ECONOMIC DESIGN OPTIMIZATION OF PREFABRICATED VERTICAL DRAIN CONSTRUCTION

Putra, Alvin Santo (2021) ECONOMIC DESIGN OPTIMIZATION OF PREFABRICATED VERTICAL DRAIN CONSTRUCTION. S1 thesis, Universitas Atma Jaya Yogyakarta.

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Abstract

Soft soil, a soil which is considered as poor soil as it has low shear strength, low permeability, and time-dependent settlement causing consolidation phenomena, currently exist in major parts of unused land. In order to solve consolidation problem in soft soil, ground improvement method called vertical drain has been developed. One of the better methods of ground improvement is called Prefabricated Vertical Drain (PVD), as it could resist shear load from the soil and considered cheaper compared to other alternatives. However, in practice, the installation of PVD is still producing high amount of overall construction cost, which may raise it up to 30%. Thus, in order to minimalize the fluctuation of cost in construction cost, optimization of PVD is being researched in this Study. Optimization in construction is a method that consider the optimum performance of structure, indicated by fulfilling design criteria needed for the structure, while producing least cost possible for the project. In this study, the optimization performed is exact optimization solution for PVD installation. The optimization used PVD dimension length and spacing to determine the minimum cost as optimization target, with design criteria of Degree of consolidation reaching ≥95% in one year period. The process of optimization will then be coded using MATLABR2013a, using data from previous study regarding optimization of PVD. The result of the optimization in this study is an economic model of PVD modelled in MATLAB software, with the dimension of length = 33 m and spacing = 2 m, resulting in 95.2% of Degree of Consolidation in half year period. Furthermore, sensitivity study is also being performed, to determine which soil properties affect PVD installation cost, in order to choose the most optimum soil treatment for other projects. The sensitivity study determines that the soil properties affecting PVD installation cost the most comes from soil Coefficient of Volume Change (Mv) and Vertical Coefficient of Permeability (kV).

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