High Energy Impact Rollers Compared with Single Drum Vibratory Rollers

Nowadays, impact rollers are gaining increasing favor among construction parties in subgrade compaction projects.

High-Energy Impact Compaction (HEIC) is a ground improvement and soil densification technique in geotechnical engineering. It achieves compaction of loose, weak or non-uniform soils over a large depth range by repeatedly applying high-energy dynamic impacts on the ground surface. Impact rollers are ideal equipment for deep subgrade compaction by adopting this technology.

Main Advantages of Impact Compactors over Single Drum Vibratory Rollers

1. Greater compaction depth and outstanding deep-layer reinforcement effect

The effective compaction depth of single-drum vibratory rollers is only 0.3-0.5m, focusing on surface densification. By contrast, impact compactors achieve deep-layer compaction of 1.0-1.5m, effectively eliminating deep voids in the subgrade and greatly reducing post-construction settlement. They are suitable for high-fill subgrades, rock-filled subgrades, and reinforcement of reconstructed and widened subgrades.

2. High compaction energy with remarkable improvement in overall bearing capacity

Through repeated low-frequency, high-energy compaction combining impact energy and gravitational force, impact compactors enhance the overall strength and stability of the subgrade. Single-drum vibratory rollers mainly apply high-frequency, low-amplitude vibration with shallow stress transmission, resulting in limited deep-layer reinforcement.

3. High construction efficiency and fast operation over large areas

Impact compactors travel at 12-20km/h with a wide compaction coverage and large single-pass treatment thickness. Single-drum vibratory rollers operate at 2-6km/h with thin lift thicknesses and multiple construction procedures, leading to lower efficiency for large-area subgrade works.


4. Wider range of applicable fill materials

They perform well on coarse-grained subgrades such as gravelly soil, rock fill, and soil-rock mixed fill, and can effectively crush large-particle-size materials. Single-drum vibratory rollers have poor compaction performance on thick rock-filled subgrades, often causing a dense surface layer with loose underlying soil.

5. Supplementary compaction for finished subgrades

Impact compactors can conduct impact reinforcement after conventional layered compaction to make up for deficiencies in layered rolling. Single-drum vibratory rollers are mostly used for layered construction and have minimal effect on later-stage deep-layer reinforcement.

6. Significant cost advantages

Compared in five dimensions including equipment purchase, fuel consumption & machine shift cost, construction efficiency, post-maintenance and overall construction cost, the long-term comprehensive cost of impact compactors is lower, offering extremely high cost-performance for large-area subgrade compaction.


Comparison Table for Compaction of 10,000m2 Subgrade

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