The undertaking of deep excavations in locations characterized by elevated groundwater levels, industrial zones, and huge projects involving sizable structures presents a significant amount of challenges. The techniques of secant piling are extremely effective remedies for circumstances like this. A combination of reinforced and plain concrete piles is used to construct the walls, stacked one on the other. The materials around these walls are retained or held back by these barriers. The dewatering process, which lowers the amount of groundwater, significantly influences the deformation and stability of secant pile walls.

 This study aims to investigate the behavior of a secant pile wall model when it supports sandy soil and is subjected to different water levels. The study looked into several different excavation depths on the passive side, including 0 meters, 0.2 meters, 0.4 meters, 0.6 meters, and 0.8 meters. Moreover, water levels at different excavation depths (0.0, 0.2, and 0.4 meters) were measured at a 0.2-meter excavation depth. Several parameters were evaluated, including the lateral total stress on both sides of the wall, horizontal and vertical displacement.

According to the tests' results, the water level significantly influences the values of the lateral total stress. A decrease in the water level leads to a decrease in the amount of active total stress, while an increase in the magnitude of passive total stress occurs. Furthermore, lowering the water level causes a more substantial vertical displacement than a horizontal displacement at the top of the wall. The findings demonstrate that lowering the water level improves secant pile wall safety and increases excavation work security. However, lowering the water level is seen to cause settling in the nearby foundation. This brings up an important point to keep in mind when there are nearby buildings.