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. ttTI#Fr2
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coarse grained soils 300-400% 70d] d+M|
silty sands 100-400% VM=hQYe
building rubble 200%-400% BJ_+z gf`
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the upper bound test value (SPT) for landfill is 20-40 blow/300mm t*5z1T ?
different original relative density , overburden pressure, will cause different qc. =I
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another important point is the treatment depth related to the tamping energy. Cca~Cq[%*(
generally, 6m spacing is used for site tamping. t00\yb^vJ8
low-energy, high energy can be alternate for 4-5 passes and every pass is about 4-6 blows. M
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it is better of some experienced experts can provide some practical information.
