## 1 Introduction  
Clayey soils are frequently encountered problematic soils in geotechnical studies. In engineering work on such soils, many challenges arise due to their low strength, high compressibility, and settlement. Soil improvement and reinforcement are among the best alternatives in areas where such soils are present. One of the most effective methods used for many years is additive stabilization, which involves various additives such as fly ash, volcanic ash, volcanic tuff, silica fume, and lime. Due to the increasing costs and demand, and to prevent environmental pollution, researchers have sought materials with superior properties that are more environmentally friendly and easily accessible as raw materials, as technology has developed. Consequently, in recent years, various fibers such as carbon, polymer, basalt, and glass have been studied for this purpose, and research on the use of fibers in soil reinforcement applications has accelerated [1; 2; 3; 4; 5; 6; 7; 8; 9]. Among these fibers, basalt fiber is particularly noteworthy. This is because basalt fiber is derived from basalt rock, which forms as a result of the cooling of lava erupted from volcanic activity and is widely distributed in nature, available in large quantities, and naturally occurring. Additionally, its lack of harm to the environment, humans, and living beings, as well as its sustainability and high strength, are among its key features. However, due to their recent emergence, studies on the use of basalt fibers in soil reinforcement applications are still insufficient. In studies conducted on this subject, various geotechnical properties of soils have been examined by using basalt fibers in different proportions and lengths in different types of soils [10; 11; 12; 13]. The use of fiber materials in soil reinforcement processes is typically aimed at strengthening the physical properties of the soil matrix and improving soil behavior. In this context,the concept of \"cylinder confinement\" emerges as an innovative technique in geotechnical applications such as soil support systems, foundations, and slope stabilization, where cylindrical structures within the soil matrix are utilized to enhance strength and stability. Fiber-reinforced soil and cylinder confinement are complementary methods in civil engineering applications. While fiber reinforcements increase the resilience of the soil matrix, the use of cylindrical structures further amplifies the effects of these reinforcements. This combination improves soil behavior, enhancing the safety and durability of structures. Studies on this topic [14; 15; 16; 17; 18] indicate that cylinder confinement creates a structure around soil fibers, maintaining them in a specific arrangement. This structure facilitates the effective functioning of the fibers and their interaction with the soil, while the cylindrical form protects the soil fibers against external impacts and increases load-bearing capacity. Additionally, cylinder confinement enables the better distribution of soil fibers under external loads, thereby reducing the risk of cracking or deformation. The qu of soils can be determined in laboratories using the unconfined compressive test. However, these tests can often be time-consuming. In experimental studies, the fiber proportions, fiber lengths, and the amount of water used in preparing the mixtures are mostly selected randomly, and optimal values are obtained after performing numerous tests. Since these optimal values may vary in different types of soils, new experimental studies need to be conducted each time. This situation increases both the cost and labor, and, most importantly, it is very time-consuming. Furthermore, the test equipment may experience wear and tear due to repeated use in these experimental studies. To overcome these challenges, intelligent systems can be implemented to reduce time delays, minimize material waste, and lessen equipment wear, thereby enhancing both the efficiency and sustainability of the evaluation procedure.