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Contribution by C. Raison Pugh (2017) has written a very interesting and informative paper that serves as a timely reminder of the risks to floor slabs carried on stone columns in very soft clays. The paper provides two extremely important conclusions: (a) that there is an upper limit to the degree of improvement feasible using vibro stone columns in very soft clays and (b) that it is essential to consider not only primary consolidation of soft clays, but also the potential for large secondary consolidation (creep) settlement. The discusser believes that some specialist ground improvement contractors fail to understand or properly consider primary consolidation, let alone the potential for large secondary creep settlements. There is also a risk in applying design methodologies based on an extreme simplification of the ground improvement system and soil properties without fully understanding the influence of the treatment process on the final performance.

Discussion: Settlement of floor slabs on stone columns in very soft clays