Abstract:

Heavy tamping compaction is a traditional method in tamping construction of rubble bed. Some constraints in this method, such as small tamping energy and small dividing thickness, result in the low efficiency. A couple of improvements in the process of heavy tamping compaction are put forward. The proposed improvements are the increase in the tamping energy and the dividing thickness of rubble bed. Heavy hammer is first designed; then field contrast test of tamping stress and laboratory model test are carried out. The test results show that the new process is feasible. On this basis, the dividing thickness of rubble bed is increased to 4 m from 2 m. The construction results of the Songyu Harbour in Xiamen show that the improved process of heavy tamping compaction gets a good result; as the average compacting rate reaches as high as 14.85% and the efficiency increases significantly, so as to provide reference for similar engineering practice.

Key words: heavy tamping compaction, rubble bed, effective reinforced depth, field test, model test