Dynamic Compaction of Ultra-High Energy in Combination with Ground Replacement in Coastal Reclamation Areas |
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| Authors: | Shi-Jin Feng Ke Tan Wei-Hou Shui |
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| Affiliation: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering , Tongji University , Shanghai , China fsjgly@tongji.edu.cn;3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering , Tongji University , Shanghai , China;4. Shanghai Shenyuan Geotechnical Engineering Co., Ltd. , Shanghai , China |
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| Abstract: | This paper presents a case study of dynamic compaction (DC) on backfill ground for planned oil tanks located at Nanjing Bay. The ultra-high energy DC level of 18,000 kN · m was applied in the area tamping phase of the dynamic compaction. In combination with ground replacement technique by forcing crushed stones into the underlain cohesive layer, the high-compressibility of this layer was properly tackled. The construction techniques and ground improvement mechanisms are introduced and discussed. Field evaluations before and after the dynamic compaction, including surface wave test, plate load test, and soil sampling, showed that the ultra-high energy dynamic compaction in combination with ground replacement achieved much greater improvement depth and ground bearing capacity than conventional DC. Results show that dynamic compaction of 18,000 kN · m combined with ground replacement is of great merit in dealing with backfill ground with weak cohesive content in harbor development. |
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| Keywords: | Dynamic compaction ground replacement improvement depth surface wave test |
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