Abstract:

 A large field test was conducted in the project of the Qing-Lin Expressway. Forty-eight soil pressure cells were embedded in the test section of the road. Different classes of tamping energy(2000, 2250, 2500, 2800kN·m) were used in this test. A dynamic strain gauge was used to record the dispersion and decay of the stress caused by dynamic compaction. The results showed that the reinforce effect on the waste iron slag embankment and the dynamic stress were both obvious. The dynamic stress decayed very fast and increased with the tamping energy. The vertical influence distance of dynamic stress was larger than that of the horizontal, and the dynamic stress was more than 10kPa at 8m under the rammer. The critical dynamic stress of the effective impacting depth was about 20kPa. The decay speed of the horizontal dynamic stress was faster than that in the vertical. The effective horizontal impacting distance was about 3m. With the compaction numbers increased, the dynamic stress in the reinforced range obviously increased and tended to be stable after about the third hit.

Key words: dynamic consolidation, waste iron slag, soil dynamic stress, test study