Geoscience Reference
In-Depth Information
Weight
Drainage
Sand
Colloidal
silica
Fig. 15.28. Curing under sustained stressof sand treated by colloidal silicaliquid
Breakage of cementation during consolidation of clayey soil
Breakage.Cementation.fig. Data by Kuwabara, 1999
3500
3000
2500
2000
1500
1000
500
0
Cement-treated soil
Untreated soil
No increase in strength
0
2500
Effective mean principal stress, P
500
1000
1500
2000
3000
9
(kPa)
Fig. 15.29. Example ofbroken cementation in clay due toconsolidation volume change
investigated in Figure15.32 where sand improved by colloidal silica was subjected to
cyclic loading until a certain magnitude of strain occurred and then was sheared in a
monotonicundrainedmanner.Itisfoundinthisfigurethatstiffnessoftheimprovedsand
(tangent of stress-strain curve) after cyclic loading is still better than that of unimproved
sand. Thus, no fear is needed ofbreach of grouting effects.
