Abstract:
Uncontrolled fill sites pose significant geotechnical challenges for future development due to uncertain material quality, compaction, and load-bearing capacity. Converting these sites into reliable, controlled engineered fills is essential to ensure structural performance and reduce long-term settlement or failure risks. This paper presents the use of Impact Rolling as a fast, cost-effective, and quantifiable ground improvement technique for reworking and validating uncontrolled fills and significantly increasing the value of the development site.
Impact Rolling applies high-energy, non-circular dynamic loads to the ground, promoting deep compaction and densification well beyond the reach of conventional rollers. It is particularly suited for heterogeneous fill materials, where traditional compaction methods may be ineffective. By integrating real-time Intelligent Compaction Measurement and in-situ validation tools such as the GRIZZLY® Dynamic Probing and PANDA® Variable Energy Dynamic Cone Penetrometer strength profile and compaction control capability, site improvement is not only achieved but verified with quantifiable data.
Case studies are presented to illustrate the transformation of problematic fill sites into compliant platforms suitable for construction or infrastructure use. Results highlight the method’ s ability to improve ground stiffness, reduce voids, and demonstrate uniformity— reducing the need for costly excavation and replacement. This approach offers a practical, low-risk solution for developers and engineers dealing with legacy or undocumented fill conditions.
Keywords: Impact rolling, uncontrolled fill, controlled engineered fill, compaction control, land development site