lu g enter the soil and after attaining a positiv e peak value it decreased continuously attaining a negative peak a nd then become zero at lug exit. The radial force was mu ch smaller than the perpendicular but calcu l ated lift force was hi g h er than pull force . The increase of the slip up to 25% caused increase in lu g force s on bot h lu gs . The increase in the soi l moisture conte nt from 6. 3% to 27.43 caused increase in lu g forces on both lu gs but furth er incre ase in mois ture content to 50.9% decreased the lug forces. The lug spacing did not s how any effect on the first lu g forces, but it s how ed s ignifi ca nt effect on the second lu g forces. The increase in lug s pacing increased lug forces at all slips and moi sture contents . The ratio of forces produced under the second lu g to the force s under the fir s t lu g d ecrease d as the lu g s lip increased. I nc rease in lug slip al so increased the lug forces at a n y given spaci n g and moisture content. The pull and lift forces und er multiple lu gs were predicted and it was found that these force s vary in cyc li c nature. It was found that the variation of the output forces can be reduced significant ly by using inclined lugs. At the sa me lug spacin g , s lip and soil moi sture co nt e nt s, the variation of lift can be red u ced by 403, t h e var i ation of pull can be reduced by 2403.
Soil mechanics--Thailand--Bangkok
Effect of slip, spacing and moisture content on lug forces in Bangkok clay soil - Bangkok : Asian Institute of Technology, 1993 - 65 leaves : ill. - Thesis ; no. AE-93-9 . - Asian Institute of Technology. Thesis ; no. AE-93-9 .
A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering.
Thesis (M.Eng.) - Asian Institute of Technology, 1993
This st u dy was conducted to inv es ti gate the effect of low slip, lu g spacing a nd moisture co ntent on forces producted by cage wheel lugs. Experime nt s were conducted in a l aboratory soi l bin having Bangkok clay soil to measure the forces under model cage wheel lu gs. A specia l transducers were fabricated to meas ur e the so il perpendicular and radial reactions on the lugs. The s lip s were varied from 53, 103, 153, 203 to 253.T he force measurements on both lu gs were done at 6.33, 27.43 and 50.93 soil moi sture content. The lu g spaci n gs were varied to 20 a n d 30 a nd 40 deg. The meas ur ed perpendicular and radial forces were conver ted to lu g pull a nd lift forces. It was observed that the perpendicular and radial as well as pull a nd lift forces acti n g on the first lug were higher than the forces on the second lug. The perpendicular, pull and lift forces increased after lu g entry into the soil and after attaining a certain peak value they decreased and obtained a zero value at lu g exit. The radial force increased initially as lu g enter the soil and after attaining a positiv e peak value it decreased continuously attaining a negative peak a nd then become zero at lug exit. The radial force was mu ch smaller than the perpendicular but calcu l ated lift force was hi g h er than pull force . The increase of the slip up to 25% caused increase in lu g force s on bot h lu gs . The increase in the soi l moisture conte nt from 6. 3% to 27.43 caused increase in lu g forces on both lu gs but furth er incre ase in mois ture content to 50.9% decreased the lug forces. The lug spacing did not s how any effect on the first lu g forces, but it s how ed s ignifi ca nt effect on the second lu g forces. The increase in lug s pacing increased lug forces at all slips and moi sture contents . The ratio of forces produced under the second lu g to the force s under the fir s t lu g d ecrease d as the lu g s lip increased. I nc rease in lug slip al so increased the lug forces at a n y given spaci n g and moisture content. The pull and lift forces und er multiple lu gs were predicted and it was found that these force s vary in cyc li c nature. It was found that the variation of the output forces can be reduced significant ly by using inclined lugs. At the sa me lug spacin g , s lip and soil moi sture co nt e nt s, the variation of lift can be red u ced by 403, t h e var i ation of pull can be reduced by 2403.
Soil mechanics--Thailand--Bangkok