Parameters of dynamic compaction based on model test. Issue 168 (May 2023)

• Record Type: Journal Article
• Authors: Li, Peixuan; Sun, Jingyuan; Ge, Xinsheng; Zhang, Min; Wang, Jingyue
• Is Part Of: Soil dynamics and earthquake engineering. Issue 168(2023)
• Publication Date: 2023-05
• Subjects: Dynamic compaction -- Control standard -- Acceleration monitoring -- Damping ratio; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2023.107853
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: Several large–scale outdoor dynamic compaction model tests with energy levels, drop distances, masses and diameters of falling weight as variables, and different types of acceleration sensors are respectively designed in this paper to monitor inside soil mass, ground surface and falling weights dynamically. The following results are presented: the soil damping ratio changes with the increase of tamping times; at the same energy level, the horizontal reinforcement effect of a heavy falling weight on shallow and deep soil is better than a light falling weight and the ground surface vibration caused by heavy falling weight is small; the combination of tamping impulse and falling weight diameter is appropriate as the control standard of final cumulative settlement; the construction and detection of dynamic compaction can be assisted by the statistical relationship between the tamping impulse I, the impact time T and the single tamping settlement y. The results of this study are instructive for improving the construction quality of dynamic compaction. Highlights: The model test uses a soil pit instead of a test box to reduce the impact of stress wave reflection and refraction. The soil damping ratio is not a fixed value during dynamic compaction. The vibration attenuation waveforms of soil at different positions during dynamic compaction are obtained. In the same energy level, the horizontal reinforcement effect of the heavy falling weight is better. The statistical relationship between the tamping impulse, the impact time and the single tamping settlement was established.