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- W799703417 abstract "The use of the trenchless plough drainage implement has increased in thepast few years due to its efficiency and cost advantages over othermethods. However, the performance of these machines when working in fieldswith irregular soil conditions is not yet satisfactory. It is importanttherefore to study the soil parameters and conditions which could affectthe implement behaviour under these circumstances.Therefore, a detailed investigation of the soil reaction forces actingupon a scale model of the trenchless plough was conducted undercontrolled conditions in a soil laboratory. The model was tested firstunder restricted conditions of movement, in order to observe and determineall the possible soil reaction forces.The tine, due to its geometric characteristics, was classified as a verynarrow tine, and an existing model to predict the soil reaction forceacting on the front face of these tines was extended to predict the forceson the sides. Since the length of the failure plane ahead of the tine isoften required in the investigation of the soil reaction forces, amathematical solution based on the Coulomb principle of Passive EarthPressure was presented to estimate the soil failure pattern. There wasgood agreement between the values of the angle of the shear planepredicted by this method and the experimental data obtained from theglass sided tank tests.Dynamic tests were conducted with the implement assembled with a longfloating beam arrangement assisted by a small link (free-link), usedbetween the hitch-point and the pivoted end of the beam. These testsrevealed that, when working over irregular soil conditions a better gradecontrol can be obtained if the hitch-point is kept at constant level inreference to a desired line. In the case where field irregularitiespersist for long (step inputs), corrections in the hitch-point heightmight be necessary. These tests show that the implement depth changes indifferent proportion in relation to the hitch-point height. Where nocontrol is imposed on the hitch-point, the path of the implement isattenuated in relation to the hitch-point position, where better resultsare obtained for high frequency of the hitch-point.A mathematical solution based on these findings and on the dynamic balanceof the forces acting on the system was presented. Since it is aninteractive method and requires long and repetitive calculations, acomputer programme was developed and used to predict the response of theimplement under these uneven conditions. Good agreement between data andestimated values suggested that the method is acceptable." @default.
- W799703417 created "2016-06-24" @default.
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- W799703417 date "1985-08-01" @default.
- W799703417 modified "2023-10-03" @default.
- W799703417 title "An investigation into the grade dynamics of drainage implements" @default.
- W799703417 hasPublicationYear "1985" @default.
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