Abstract:
Diaphragm walls are constructed with structural concrete, usually in deep excavations, either cast on location or using precast components. The construction of diaphragm walls is primarily concerned with supporting walls, heavy foundations, combined retaining walls and foundations, and deep basements. In the past, geotechnical engineers predicted excavation performance using conventional soil mechanics and empirical data. Deep excavations, however, were not easily predicted using these methods. The thickness of the diaphragm walls is considered 0.5m, 1m,
1.265m & 1.5m. Mohr Coulomb model and Hardening soil models are used to calculate the maximum wall displacement and ground settlement for each thickness. Also, the ground settlement and wall displacements are measured in both adjacent load and non-adjacent load conditions. The maximum allowable deflections are compared with other researches to validate the study.
In this study Diaphragm walls have shown fewer bulging effects. In general, hardening soil model shows less displacement and ground settlement compared to Mohr coulomb model. Ground settlement and wall displacements show harmony with the available literature. The maximum lateral deflection of Diaphragm wall towards the excavation measured is generally within 0.2% of excavation depth. And ground settlement should be 0.3% of excavation depth. From this study it is conclusive that Diaphragm wall with thicknessof0.5m of single basement is most cost efficient and satisfactory. Diaphragm wall is recommended as the retaining structure in Bangladesh for future projects.
Description:
Supervised by
Mr. Istiakur Rahman.
Assistant Professor
Department of Civil & Environmental Engineering
Islamic University of Technology (IUT)
Board Bazar, Gazipur-1704, Bangladesh.
This thesis is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Civil and Environmental Engineering, 2022.
