Ground subsidence due to the backfill pressure in tunnel boring machine
<p>In shield tunnel boring machine constructions, backfill pressure affects surface settlement and the stability of other underground structures nearby. Therefore, it is essential to pre-calculate backfill pressure in the design stage. This study examines and compares the seven internationally...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-04-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/382/19/2020/piahs-382-19-2020.pdf |
| Summary: | <p>In shield tunnel boring machine constructions, backfill
pressure affects surface settlement and the stability of other underground
structures nearby. Therefore, it is essential to pre-calculate backfill
pressure in the design stage. This study examines and compares the seven
internationally known backfill pressure calculation theories and calculates
and analyzes the backfill pressures in six virtual ground conditions. The
calculated backfill pressure increased as the ground cover increased, but
the increase rate decreased. Also, this study performs a numerical analysis
to identify the impact on ground settlement and tunnel crown settlement. In
the end, settlement was more impacted by face pressure than backfill
pressure in the unsaturated and saturated ground conditions. Also, as the
ground cover increased, the impact of backfill pressure decreased, and as
the applied face pressure decreased, the impact of backfill pressure
increased.</p> |
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| ISSN: | 2199-8981 2199-899X |