In the world of deep foundation and earth-retention systems, two widely recognized and essential techniques are contiguous piling and Bohrpfähle. These methods are often utilized in urban developments, infrastructure projects, and large-scale excavations, offering effective solutions for ground support, stability, and load transfer in challenging geotechnical environments. Their application is particularly prominent in areas where space constraints, soil conditions, or structural load requirements demand precision-engineered solutions. Contiguous piling is a retaining wall system created by placing concrete piles adjacent to each other with small gaps left between them. These piles are constructed using bored or driven methods and are designed to provide lateral support to excavations or slopes. The small spacing between the piles allows some groundwater flow, which can be beneficial in certain soil types where managing hydrostatic pressure is essential. However, the wall can ...