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Yayın Sustainable soil stabilization using colemanite: experimental and numerical analysis of sandy soils for improved geotechnical properties(Springer Nature, 2025-06-12) Koçak Dinç, Beste; Dehghanian, Kaveh; Etminan, EhsanThis paper discusses the use of colemanite, a boron compound, which is a natural additive to geotechnically improved sandy soils, thus providing an eco-friendly alternative to conventional soil stabilization. Clean angular sand was the base material with the addition of colemanite in amounts of 0%, 5%, 10%, and 15% by dry mass. Various laboratory tests, such as Atterberg limits, void ratio, specific gravity, compaction, permeability, and unconsolidated undrained triaxial tests, were carried out to determine the physical and mechanical characteristics of the produced mixtures. Numerical modeling, adopted by the PLAXIS finite element program, was used to carry out simulations under various conditions for soil profiles to determine and compare soil behavior. The findings revealed that the addition of colemanite significantly reduced permeability and void ratios while enhancing stiffness and strength, with 15% colemanite yielding the best performance. This study is one of those that focuses on the introduction of colemanite, which can also act as an effective stabilizer and is a much greener and more environmentally friendly option. Apart from this, it has other advantages both economically and ecologically by reducing the amount of cement, which is a high carbon source required for building based on this. The discoveries bring in the further development of green geotechnical engineering, which also includes the construction of sustainable infrastructures.Yayın 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 EngineeringThis 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.Yayın Improving the behaviour of sand with ceramic additives for sustainable ground engineering(Emerald Group Publishing, 2026-04-14) Koçak Dinç, Beste; Dehghanian, Kaveh; Etminan, EhsanThis study investigates the effectiveness of waste ceramic powder as a sustainable additive for improving the geotechnical behaviour of poorly graded sandy soils. Ceramic waste was mixed with sand at 5%, 10%, and 15% by dry weight, and its influence on density, permeability, and shear strength was evaluated through laboratory testing and numerical modelling. Results indicate a significant improvement in mechanical properties: the internal friction angle increased from 27 degrees for untreated sand to 40.6 degrees at 15% ceramic content, while apparent cohesion increased from 0 to 15.4 kPa. Permeability decreased markedly from 0.115 to 0.0356 m/s due to the micro-filler effect of fine ceramic particles. Maximum dry density increased from 1.553 to 1.904 g/cm & sup3;, indicating improved compaction behaviour. Finite element analyses using PLAXIS 8.6 confirmed the experimental findings, showing reduced static settlement (from 131 to 77 mm) and lower seismic-induced displacements under Kocaeli, Kobe, and Chi-Chi earthquake motions. The results demonstrate that waste ceramic powder is a low-carbon, cost-effective alternative for sandy soil stabilisation, contributing to sustainable ground engineering and circular material reuse.
