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STUDY ON EARTH PRESSURE ACTING UPON SHIELD TUNNEL LINING IN CLAYEY AND SANDY GROUNDS BASED ON FIELD MONITORING (2009)
In this study, firstly, a series of field monitoring data on earth pressure in soft clay, hard clay and sand ground are analyzed respectively. In the soft clay ground, the earth pressure fluctuated with backfill grouting pressure at first, it settled down toward a steady value between (static vertical pressure Pv0±cohesion C) and distributed uniformly over the ring finally. In the hard clay ground, the earth pressure was more greatly influenced by the backfill grouting, especially for the lateral earth pressure in hard clay with 2C/pv0 ≈0.5. In the sand ground, although the earth pressure was also influenced by the backfill grouting, the distribution was relatively uniform than in hard clay ground since the hydraulic pressure accounts for a large portion in earth pressure. The insights obtained from this study can contribute to an improvement of load considerations in shield lining design.
Geotechnical Aspects of Underground Construction in Soft Ground – Ng, Huang & Liu (eds), © 2009 Taylor & Francis Group, London
Geo-Research Institute, Osaka, Japan