Redefining the standard compaction test to better describe the usage of cotton picking machines on Australian vertosols

Wilson, Ronald J (2015) Redefining the standard compaction test to better describe the usage of cotton picking machines on Australian vertosols. [USQ Project]


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The aim of this project is to investigate the applicability of the standard load used in the Uniaxial Compression Test to describe the impact of large harvesting machines, such as the John Deere 7760 cotton picker (JD7760), on the soil. In the past the Uniaxial Compression Test with a load of 200 kPa has been used to generate a reference maximum bulk density. This test has been used as the Proctor Test was seen to generate a load greater than that typically experienced under farm machinery.

However, due to a vast increase in the size and weight of farming machinery it is not uncommon to find soils that have experienced a loading of as much as 600 kPa (JD7760). As such, there is a need to either redefine the load used in the Uniaxial Compression Test or revert to the Proctor Test such that the reference compaction generated is representative of that experienced in the field.

In order to achieve the aforementioned aim a review of the pertinent literature has been undertaken. Following this samples were gathered from a variety of sites around South East Queensland.

SoilFlex was used to model the distribution of stresses within the soil during the application of a 600 kPa load. (600 kPa being taken as the standard load applied by a JD7760).The results from this analysis are then used to determine a range of applicable loading values (200-600 kPa). Using these values a series of Uniaxial Tests was conducted using a combination of principals derived from articles written by Häkansson (1990) and Suzuki (2013). In addition to this the Proctor Test was undertaken to provide further comparisons.

The results from these tests were then compared to the in situ bulk density for each location, allowing for the calculation of a degree of compaction for each loading. Some error was included in the testing that could be resolved through further testing. Despite this the correlations and trends shown within the data support the recommendation of the 1600 kPa proctor test as applicable for simulating the compaction caused by a JD7760.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering project
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Mclean Bennett, John
Date Deposited: 06 Jun 2016 06:14
Last Modified: 08 Jun 2016 03:42
Uncontrolled Keywords: Vertosol, Compaction, Standard Test, Cotton picking machines
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400599 Civil engineering not elsewhere classified

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