NUMERICAL STUDY OF EFFECT OF INTERMEDIATE PRINCIPAL STRESS AND APPLIED STRESS DIRECTION ON BANDUNG SOFT CLAY STRESS - DEFORMATION BEHAVIOUR

• Main Author: SYUHADA (NIM : 25015026), SYAHIDUS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31175
• Institution: Institut Teknologi Bandung

<p align="justify">The principal stress received by the soil consists of three, namely major principal stress, intermediate principal stress, and minor principal stress. In geotechnical problem, the influence of intermediate principal stress is being ignored or assuming the minor principal stress is equal to the intermediate principal stress. In actual condition, the soil receives the load in a three dimensional direction, so it is necessary to study the effect of intermediate principal stress. The variation of the effect of the intermediate principal stress is given in the form of a coefficient b which is the ratio of the increase in the intermediate principal stress of major major stress to the minor principal stress. <br /> <br /> Geotechnical cases can be simulated with finite element software to predict the stress response – strain and deformation of the soil against the working load. In finite element software provide a constitutive model to prediction of geotechnical cases. For clays, Sekiguchi – Ohta (Inviscid), Soft Soil, and Modified Cam Clay (MCC) models are often used. These three constitutive models will be used to predict stress – strain behavior (deformation), stress path, and excess pore water pressure in true triaxial test for Bandung soft clay and field prediction. <br /> <br /> These constitutive models give different responses to each other eith the same working load. The Sekiguchi – Ohta (Inviscid) and MCC models given smaller prediction than Laboratory test result for deviatoric stress at failure. The Soft Soil models gives qf value which is relatively close to true triaxial test result, but result in larger deviatoric when value of b > 0.25. <br /> <br /> Back prediction is doing to get a approached parameter with cases (Field and Laboratory). MCC and S-O (inviscid) is used to doing back prediction in laboratory testing cases. For back prediction of true triaxial, the soil parameter are ... (parameter of true triaxial test result) Value of b = 0.7 – 0.8 is given to b value in the filed with MCC and S-O (Inviscid) constitutive models . The Soft Soil model give greater result of deformation by increasing the value of b. <p align="justify">