Compaction density of partially saturated soils

Hollingshead, Fraser (2022) Compaction density of partially saturated soils. [USQ Project]

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Soil compaction is the process of reducing the amount of air between soil particles which contributes to improved stability for construction developments. This dissertation examines the compaction density of partially saturated soils and the effects of air-void ratios on soil compaction through a series of laboratory tests and theoretical analyses. This project provides analytical and numerical data that is imperative to increasing the understanding and predictability of soil behaviours due to gradually increasing moisture under both standard and modified compaction efforts. Additionally, a theoretical family of compaction curves are investigated and the information is used to analyse the behaviour of fine-grained (with clay and silt) and medium and coarse-grained soil types. This is important because conducting laboratory testing of different soil types and compositions allows for comparisons and real-world applications between field compaction and fill material. To understand and achieve the aim and objectives of this dissertation, a review of the literature was undertaken with a significant focus on producing modelling compaction curves from data obtained during laboratory testing.

The laboratory compaction tests conducted followed the requirements of Australian Standards to deliver results from a civil engineering laboratory. The three types of soils tested were sandy clay, gravelly sand and clayey sand and were obtained from a soil company in Tingalpa, QLD. Soil compaction tests were performed following standard proctor compaction test using the 2.7 kg rammer method AS 1289.5.1.1:2017 and the modified proctor compaction test using the 4.9 kg rammer method AS 12895.2.1:2017 (Standards Australia 2017). Atterberg Limits including the liquid limit - Casagrande method AS1289.3.1.1:2009 and plastic limit method AS1289.3.2.1:2009 were also applied (Standards Australia 2009). Finally, the Particle Size Distribution test AS1289.3.6.1:2009 using the sieve analysis was performed and analysed (Standards Australia 2009). The effects of void space on compaction tests were investigated and the results for these soil types are relevant and similar to those found in the field.

The results from these tests were analysed and compared to previous research work and numerical results and calculations are shown. The results found the optimum moisture content and dry density of soils. This research provides results that demonstrate the necessity to perform an analysis of the effects air-void ratio has on compaction testing.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Engineering (1 Jan 2022 -)
Supervisors: Alehossein, Habib
Qualification: Bachelor of Engineering (Honours) (Civil)
Date Deposited: 19 Jun 2023 05:18
Last Modified: 20 Jun 2023 01:12
Uncontrolled Keywords: soil compaction; compaction density; saturated soils

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