Just enquiring to hear any thoughts on flooding/ponding as a compaction method? It was recently used on a job in Australia with silty sand as the backfill material. The end result was that the soil was extremely stiff. However a lot of underground utilities (ducting etc) have been deformed I am curious whether this may have contributed to this deformation by cause high pressures that do not usually occur or would it be another matter such as excess surface/surcharge loading causing the failures.
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