Settlement of a railway embankment on PVD-improved Karakore soft alluvial soil

被引:15
作者
Muhammed, Jemal Jibril [1 ]
Jayawickrama, Priyantha W. [2 ]
Teferra, Alemayehu [3 ]
Ozer, M. Aydin [4 ]
机构
[1] Jimma Univ, Jimma Inst Technol, Fac Civil & Environm Engn, Transportat Engn Program, Jimma, Ethiopia
[2] Texas Tech Univ, Dept Civil Environm & Construct Engn, Box 41023, Lubbock, TX 79409 USA
[3] Addis Ababa Univ, Addis Ababa Inst Technol, Fac Civil & Environm Engn, Addis Ababa, Ethiopia
[4] Awash Kombolcha Hara Gebaya Railway Project, Kombolcha, Ethiopia
来源
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH | 2020年 / 23卷 / 05期
关键词
Karakore soft alluvial soil; PVD-improved; Embankment; Settlement; Numerical modelling; Class A prediction; Class C prediction; Consolidation parameters; VERTICAL DRAINS; BANGKOK CLAY; PREDICTION; BEHAVIOR; PERFORMANCE; DESIGN; SMEAR;
D O I
10.1016/j.jestch.2020.03.004
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper presents a case history of the settlement performance of a railway embankment built on a Prefabricated Vertical Drain (PVD) improved soft alluvial soil of Karakore area, Wollo province, northeast of Ethiopia. The embankment was constructed on Awash - Kombolcha - Haragebaya (AKH) railway project for the purpose of preloading so as to facilitate the consolidation settlement in a short period of time; and it was monitored for more than 750 days. Numerical predictions of Class A and Class C (based on back-calculation procedure) were performed using Plaxis 2D. The soft soil creep (SSC) model was employed for the soft soil layers, while the Mohr-Coulomb (MC) model was used for the drainage and fill layers. The predictions were compared with the field monitoring settlement data. Quite a reasonable agreement was achieved from the finite element modelling of Class C prediction when the prediction was compared with the actual field settlement values. Parametric sensitivity studies were carried out to examine the influence of parameters on the rate and magnitude of settlements. The results of the numerical predictions and parametric studies have been discussed in detail. The soil on the flood plain area of Karakore is found to be very soft to soft alluvial deposit and formed over Tertiary Eocene stiff clay. The variable conditions of the soil formation and deposition highly dictated the deformation and excess pore water pressure behaviour of the soft subsoil sediment. The parametric sensitivity study showed that, following the compression index, the initial void ratio, the hydraulic conductivity, and the OCR highly influenced the settlement responses of PVD-improved soft alluvium soil respectively. (C) 2020 Karabuk University. Publishing services by Elsevier B.V.
引用
收藏
页码:1015 / 1027
页数:13
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