3D numerical simulation of consolidation induced in soft ground by EPB technology and lining defects.
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| Title: | 3D numerical simulation of consolidation induced in soft ground by EPB technology and lining defects. |
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| Authors: | Ochmański, Maciej1 (AUTHOR) maciej.ochmanski@polsl.pl, Spacagna, Rose Line2 (AUTHOR) rlspacagna@unicas.it, Modoni, Giuseppe2 (AUTHOR) modoni@unicas.it |
| Source: | Computers & Geotechnics. Dec2020, Vol. 128, pN.PAG-N.PAG. 1p. |
| Subjects: | Soil permeability, Soil-structure interaction, Earth pressure, Technology, Bending moment |
| Geographic Terms: | Bangkok (Thailand) |
| Abstract: | This paper analyses with a sophisticated numerical model the long-term phenomenology induced by Earth Pressure Balance tunnelling in compressible, low permeability soils. The complex soil-structure interaction determined by the EPB technology is analysed with a three-dimensional model that closely reproduces the sequence of face pressurisation, excavation, lining installation and tail grout injection and simulates the hydro-mechanical soil coupled response with a non-linear, irreversible, anisotropic hypoplastic model. After validation on a documented case study taken from literature, the model has been applied to a real example, MRTA Project in Bangkok. The study reveals that short and long-term settlements induced by tunnelling cannot be decoupled, being both governed by the fluid-soil-lining interaction and resulting from the time dependent stress transfer among the different elements. In this scenario over pressurising face and tail void reduces the immediate soil relaxation at the expenses of increasing the long-term settlements. Local or global defects have then been hypothesized on the lining waterproofness considering different initial groundwater conditions, soil permeability models and sets of EPB operative parameters. While concentrated lining defects play a negligible role, extensive imperfection noticeably increases settlements, volume loss and bending moments on the lining, with the same function of the relative soil-lining permeability. [ABSTRACT FROM AUTHOR] |
| Copyright of Computers & Geotechnics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 146613977 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: 3D numerical simulation of consolidation induced in soft ground by EPB technology and lining defects. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ochmański%2C+Maciej%22">Ochmański, Maciej</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> maciej.ochmanski@polsl.pl</i><br /><searchLink fieldCode="AR" term="%22Spacagna%2C+Rose+Line%22">Spacagna, Rose Line</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> rlspacagna@unicas.it</i><br /><searchLink fieldCode="AR" term="%22Modoni%2C+Giuseppe%22">Modoni, Giuseppe</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> modoni@unicas.it</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Computers+%26+Geotechnics%22">Computers & Geotechnics</searchLink>. Dec2020, Vol. 128, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Soil+permeability%22">Soil permeability</searchLink><br /><searchLink fieldCode="DE" term="%22Soil-structure+interaction%22">Soil-structure interaction</searchLink><br /><searchLink fieldCode="DE" term="%22Earth+pressure%22">Earth pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Technology%22">Technology</searchLink><br /><searchLink fieldCode="DE" term="%22Bending+moment%22">Bending moment</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Bangkok+%28Thailand%29%22">Bangkok (Thailand)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper analyses with a sophisticated numerical model the long-term phenomenology induced by Earth Pressure Balance tunnelling in compressible, low permeability soils. The complex soil-structure interaction determined by the EPB technology is analysed with a three-dimensional model that closely reproduces the sequence of face pressurisation, excavation, lining installation and tail grout injection and simulates the hydro-mechanical soil coupled response with a non-linear, irreversible, anisotropic hypoplastic model. After validation on a documented case study taken from literature, the model has been applied to a real example, MRTA Project in Bangkok. The study reveals that short and long-term settlements induced by tunnelling cannot be decoupled, being both governed by the fluid-soil-lining interaction and resulting from the time dependent stress transfer among the different elements. In this scenario over pressurising face and tail void reduces the immediate soil relaxation at the expenses of increasing the long-term settlements. Local or global defects have then been hypothesized on the lining waterproofness considering different initial groundwater conditions, soil permeability models and sets of EPB operative parameters. While concentrated lining defects play a negligible role, extensive imperfection noticeably increases settlements, volume loss and bending moments on the lining, with the same function of the relative soil-lining permeability. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Computers & Geotechnics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.compgeo.2020.103830 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Soil permeability Type: general – SubjectFull: Soil-structure interaction Type: general – SubjectFull: Earth pressure Type: general – SubjectFull: Technology Type: general – SubjectFull: Bending moment Type: general – SubjectFull: Bangkok (Thailand) Type: general Titles: – TitleFull: 3D numerical simulation of consolidation induced in soft ground by EPB technology and lining defects. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ochmański, Maciej – PersonEntity: Name: NameFull: Spacagna, Rose Line – PersonEntity: Name: NameFull: Modoni, Giuseppe IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 0266352X Numbering: – Type: volume Value: 128 Titles: – TitleFull: Computers & Geotechnics Type: main |
| ResultId | 1 |
