<p>Dynamic compaction is widely employed as a ground improvement technique; however, its influence on soil–structure interface behaviour is rarely incorporated into design practice. In particular, limited attention has been given to how dynamic compaction–induced densification may influence soil-concrete interface parameters in low-compressibility silts through indirect assessment methods. This study presents a CPT-based analytical framework to infer changes in soil-concrete interface friction parameters in an ML-type silt deposit subjected to dynamic compaction. Field investigations were conducted before and after dynamic compaction using a custom-fabricated conical tamper, and subsurface conditions were characterized through static cone penetration tests (CPT). Soil friction angles were derived from normalized CPT parameters using established correlations, and corresponding soil–concrete interface friction angles were estimated under an adopted interface reduction factor. Results indicate that dynamic compaction leads to a substantial increase in cone resistance and CPT-inferred soil friction angle within the improved zone. Under the stated reduction framework, these changes propagate analytically to an estimated enhancement in soil–concrete interface shear capacity. The study provides a structured CPT-based inference approach that enables estimation of ground improvement effects on interface parameters in the absence of direct interface shear testing.</p>