A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs
Full-face water-rich gravel stratum is a large challenge during tunnel excavation with earth pressure balance shields (EPBs) because of accidents such as water spewing from the screw conveyor and ground collapse. Slurry and polymer have been used as conditioning agents to avoid such problems and thu...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/5/2109 |
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| author | Xin Lin Xiong Zhou Yuyou Yang |
| author_facet | Xin Lin Xiong Zhou Yuyou Yang |
| author_sort | Xin Lin |
| collection | DOAJ |
| description | Full-face water-rich gravel stratum is a large challenge during tunnel excavation with earth pressure balance shields (EPBs) because of accidents such as water spewing from the screw conveyor and ground collapse. Slurry and polymer have been used as conditioning agents to avoid such problems and thus ensure a successful tunneling. However, limited improvement of sandy gravel was achieved when traditional soil conditioner were applied. This study proposes a new conditioner (modified slurry) consisting of bentonite slurry, viscosity modifier, sodium silicate and polymer, which will enhance the properties of sand gravel stratum. Low reaction time, high apparent viscosity, good plastic behavior and low permeability were employed for investigating the optimum ratio of the ingredients. The proposed modified slurry has a good performance in conditioning sandy gravel soils and can be the reference for EPBs’ excavation in highly permeable, non-adhesive coarse-grained soil stratum. |
| first_indexed | 2024-03-09T06:20:11Z |
| format | Article |
| id | doaj.art-d58a611222d745a4a7e3e264e7abf416 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T06:20:11Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-d58a611222d745a4a7e3e264e7abf4162023-12-03T11:49:21ZengMDPI AGApplied Sciences2076-34172021-02-01115210910.3390/app11052109A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBsXin Lin0Xiong Zhou1Yuyou Yang2School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, ChinaFull-face water-rich gravel stratum is a large challenge during tunnel excavation with earth pressure balance shields (EPBs) because of accidents such as water spewing from the screw conveyor and ground collapse. Slurry and polymer have been used as conditioning agents to avoid such problems and thus ensure a successful tunneling. However, limited improvement of sandy gravel was achieved when traditional soil conditioner were applied. This study proposes a new conditioner (modified slurry) consisting of bentonite slurry, viscosity modifier, sodium silicate and polymer, which will enhance the properties of sand gravel stratum. Low reaction time, high apparent viscosity, good plastic behavior and low permeability were employed for investigating the optimum ratio of the ingredients. The proposed modified slurry has a good performance in conditioning sandy gravel soils and can be the reference for EPBs’ excavation in highly permeable, non-adhesive coarse-grained soil stratum.https://www.mdpi.com/2076-3417/11/5/2109modified slurryEPBssandy gravelplasticitypermeability |
| spellingShingle | Xin Lin Xiong Zhou Yuyou Yang A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs Applied Sciences modified slurry EPBs sandy gravel plasticity permeability |
| title | A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs |
| title_full | A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs |
| title_fullStr | A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs |
| title_full_unstemmed | A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs |
| title_short | A New Soil Conditioner for Highly Permeable Sandy Gravel Stratum in EPBs |
| title_sort | new soil conditioner for highly permeable sandy gravel stratum in epbs |
| topic | modified slurry EPBs sandy gravel plasticity permeability |
| url | https://www.mdpi.com/2076-3417/11/5/2109 |
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