STUDI TRANSFER BEBAN PONDASI DANGKAL DENGAN INKLUSI PADA KONDISI AXISYMMETRIC

• Main Author: Adha, Idharmahadi
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/4538
• Institution: Institut Teknologi Bandung

<b>Abstrak</b><p align="justify">One of shear failure mechanism for bearing capacity of shallow foundation is Prandtl's theory of plastic failure. The theory was applied by some authors, as Terzaghi, Meyerhof and Hansen. Numerical solutions of failure zone were presented by Sokolovskii for plane strain conditions and Cox for axisymmetric conditions.. <br /> Optical observations of sand particle movements provide important contributions to the understanding of the behaviour of sand particles and load transfer mechanism. Understanding of shear failure shallow foundation was done by plotting shear behaviour, dilation, and contraction zone. <br /> The experiment was perfomed using quartz 20 - 30 sand with dense and loose conditions. in order to omit pore water pressure and consolidation tests were perfomed in dry condition. By tracing sand particle movements, the shape of shear failure can be observed and plotted. <br /> Downward movement of the inclusion was followed by downward and lateral movement of the adjacent soil that represented a shear zone. Optical observations showed that zones of shear failure were passive triangle zone, radial shear zone, and linear shear zone, but the behaviour of sand particles still indicated a local shear failure mechanism. <br /> The shape of shear failure zone of optical observations can be approached by analitycal solution, for plane strain conditions based on Terzaghi's method and Sokolovskii's method and for axisymmetric conditions based on Cox's method. Conditions of dense and loose sand on linear shear zone, shear failure zone of optical observations were larger than shear failure zone based on numerical solutions, which its difference caused uncofined pressure for sand particles in the chamber (half cylindrical tube). <br /> Due to bearing capacity analysis of shear failure foundation, based on conventional calculation methods gave more satisfaction result than bearing capacity observed by laboratory test and hyperbolic model. During the testing in laboratory, also found unmeasured friction parameter between glass window and front plate of the chamber with inclusion of shallow foundation model. By those conditions result of laboratory test gave higher value than bearing capacity based on conventional methods.