An assessment of the geological and geotechnical properties of Mekong Delta Clay in engineering works in The Mekong Delta, Vietnam

Name: Mi, Nguyen Vo Ai

LCSH: Kasetsart University -- Theses. M.Eng. (Civil Engineering) 2022.

Classification :.LCCS: TA775

LCSH: Kasetsart University. -- Department of Civil Engineering -- Theses.

LCSH: Geotechnical engineering -- Vietnam -- Mekong River Delta.

LCSH: Clay soils -- Vietnam -- Mekong River Delta.

LCSH: Soil consolidation -- Vietnam -- Mekong River Delta.

Abstract: This study investigates the geological and geotechnical properties of Mekong Delta Clay in southern Vietnam, specifically within backswamp/swamp, sand dune, and mangrove marsh landforms. The research utilizes data from 53 boreholes to assess consolidation characteristics and over 4,000 boreholes in Bangkok Clay for comparative analysis. Results show that Mekong Delta Clay ranges in thickness from 2.5 to 25 meters, while Bangkok Clay ranges from 3 to 30 meters. Mekong Delta Clay consists mainly of low to high-plasticity soil (CL–CH), with liquid limits (LL) ranging from 32.60% to 82.54%, while Bangkok Clay is predominantly high-plasticity soil (CH) with LL values between 50.27% and 96.77%. The compression index (Cc) indicates that Mekong Delta Clay has lower compressibility (Cc = 0.12–0.65) compared to Bangkok Clay (Cc = 0.51–1.54). The primary consolidation settlements for backswamp/swamp, sand dune, and mangrove marsh landforms exceed the allowable limit of 250 mm at five years post-construction. To address this, the study proposes using prefabricated vertical drains (PVDs) to expedite settlement. PVDs designed with specific depths (12–14 m, 10–12 m, and 14–16 m) and a spacing of 1 m accelerate the consolidation process, achieving consolidation percentages of 87–92% within a shortened timeframe of 3 months. After preloading, the remaining settlements range from 54 to 130 mm, 27 to 83 mm, and 67 to 170 mm for the backswamp/swamp, sand dune, and mangrove marsh landforms, respectively, all within the permissible limit of 250 mm. These findings have practical implications for the planning, design, and construction of highway embankments, highlighting the effectiveness of PVDs in mitigating settlement issues.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Siranya Thongchart

Role: Thesis Advisor

Name: Warakorn Mairaing

Role: Thesis Co-Adviso

Created: 2022

Modified: 2025-06-24

Issued: 2025-06-24

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2565/nguyen-voai-all.pdf

CallNumber: TA775.M56

eng

Spatial: Vietnam Mekong River Delta.

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Civil Engineering

Grantor: Kasetsart University

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