Considerations for Judging the Suitability of Substitute Filling Materials for Compaction Pile Methods

摘要

To implement the sand compaction pile (SCP) method for soft ground improvement, so as to effectively use construction surplus soils and other recycled materials such as slag and coal ash, the authors have examined the suitability of such filling materials. Due to their high fines content, these materials are not easy to handle, and this may significantly affect their smooth implementation, or sometimes implementation impossible in the worst case. Thus, for the implementation of substitute filling materials to compaction pile, their evaluation needs to be made in advance by means of simple soil tests. Field site tests using such materials have been conducted so far by examining their suitability for easiness of implementation and improvement effect. These procedures, however, were time and cost consuming. This paper proposes a design flow to assess the applicability of filling materials for compaction pile methods, based on the findings from available laboratory and field site tests data. Furthermore, the suitability of the proposed design flow is confirmed from the results gained by applying it to test and actual implementations.