## 5 Conclusions  
This study investigated the bearing capacity and settlement behaviour of gravel soils and focused on determining their relationships with various soil parameters through correlation analysis. The results revealed a significant relationship between the bearing capacity of gravel soil (ranging from 2.22 to 5.98 g/cm\({}^{2}\)) and No. 200 value, while other soil parameters showed weaker correlations. The predictive modelling of bearing capacity using multiple regression techniques provided different levels of accuracy. The linear regression model reflected moderate predictive accuracy, explaining 46% of the variance(R\({}^{2}\) = 0.46). The quadratic model provided improved predictions by explaining 69% of the variance (R\({}^{2}\) = 0.688), while the cubic model showed the highest accuracy, explaining 79% of the variance (R\({}^{2}\) = 0.79), capturing complex relationships more effectively. The settlement analysis did not reveal any significant correlation between the settlement values (between 0.0 and 3.55 cm) and individual soil parameters. However, predictive modelling using regression techniques showed strong predictive capabilities. The linear regression model explained 85% of the variance in settlement (R\({}^{2}\) = 0.846), while both the second-order and third-order models achieved very high accuracy (R\({}^{2}\) = 0.904). These findings indicate that the settlement behaviour is more directly affected by soil properties such as excavation level, unit weight, and grain size distribution than the bearing capacity. This study highlights the effectiveness of nonlinear regression models, especially the second-order and third-order models, in predicting the geotechnical properties of gravel soils. These models provide valuable information for foundation design by providing accurate predictions of bearing capacity and settlement behaviour. The findings also highlight the need for further research on other soil types such as sandy, clayey, and silty soils and their mixed compositions. Examining these relationships across different soil types can improve predictive modelling and contribute to the development of generalized prediction techniques for geotechnical engineering applications. The settlements that occur in soils consist of two components: elastic settlement and consolidation settlement. Elastic settlement is also defined as sudden settlement and occurs during the construction period when the structure load is transferred to the soil. Consolidation settlement is a process that takes a long time to complete. The settlements that cause damage to structures consist of the sum of these two elements. Especially in soils subjected to preloading, elastic collapse covers a significant part of the total collapse. Since the soil is heterogeneous, it is not expected to show the same behaviour on every side of the structure. In this case, there may be settlements exceeding the limit values in the structure in the soil section that is weaker in terms of settlement. Due to these settlements, additional stresses, cracks, and settlements may occur in the load-bearing elements of rigid structures. Therefore, it is important to determine the magnitude of both settlement components as well as the rigidity of the structure. The settlements in the ground and the bearing capacity of the ground generally depend on important parameters such as the load acting on the ground, the unit weight of the ground, the cohesion coefficient of the ground, the internal friction angle, the Poisson ratio, the modulus of elasticity, the void ratio, the degree of saturation, the groundwater level, the rigidity coefficient of the ground, and the narrow side width of the foundation resting on the ground. However, which of these affect the bearing capacity and consolidation properties of the soil and whether the levels of effect are the same for all or different from each other are important issues.