Report No. : GEO Report No. 374

Report Title : Pilot Study on the Use of Self-compacting Backfill Material in Slope and Retaining Wall Works (2024), 63 p.

Author : C.C.W. Chan & R.L.Y. Ip

Abstract

In Hong Kong, the replacement of the top 3 m layer of loose fill is one of the options in upgrading loose fill slopes. However, it is usually difficult and time consuming to carry out compaction works and the necessary quality assurance tests with limited working space at steep terrain. With this background, a pilot study for the use of self-compacting backfill material in slope and retaining wall works was launched with a view to enhancing constructability and site safety of fill replacement operations in landslip prevention and mitigation works. This pilot study covers a review of the characteristics of self-compacting backfill materials, the quality control requirements for their use in slope and retaining wall works, together with a discussion on the benefits and limitations about their uses. The key design considerations for the use of self-compacting backfill material in slope and retaining wall works were also presented. The findings of this pilot study show that the self-compacting backfill material is a feasible alternative in the backfilling of pits, trenches and voids in slope and retaining wall works.

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