For heavy tamping, there is no accurate correlation between the tamping energy and shear strength, as I have known. there is some estimation of relative improvement. 7gf(5p5ZV
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coarse grained soils 300-400% k37?NoT
silty sands 100-400% HAK,z0/
building rubble 200%-400% ^t4^gcoZ4Z
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the upper bound test value (SPT) for landfill is 20-40 blow/300mm wz`% ( \
different original relative density , overburden pressure, will cause different qc. @`L ;_S+
another important point is the treatment depth related to the tamping energy. V*\hGNV
generally, 6m spacing is used for site tamping. q"2APvsvp
low-energy, high energy can be alternate for 4-5 passes and every pass is about 4-6 blows. -z`FKej
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it is better of some experienced experts can provide some practical information.
