Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling
The soil conditioning is a process of fundamental importance during the excavation of tunnels with Earth Pressure Balance full face machine. The soil conditioning is achieved through the addition of foam at the excavation face and in the bulk chamber that modifies the natural soil properties from so...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-11-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/10/11/438 |
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| author | Andrea Carigi Carmine Todaro Daniele Martinelli Cristina Amoroso Daniele Peila |
| author_facet | Andrea Carigi Carmine Todaro Daniele Martinelli Cristina Amoroso Daniele Peila |
| author_sort | Andrea Carigi |
| collection | DOAJ |
| description | The soil conditioning is a process of fundamental importance during the excavation of tunnels with Earth Pressure Balance full face machine. The soil conditioning is achieved through the addition of foam at the excavation face and in the bulk chamber that modifies the natural soil properties from solid-like to fluid-like with a pulpy behavior. Clearly, a material with a pulpy or fluid-like consistency is not suitable for the construction of embankments of landfill or for other civil purposes. It is therefore important to have a procedure able to identify how long it is necessary before the conditioned soil recovers its geo-mechanical properties, since this knowledge is needed at the design stages from a logistic point of view. The paper proposes and discusses a procedure to find out whether and when the conditioned soil gets back to its original properties. The procedure foresees direct shear tests, vane tests, Proctor tests, and rotational mixer tests at different time schedules from the production of the conditioned soil in the laboratory. The conditioned soil samples have been cured in a controlled environment up to 60 days from the conditioning. Thanks to these tests, it is possible to assess if and when the soil recovers its natural behavior or if a permanent alteration is induced. The proposed procedure has been applied to a standard alluvial soil showing that most of the original properties of the soil are recovered already after seven days from the conditioning. The carried-out tests have shown that the procedure is feasible and easy to apply. |
| first_indexed | 2024-03-10T15:02:58Z |
| format | Article |
| id | doaj.art-4e0e9b323749439e8b70375008e45d20 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T15:02:58Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-4e0e9b323749439e8b70375008e45d202023-11-20T19:58:12ZengMDPI AGGeosciences2076-32632020-11-01101143810.3390/geosciences10110438Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM TunnelingAndrea Carigi0Carmine Todaro1Daniele Martinelli2Cristina Amoroso3Daniele Peila4DIATI Tunneling and Underground Space Laboratory, Politecnico di Torino, 10128 Torino, ItalyDIATI Tunneling and Underground Space Laboratory, Politecnico di Torino, 10128 Torino, ItalyDIATI Tunneling and Underground Space Laboratory, Politecnico di Torino, 10128 Torino, ItalyDIATI Tunneling and Underground Space Laboratory, Politecnico di Torino, 10128 Torino, ItalyDIATI Tunneling and Underground Space Laboratory, Politecnico di Torino, 10128 Torino, ItalyThe soil conditioning is a process of fundamental importance during the excavation of tunnels with Earth Pressure Balance full face machine. The soil conditioning is achieved through the addition of foam at the excavation face and in the bulk chamber that modifies the natural soil properties from solid-like to fluid-like with a pulpy behavior. Clearly, a material with a pulpy or fluid-like consistency is not suitable for the construction of embankments of landfill or for other civil purposes. It is therefore important to have a procedure able to identify how long it is necessary before the conditioned soil recovers its geo-mechanical properties, since this knowledge is needed at the design stages from a logistic point of view. The paper proposes and discusses a procedure to find out whether and when the conditioned soil gets back to its original properties. The procedure foresees direct shear tests, vane tests, Proctor tests, and rotational mixer tests at different time schedules from the production of the conditioned soil in the laboratory. The conditioned soil samples have been cured in a controlled environment up to 60 days from the conditioning. Thanks to these tests, it is possible to assess if and when the soil recovers its natural behavior or if a permanent alteration is induced. The proposed procedure has been applied to a standard alluvial soil showing that most of the original properties of the soil are recovered already after seven days from the conditioning. The carried-out tests have shown that the procedure is feasible and easy to apply.https://www.mdpi.com/2076-3263/10/11/438EPB tunnelingsoil conditioningmuck disposalTBM machines |
| spellingShingle | Andrea Carigi Carmine Todaro Daniele Martinelli Cristina Amoroso Daniele Peila Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling Geosciences EPB tunneling soil conditioning muck disposal TBM machines |
| title | Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling |
| title_full | Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling |
| title_fullStr | Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling |
| title_full_unstemmed | Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling |
| title_short | Evaluation of the Geo-Mechanical Properties Property Recovery in Time of Conditioned Soil for EPB-TBM Tunneling |
| title_sort | evaluation of the geo mechanical properties property recovery in time of conditioned soil for epb tbm tunneling |
| topic | EPB tunneling soil conditioning muck disposal TBM machines |
| url | https://www.mdpi.com/2076-3263/10/11/438 |
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