STUDI EKSPERIMENTAL MODEL ELASTO-PLASTIK TANAH PASIR DAN INTERAKSI TANAH PONDASI AKIBAT BEBAN AKSIAL STATIK

• Main Author: MARIA HIDAYATI, ANISSA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/1265
• Institution: Institut Teknologi Bandung

Soil foundation interaction study due to axial static loading was performed. In this study, loading tests of small scale model in laboratory were conducted. The tests were conducted for model footing and model pile to obtain load-deformation relationship. Test results were compared to both conventional bearing capacity method and finite element method adopting constitutive soil model. The comparison was intended to evaluate performance of the soil model. HiSS constitutive model has been developed by Desai and Coworks (Desai, 1986) for soil modeling by considering non-associative behavior of the material, that is the plastic strain increment vector is not perpendicular to yield function. In this research, numerical and experimental verifications have been performed to obtain load deformation curve for sand. The Pascal BPHiSS computer program has been developed for back prediction of stress-strain relationship of the sand. The back prediction was performed to obtain the model performance with the behavior of soil represented by result of laboratory triaxial test. Cilacap sand is used in this research. Index properties and conventional triaxial compression-Consolidated Drained tests were performed to obtained soil parameters with relative density of 50 % and 70 %. Stress-strain and axial strain-volumetric strain relationship are obtained. The HiSS soil model parameters are then evaluated and calculated. Based on elasto-plastic constitutive matrix of HiSS soil model, what has been derived in this research. Computer program BPHiSS is developed for back prediction of laboratory test by using the obtained soil parameters. Verification of stress-strain relationship of HiSS soil model shows that the result is good and satisfactory. From the results of numerical and experimental verifications in this research, a numerical procedure for implementation of soil model into finite element method can be developed. The implementation of experiment in the laboratory is done by using static/cyclic triaxial test device at Inter University Center - ITB equipped with load cell and LVDT components which is electronically controlled by using data acquisition system.