Study on characteristic of fluid soil in the chamber of EPB shield
The visualization system has been developed to control the fluidity of the excavated soil in the chamber of the EPB shield in real time during the shield advance. For further improvement of the visualization system, agitation tests of the fluid sand mixing with CMC aqueous solution as a thickening m...
| Main Authors: | , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2021-10-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/87/903/87_21-00185/_pdf/-char/en |
| _version_ | 1797989048536530944 |
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| author | Atsushi KAGAWA Yoshihide SUWA |
| author_facet | Atsushi KAGAWA Yoshihide SUWA |
| author_sort | Atsushi KAGAWA |
| collection | DOAJ |
| description | The visualization system has been developed to control the fluidity of the excavated soil in the chamber of the EPB shield in real time during the shield advance. For further improvement of the visualization system, agitation tests of the fluid sand mixing with CMC aqueous solution as a thickening material or rheological form to enhance fluidity have been carried out to clarify its flow property. It was confirmed by the tests that the agitating flapper torque of the fluid sand decreased with the increase of the number of flapper rotations. It is assumed that above-mentioned phenomenon was caused by the friction in-between the sand particles. Therefore, the fluidity property of the fluid sand is not exactly same as the general viscous fluid materials. It is, however, useful to evaluate this phenomenon in a numerical formula using the power-law model for the flow property in which shear stress decreases with the increase of the shearing deformation rate, and to apply the formula to numerical analysis, if the analysis is able to simulates the fluid sand behavior with high accuracy. As a result of the agitating tests, the formulas based on power-law model applied negative value to the power index was proposed to evaluate the flow property of the fluid sand. |
| first_indexed | 2024-04-11T08:14:03Z |
| format | Article |
| id | doaj.art-b94cca43bd3e45c18874e8aa379ebae7 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:14:03Z |
| publishDate | 2021-10-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-b94cca43bd3e45c18874e8aa379ebae72022-12-22T04:35:14ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612021-10-018790321-0018521-0018510.1299/transjsme.21-00185transjsmeStudy on characteristic of fluid soil in the chamber of EPB shieldAtsushi KAGAWA0Yoshihide SUWA1Obayashi Corporation, Civil Engineering Technology Division, Shield Tunnel Engineering DepartmentDepartment of Mechanical Engineering, Shibaura Institute of TechnologyThe visualization system has been developed to control the fluidity of the excavated soil in the chamber of the EPB shield in real time during the shield advance. For further improvement of the visualization system, agitation tests of the fluid sand mixing with CMC aqueous solution as a thickening material or rheological form to enhance fluidity have been carried out to clarify its flow property. It was confirmed by the tests that the agitating flapper torque of the fluid sand decreased with the increase of the number of flapper rotations. It is assumed that above-mentioned phenomenon was caused by the friction in-between the sand particles. Therefore, the fluidity property of the fluid sand is not exactly same as the general viscous fluid materials. It is, however, useful to evaluate this phenomenon in a numerical formula using the power-law model for the flow property in which shear stress decreases with the increase of the shearing deformation rate, and to apply the formula to numerical analysis, if the analysis is able to simulates the fluid sand behavior with high accuracy. As a result of the agitating tests, the formulas based on power-law model applied negative value to the power index was proposed to evaluate the flow property of the fluid sand.https://www.jstage.jst.go.jp/article/transjsme/87/903/87_21-00185/_pdf/-char/enearth pressure balanced shieldvisualization systemfluid sandflow propertiespower-law model |
| spellingShingle | Atsushi KAGAWA Yoshihide SUWA Study on characteristic of fluid soil in the chamber of EPB shield Nihon Kikai Gakkai ronbunshu earth pressure balanced shield visualization system fluid sand flow properties power-law model |
| title | Study on characteristic of fluid soil in the chamber of EPB shield |
| title_full | Study on characteristic of fluid soil in the chamber of EPB shield |
| title_fullStr | Study on characteristic of fluid soil in the chamber of EPB shield |
| title_full_unstemmed | Study on characteristic of fluid soil in the chamber of EPB shield |
| title_short | Study on characteristic of fluid soil in the chamber of EPB shield |
| title_sort | study on characteristic of fluid soil in the chamber of epb shield |
| topic | earth pressure balanced shield visualization system fluid sand flow properties power-law model |
| url | https://www.jstage.jst.go.jp/article/transjsme/87/903/87_21-00185/_pdf/-char/en |
| work_keys_str_mv | AT atsushikagawa studyoncharacteristicoffluidsoilinthechamberofepbshield AT yoshihidesuwa studyoncharacteristicoffluidsoilinthechamberofepbshield |