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Field tests on partially geotextile encased stone column-supported embankment over silty clay
https://orcid.org/0000-0001-5518-6365
Abstract Various researchers have highlighted that geosynthetic-encased stone columns could be used in place of stone columns (SCs) in very soft soil. In this study, field load tests are performed on individual partially geotextile-encased stone columns (pESCs), individual stone columns (SCs), and a field embankment reinforced with pESCs and SCs in silty clay. Although the material cost of pESCs is designed to be comparable to that of SCs, the tests reveal that pESCs display a higher allowable bearing capacity and stress concentration ratio and less residual settlement than SCs. The embankment reinforced by pESCs is found to incur fewer lateral displacements, while there is no improvement in the drainage performance during the construction period compared to the SCs. For the pESCs, 51–66% of the pressure acting on the top of the column propagates to a depth of z = 1.2 m, wheras, for the SCs, it is only 21–55%. Furthermore, to estimate group behaviour, the ultimate bearing capacity of an individual pile composite ground can be extrapolated. However, individual pESCs achieve much higher stress concentration ratios than the pESC group.
Highlights The paper reports large scale field data of partially geotextile-encased stone columns (pESCs) and stone columns (SCs) supporting embankment. Although the material cost for pESCs was designed to be comparable to that of SCs in these tests, the pESCs had a higher allowable bearing capacity and less residual settlement. The ultimate bearing capacity of an individual pile composite ground could be extrapolated to estimate group behaviour. The individual pESCs achieved much higher stress concentration ratios than the pESC group.
Field tests on partially geotextile encased stone column-supported embankment over silty clay
https://orcid.org/0000-0001-5518-6365
Abstract Various researchers have highlighted that geosynthetic-encased stone columns could be used in place of stone columns (SCs) in very soft soil. In this study, field load tests are performed on individual partially geotextile-encased stone columns (pESCs), individual stone columns (SCs), and a field embankment reinforced with pESCs and SCs in silty clay. Although the material cost of pESCs is designed to be comparable to that of SCs, the tests reveal that pESCs display a higher allowable bearing capacity and stress concentration ratio and less residual settlement than SCs. The embankment reinforced by pESCs is found to incur fewer lateral displacements, while there is no improvement in the drainage performance during the construction period compared to the SCs. For the pESCs, 51–66% of the pressure acting on the top of the column propagates to a depth of z = 1.2 m, wheras, for the SCs, it is only 21–55%. Furthermore, to estimate group behaviour, the ultimate bearing capacity of an individual pile composite ground can be extrapolated. However, individual pESCs achieve much higher stress concentration ratios than the pESC group.
Highlights The paper reports large scale field data of partially geotextile-encased stone columns (pESCs) and stone columns (SCs) supporting embankment. Although the material cost for pESCs was designed to be comparable to that of SCs in these tests, the pESCs had a higher allowable bearing capacity and less residual settlement. The ultimate bearing capacity of an individual pile composite ground could be extrapolated to estimate group behaviour. The individual pESCs achieved much higher stress concentration ratios than the pESC group.
Field tests on partially geotextile encased stone column-supported embankment over silty clay
https://orcid.org/0000-0001-5518-6365
Abstract Various researchers have highlighted that geosynthetic-encased stone columns could be used in place of stone columns (SCs) in very soft soil. In this study, field load tests are performed on individual partially geotextile-encased stone columns (pESCs), individual stone columns (SCs), and a field embankment reinforced with pESCs and SCs in silty clay. Although the material cost of pESCs is designed to be comparable to that of SCs, the tests reveal that pESCs display a higher allowable bearing capacity and stress concentration ratio and less residual settlement than SCs. The embankment reinforced by pESCs is found to incur fewer lateral displacements, while there is no improvement in the drainage performance during the construction period compared to the SCs. For the pESCs, 51–66% of the pressure acting on the top of the column propagates to a depth of z = 1.2 m, wheras, for the SCs, it is only 21–55%. Furthermore, to estimate group behaviour, the ultimate bearing capacity of an individual pile composite ground can be extrapolated. However, individual pESCs achieve much higher stress concentration ratios than the pESC group.
Highlights The paper reports large scale field data of partially geotextile-encased stone columns (pESCs) and stone columns (SCs) supporting embankment. Although the material cost for pESCs was designed to be comparable to that of SCs in these tests, the pESCs had a higher allowable bearing capacity and less residual settlement. The ultimate bearing capacity of an individual pile composite ground could be extrapolated to estimate group behaviour. The individual pESCs achieved much higher stress concentration ratios than the pESC group.
Field tests on partially geotextile encased stone column-supported embankment over silty clay
Ouyang, Fang (author) / Wu, Zuoju (author) / Wang, Yingang (author) / Wang, Zhijia (author) / Cao, Jie (author) / Wang, Kaifeng (author) / Zhang, Jianjing (author)
Geotextiles and Geomembranes ; 52 ; 95-109
2023-09-11
15 pages
Article (Journal)
Electronic Resource
English
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