Abstract
Dynamic compaction is a cost-effective foundation treatment method which can improve the bearing capacity of foundation, reduce compressibility, eliminate collapsibility and ameliorate seismicity. With the development of foundation treatment along depth and breadth, the energy level of dynamic compaction also improves constantly. From 8000kN.m in 1991 to 18000kN.m in 2008, energy level has increased 10000kN.m in 18 years. This project is the first experimental research using 20000 kN.m high energy level dynamic compaction process in China. The shallow plate loading test, dynamic penetration test, laboratory soil test method have been used to detect the effect of dynamic compaction. The results show that the characteristic value of bearing capacity of foundation after dynamic compaction fak=345kPa, effective depth of dynamic compaction is 18m. The soil dry density after compaction is 1.77~1.82 g/cm3. This article is based on the high embankment engineering in northwestern China, carrying out the relevant test work of 20000 kN.m high level construction, proposing the high filling compaction ground simultaneously, the idea of recompression ground treatment, and providing reference value for the foundation treatment concept, design, construction and providing the basis for preparation of specification.
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