Abstract
As the self-weight of superstructures becomes increasingly large, higher requirements are set for the foundation. Therefore, foundation pits become increasingly deep and foundation trenches are narrower, which puts forward stricter requirements for the backfill quality of foundation trenches. Based on a transportation hub project in the south square of a railway station, this study analyzed difficulties in backfilling deep foundation pits and ultra-deep and ultra-narrow foundation trenches and proposed to use high-early-strength soil cement as backfill materials of the above foundation trenches. Moreover, the preparation process of high-early-strength soil cement and supporting equipment were studied and key technologies for backfill construction were elaborated in detail. This can provide engineering practices and technical reference for similar projects.
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