An observational method for consolidation analysis of the PVD-improved subsoil
Surcharge preloading together with prefabricated vertical drains (PVDs) have been widely used to improve properties of thick clay deposits. To assess the performance of soil improvement works, the average degree of consolidation needs to be estimated. A curve fitting formula is proposed in this pape...
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sg-ntu-dr.10356-1424312020-06-22T04:17:38Z An observational method for consolidation analysis of the PVD-improved subsoil Guo, Wei Chu, Jian Nie, Wen School of Civil and Environmental Engineering Engineering::Civil engineering Geosynthetics PVD Surcharge preloading together with prefabricated vertical drains (PVDs) have been widely used to improve properties of thick clay deposits. To assess the performance of soil improvement works, the average degree of consolidation needs to be estimated. A curve fitting formula is proposed in this paper to simulate the degree of consolidation versus a non-dimensional time factor relationship. The proposed formula fits the theoretical consolidation solutions well with a regression coefficient R2 larger than 0.9996 and an error of less than 1.2%. Based on the formula, a modified Asaoka's observational method is proposed to predict the ultimate settlement and calculate the coefficient of consolidation using field settlement monitoring data. The effectiveness of the proposed observational method has been verified using some well-documented case histories. Comparisons between the proposed method and the Asaoka's method indicate that the proposed method will give a less than 1.0% higher ultimate settlement than that by the Asaoka's method and the proposed method is able to predict the ch value with the consideration of both vertical and horizontal flow through the ratio of time factor in horizontal and vertical direction νhv. 2020-06-22T04:17:37Z 2020-06-22T04:17:37Z 2018 Journal Article Guo, W., Chu, J., & Nie, W. (2018). An observational method for consolidation analysis of the PVD-improved subsoil. Geotextiles and Geomembranes, 46(5), 625-633. doi:10.1016/j.geotexmem.2018.04.014 0266-1144 https://hdl.handle.net/10356/142431 10.1016/j.geotexmem.2018.04.014 2-s2.0-85047270906 5 46 625 633 en Geotextiles and Geomembranes © 2018 Elsevier Ltd. All rights reserved. |
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Engineering::Civil engineering Geosynthetics PVD Guo, Wei Chu, Jian Nie, Wen An observational method for consolidation analysis of the PVD-improved subsoil |
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Surcharge preloading together with prefabricated vertical drains (PVDs) have been widely used to improve properties of thick clay deposits. To assess the performance of soil improvement works, the average degree of consolidation needs to be estimated. A curve fitting formula is proposed in this paper to simulate the degree of consolidation versus a non-dimensional time factor relationship. The proposed formula fits the theoretical consolidation solutions well with a regression coefficient R2 larger than 0.9996 and an error of less than 1.2%. Based on the formula, a modified Asaoka's observational method is proposed to predict the ultimate settlement and calculate the coefficient of consolidation using field settlement monitoring data. The effectiveness of the proposed observational method has been verified using some well-documented case histories. Comparisons between the proposed method and the Asaoka's method indicate that the proposed method will give a less than 1.0% higher ultimate settlement than that by the Asaoka's method and the proposed method is able to predict the ch value with the consideration of both vertical and horizontal flow through the ratio of time factor in horizontal and vertical direction νhv. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Guo, Wei Chu, Jian Nie, Wen |
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Article |
author |
Guo, Wei Chu, Jian Nie, Wen |
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Guo, Wei |
title |
An observational method for consolidation analysis of the PVD-improved subsoil |
title_short |
An observational method for consolidation analysis of the PVD-improved subsoil |
title_full |
An observational method for consolidation analysis of the PVD-improved subsoil |
title_fullStr |
An observational method for consolidation analysis of the PVD-improved subsoil |
title_full_unstemmed |
An observational method for consolidation analysis of the PVD-improved subsoil |
title_sort |
observational method for consolidation analysis of the pvd-improved subsoil |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/142431 |
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1681057487425372160 |