Abstract:The construction waste generated during urban renewal is often directly used for land backfilling, forming a large amount of mixed soil foundation with insufficient bearing capacity. Based on this, the article takes a high-rise residential project site as the research object, and through a systematic analysis of its geological conditions, ultimately selects the column hammer expanding lime soil compaction pile technology as the foundation reinforcement scheme for the site. The research results indicate that the column hammer expanding lime soil compaction pile technology is an effective reinforcement method for dealing with the mixed fill soil foundation formed by the backfilling of this type of construction waste.