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GEO Technical Engineering Design - University Of Technology Sydney - Report Writing Assessment Answer
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Report Writing Assessment Answer
Assignment Task: Impact of Light Cementation and Addition of Recycled Fibres on Liquefaction and Post Liquefaction Resistance of Sands Introduction In nature, soils are commonly found with a degree of cementation, or it may be added to improve soil response under static or cyclic loading. The degree of cementation in nature or treated soils can vary ranging from very lightly cemented soil to strongly cemented soils where interparticle voids are filled with a cementing agent. Many researchers have considerably reported the dynamic behaviour, and liquefaction resistance of naturally and artificially cemented sands. Saxena et al. (1988b) using resonant column test showed that even a small degree of cementation would alter the dynamic moduli and damping ratio under low strain amplitude. Problem statement One of the challenging topics regarding designing different type of structures under earthquake loading is liquefaction. In the last few decades, in the strong earthquakes, the vast majority of damages to infrastructures, buildings, and lifeline facilities have been associated with liquefied soils. The liquefaction usually happens in saturated loose sandy and silty soils under common earthquakes while still there is a chance that dense sands become liquefy under large earthquakes. Outline This report consists of six chapters including introduction, literature review, research objectives and scope of work, methodology, results and discussion, and research plan and progress to date. In chapter 1, following a general background of the project, the problem statement is specified. Research objectives and outcomes This research project aims to investigate the effects of degree of cementation on the liquefaction, re-liquefaction and post-liquefaction resistance of lightly cemented sands as well as the effect of adding carpet fibre in improving specimens behaviour under cyclic loading. To achieve this goal, five specific objectives are formulated- To assess the liquefaction and post-liquefaction resistance of clean and lightly cemented sands
- To investigate the re-liquefaction resistance of clean and lightly cemented sands subjected to successive earthquake events
- To determine the effect of anisotropic consolidation on liquefaction and post-liquefaction behaviour of the specimens
- To study Liquefaction and post-liquefaction resistance of clean sand reinforced with carpet fibre
- To investigate liquefaction and post-liquefaction resistance of lightly cemented sand reinforced with carpet fibre
- The outcomes of this research study will be beneficial for designing different structure such as buildings, tunnels, bridges, and dam within or on top of these type of soils. The research will inevitably provide a better understanding of the behaviour of lightly cemented soils during cyclic loading evens.
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