Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track
High-speed railways are built in deep soft-soil foundations interlayered with hard materials. However, the hard layers cannot be penetrated by conventional foundation treatment. Moreover, the project cost is sometimes prohibitive, which is an issue for post-construction subsidence control. The bag g...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/9/4662 |
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| author | Shen Zuo Qingyu Zhang Jin Li Peng Liu Fengkun Cui Ying Chen |
| author_facet | Shen Zuo Qingyu Zhang Jin Li Peng Liu Fengkun Cui Ying Chen |
| author_sort | Shen Zuo |
| collection | DOAJ |
| description | High-speed railways are built in deep soft-soil foundations interlayered with hard materials. However, the hard layers cannot be penetrated by conventional foundation treatment. Moreover, the project cost is sometimes prohibitive, which is an issue for post-construction subsidence control. The bag grouting pile is a special grouting-pile-reinforcement technique for treating soft-soil foundations interlayered with hard materials. This paper conducted tests on the Ningbo-Taizhou-Wenzhou ballast track passenger railway, combining a conventional mixing-pile-foundation (not through hard layer) processing station and the bag-grouting-pile-processing subgrade line. Using field tests combined with numerical calculation, the lateral displacement, settlement and pile–soil stress were tested to obtain the working properties of the grouting-pile-composite foundation. The variation in the law of lateral displacement, settlement, and pile–soil stress of the foundation was studied. The results showed that the post-construction subsidence of bag-grouting-pile- and conventional mixing-pile-foundation control was less than 15 cm and 30 cm, respectively, which met the design requirements. The results also showed that the design scheme was reasonable (load-sharing ratio of bag-pile-foundation pile soil-based test was reasonable). The numerical calculation showed a change in pile diameter. It also showed that pile spacing could not improve subsidence-control properties, bag grouting pile can promote pore-pressure dissipation and accelerate consolidation, and pile spacing can be increased to cut project costs incurred by the pile-bearing capacity. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T04:20:12Z |
| publishDate | 2022-05-01 |
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| series | Applied Sciences |
| spelling | doaj.art-a89e5c10813a4c52b8b2351787413ff02023-11-23T07:52:10ZengMDPI AGApplied Sciences2076-34172022-05-01129466210.3390/app12094662Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast TrackShen Zuo0Qingyu Zhang1Jin Li2Peng Liu3Fengkun Cui4Ying Chen5School of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaSchool of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaSchool of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaSchool of Civil Engineering, Central South University, Changsha 410004, ChinaSchool of Transportation Civil Engineering, Shandong Jiaotong University, Jinan 250357, ChinaSchool of Civil Engineering, Central South University of Forestry and Technology, 498 Shaoshan Road, Changsha 410004, ChinaHigh-speed railways are built in deep soft-soil foundations interlayered with hard materials. However, the hard layers cannot be penetrated by conventional foundation treatment. Moreover, the project cost is sometimes prohibitive, which is an issue for post-construction subsidence control. The bag grouting pile is a special grouting-pile-reinforcement technique for treating soft-soil foundations interlayered with hard materials. This paper conducted tests on the Ningbo-Taizhou-Wenzhou ballast track passenger railway, combining a conventional mixing-pile-foundation (not through hard layer) processing station and the bag-grouting-pile-processing subgrade line. Using field tests combined with numerical calculation, the lateral displacement, settlement and pile–soil stress were tested to obtain the working properties of the grouting-pile-composite foundation. The variation in the law of lateral displacement, settlement, and pile–soil stress of the foundation was studied. The results showed that the post-construction subsidence of bag-grouting-pile- and conventional mixing-pile-foundation control was less than 15 cm and 30 cm, respectively, which met the design requirements. The results also showed that the design scheme was reasonable (load-sharing ratio of bag-pile-foundation pile soil-based test was reasonable). The numerical calculation showed a change in pile diameter. It also showed that pile spacing could not improve subsidence-control properties, bag grouting pile can promote pore-pressure dissipation and accelerate consolidation, and pile spacing can be increased to cut project costs incurred by the pile-bearing capacity.https://www.mdpi.com/2076-3417/12/9/4662bag grouting piledeep soft soilinterlayerhard materialsfield testfinite-element calculation |
| spellingShingle | Shen Zuo Qingyu Zhang Jin Li Peng Liu Fengkun Cui Ying Chen Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track Applied Sciences bag grouting pile deep soft soil interlayer hard materials field test finite-element calculation |
| title | Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track |
| title_full | Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track |
| title_fullStr | Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track |
| title_full_unstemmed | Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track |
| title_short | Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track |
| title_sort | study of bag grouting pile reinforcing deep soft soil foundation with an interlayer of hard materials on high speed railway ballast track |
| topic | bag grouting pile deep soft soil interlayer hard materials field test finite-element calculation |
| url | https://www.mdpi.com/2076-3417/12/9/4662 |
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