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    A case study of investigation of the lateral earth pressure under group effects of jet grout columns
    (Işık Üniversitesi, Lisansüstü Eğitim Enstitüsü, 2025-09-16) Durmaz, Eren; Etminan, Ehsan; Işık Üniversitesi, Lisansüstü Eğitim Enstitüsü, İnşaat Mühendisliği Yüksek Lisans Programı; Işık University, School of Graduate Studies, Master’s Program in Civil Engineering
    This thesis offers a detailed numerical case study on the impact of group effects from jet grout columns on lateral earth pressure behavior. Jet grouting, a sophisticated ground improvement technology, is extensively utilized to augment the strength and stability of poor soils. In seismically active nations like Türkiye, mitigating lateral earth stresses on retaining structures is essential for preserving structural integrity. A series of finite element calculations were performed in PLAXIS 2D to assess the lateral earth pressure distribution in a cohesive soil mass enhanced by clustered jet grout columns. To examine group effects, column spacing and layout were modified, while column length remained unchanged. The soil model was constructed using site-specific geotechnical data and simulated with suitable constitutive models to depict soft clay behavior. The results demonstrate that diminishing column spacing markedly reduces the lateral earth pressures exerted on the diaphragm wall and enhances positive group interactions among the jet grout columns. Furthermore, an optimal column arrangement improves slope stability and diminishes structural requirements on the diaphragm wall. The study highlights the necessity of considering group interactions in the design of jet grout column systems, especially in seismically active areas, and provides practical guidance for geotechnical engineers involved in urban excavations and retaining structures subjected to seismic conditions.