Evaluation of innovation lightweight fill in problematic soil

Ganasan, Reventheran (2016) Evaluation of innovation lightweight fill in problematic soil. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Construction of structures on soft soils gives rise to some difficulties in Malaysia and other country with soft soils, especially in settlement both in short and long term. The most critical geotechnical challenges are excessive settlement and differential settlement leading to hazardous and discomfort in road usage and distress in buildings. The focus of this research is to minimize the differential and non-uniform settlement on peat soil with the use of an innovative cellular mat. The behavior and performance of the lightweight material (in block form) was investigated and in particular the use as a fill in embankment on soft ground in both physical and numerical modelling. Peat soil, sponge and innovative cellular mat were used as physical modelling where else PLAXIS 2D was selected as the numerical modelling part whereby both of these modelling act as the main research material in this study. The initial part of this research (physical modelling) had taken place in monitoring in settlement behaviour thus it will be only done as laboratory testing. The laboratory model test was conducted in a steel tank of size 100cm (length) x 50cm (width) and 60cm (height). The bottom, back face and the sides of the tank were made of steel. The front wall of the test tank was fabricated from a 15mm thick perspex glass plate to observe failure mechanism. The uneven settlement with problem was uniquely monitored photographically using spot markers. For the numerical method, the data/input through past literature review and also through the testing done in peat from Parit Nipah had been applied in both Mohr Coulomb and Soft Soil constitutive of models thus comparing the occurrence of settlement behaviour including the presence of new innovative lightweight material. These physical and numerical modelling were carried out as to simulate the real problem and case study in Parit Yaani, Batu Pahat, Johor approaching to the bridge connected with embankment. The mini trial embankment test was built with the innovative cellular mats place underneath to identify the suitable cover depth thus propose in laying these new lightweight mats under the embankment surface in the future (real site/field testing). In the end of the research, the innovative cellular mat have been proven literally in both physical and numerical modelling in reducing the excessive and differential settlement up to 50% and 45% respectively compare to the flexible base and rigid base foundation. This has also improve the stiffness of soils as well as the porous contain in cellular structure which help in allowing water/moisture to flow through in or out without condition of floating.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
ID Code:9069
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:09 May 2017 15:34
Last Modified:09 May 2017 15:34

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