Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis
Increasing development of infrastructure in Indonesia has driven the need for effective ground improvement methods to accelerate the consolidation of soft soil, which is estimated to occupy around 10% of the country’s land area. A prefabricated vertical drain combined with vacuum preloading is among...
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| Format: | Article |
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MDPI AG
2023-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/11/6673 |
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| author | Meilani Adriyati Noriyuki Yasufuku Ryohei Ishikura Xueting Wu Ahmad Rifa’i |
| author_facet | Meilani Adriyati Noriyuki Yasufuku Ryohei Ishikura Xueting Wu Ahmad Rifa’i |
| author_sort | Meilani Adriyati |
| collection | DOAJ |
| description | Increasing development of infrastructure in Indonesia has driven the need for effective ground improvement methods to accelerate the consolidation of soft soil, which is estimated to occupy around 10% of the country’s land area. A prefabricated vertical drain combined with vacuum preloading is among the most effective methods for this purpose. However, the prefabricated vertical drain creates a smear zone in the surrounding soil area during installation. This study examines the effectiveness of a newly developed mandrel system in reducing the smear zone during prefabricated vertical drain installation. Large-scale consolidation tests at a macro level and microstructure analysis using scanning electron microscopy at a micro level were employed to investigate the effect of soil water content and shear strength. The results show that the water content and shear strength of the soft soil gradually increased in the inner smear zone and transition zone, while both decreased in the radial distance. Furthermore, the soil structure underwent a transformation in which the particle area and pore area became a closed flake structure, and apparent agglomeration occurred. The test results indicate that the newly developed mandrel system can effectively reduce the smear zone. The macro to micro test results demonstrated that the mandrel system is successful in reducing the smear zone effect. |
| first_indexed | 2024-03-11T03:12:02Z |
| format | Article |
| id | doaj.art-eebec4339e614626a98c1b87f7834496 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T03:12:02Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-eebec4339e614626a98c1b87f78344962023-11-18T07:35:17ZengMDPI AGApplied Sciences2076-34172023-05-011311667310.3390/app13116673Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro AnalysisMeilani Adriyati0Noriyuki Yasufuku1Ryohei Ishikura2Xueting Wu3Ahmad Rifa’i4Department of Civil and Structural Engineering, Kyushu University, Fukuoka 819-0395, JapanDepartment of Civil and Structural Engineering, Kyushu University, Fukuoka 819-0395, JapanDepartment of Civil and Structural Engineering, Kyushu University, Fukuoka 819-0395, JapanDepartment of Civil and Structural Engineering, Kyushu University, Fukuoka 819-0395, JapanDepartment of Civil and Environmental Engineering, Universitas Gadjah Mada, Yogyakarta 55281, IndonesiaIncreasing development of infrastructure in Indonesia has driven the need for effective ground improvement methods to accelerate the consolidation of soft soil, which is estimated to occupy around 10% of the country’s land area. A prefabricated vertical drain combined with vacuum preloading is among the most effective methods for this purpose. However, the prefabricated vertical drain creates a smear zone in the surrounding soil area during installation. This study examines the effectiveness of a newly developed mandrel system in reducing the smear zone during prefabricated vertical drain installation. Large-scale consolidation tests at a macro level and microstructure analysis using scanning electron microscopy at a micro level were employed to investigate the effect of soil water content and shear strength. The results show that the water content and shear strength of the soft soil gradually increased in the inner smear zone and transition zone, while both decreased in the radial distance. Furthermore, the soil structure underwent a transformation in which the particle area and pore area became a closed flake structure, and apparent agglomeration occurred. The test results indicate that the newly developed mandrel system can effectively reduce the smear zone. The macro to micro test results demonstrated that the mandrel system is successful in reducing the smear zone effect.https://www.mdpi.com/2076-3417/13/11/6673ground improvementvacuum preloadingPVDmicrostructure analysissmear zone |
| spellingShingle | Meilani Adriyati Noriyuki Yasufuku Ryohei Ishikura Xueting Wu Ahmad Rifa’i Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis Applied Sciences ground improvement vacuum preloading PVD microstructure analysis smear zone |
| title | Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis |
| title_full | Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis |
| title_fullStr | Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis |
| title_full_unstemmed | Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis |
| title_short | Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis |
| title_sort | improved mandrel system for prefabricated vertical drain installation a macro to micro analysis |
| topic | ground improvement vacuum preloading PVD microstructure analysis smear zone |
| url | https://www.mdpi.com/2076-3417/13/11/6673 |
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