Prediction of surcharge build-up in front of flat tine in dry compact sand | |
| Author | Wu, Weibin |
| Call Number | AIT Thesis no. AE-92-2 |
| Subject(s) | Tillage Soil mechanics |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The surcharge build- up under the action of flat vertical tines operating at quasi -static conditions in dry compact sandy soil was studied . Surcharge build up in front of the tines was found to increase as tine move d forward and became stabilize d after several soil failure blocks occurred. Surcharge height was found to increase rapidly and become almost constant when the dynamic stabilize surcharge was formed. It was the same for both flush and projecting tines. The trend for surcharge height look like a exponential curve for all tines under this study. The stabilized surcharge took a distinct shape . 'The front portion was close to half of a parabola shape and the rear portion was a combination of a triangular and rectangular shapes. 'The study of surcharge build- up corresponding to soil reaction showed that the surcharge components contributed significantly to the horizontal soi1 reaction in dry compact sandy soil. It was also found that surcharge effects on the draft were more than the actua1 weight above free soil surface . Without surcharge effect, the initial soi1 failure force was always greater than that of the later soil failure force even after stabilized surcharge approached . It was found that the projecting tines were not only affect the shape of the surcharge but also contributed more significantly to draft than that of flush tines under the same operating depth and width. Base on the distinct shape of the surcharge, models with t he basic dimensions of the tines were developed to predict the stabilized surcharge parameters and the stabilized surcharge weight. The predicted values followed almost the same trend with the observed data and was in reasonable agreement with the observed data. |
| Year | 1992 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Salokhe, Vilas M. |
| Examination Committee(s) | Singh, Gajendra ;Gee-Clough, D. ;Gupta, Chandra P. ;Maohua, Wang |
| Scholarship Donor(s) | Government of Japan ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1992 |