Abstract: In recent years, excavation engineering in China has expanded at an unprecedented rate, posing significant challenges concerning excessive material consumption and muck disposal. Mitigating construction costs and minimizing resource wastage have emerged as critical concerns in this field. As an efficient foundation pit support technique, construction piles have experienced significant advancements and are increasingly utilized in engineering practice. This study introduces the Prestressed Mixing Wall (PMW) technology, which utilizes muck to form piles, followed by the insertion of externally prestressed H-shaped steel to enhance resistance to deformation. Laboratory loading tests are conducted on H-shaped steel sections to investigate the deformation behavior of PMW. Theoretical formulas are derived to quantify internal forces and deformations, and field applications are carried out to validate the technology's effectiveness. The results indicate that as prestress increases, the deformation of the H-shaped steel in the direction of the applied force is significantly reduced, even reaching a state of "zero" deformation, while the axial force increment in prestressed steel strands remains independent of the applied prestress. Field applications further validate the strong deformation control capability of PMW, allowing for the reduction or even elimination of additional support structures, which substantially reduces engineering costs and construction duration while facilitating the efficient utilization of muck. These advantages highlight its notable low-carbon, economic, and environmental benefits, underscoring its broad potential for widespread application.