Bearing behaviour of piled raft foundation with ground subsidence in Ho Chi Minh City, Vietnam

Name: Quang, Ha Tran.

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

Classification :.LCCS: TA780

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

LCSH: Piling (Civil engineering)

LCSH: Tall buildings -- Foundations.

LCSH: Tall buildings -- Vietnam -- Ho Chi Minh City.

LCSH: Foundations.

LCSH: Soil Mechanics.

Abstract: Nowadays, the wave of construction of high-rise buildings, which usually use the concept of piled group foundations in their design, has increased in Ho Chi Minh City as well as other cities in Viet Nam. However, piled raft foundations are widely used and effective in supporting high-rise buildings worldwide. In this research, based on monitoring settlement, the Poulos-DavisRandolph (PDR) method, and three-dimensional (3D) numerical analysis method using PLAXIS 3D, the settlement, load sharing ratio, and behavior of piled raft in Ho Chi Minh City, Viet Nam were investigated. Besides, the groundwater level (GWL) change effect on the piled raft foundation was investigated using PLAXIS 3D. The GWL change due to the global groundwater pumping and dewatering was simulated based on the GWL reduction and consolidation in PLAXIS 3D. The results of settlement monitoring of a high-rise building in Ho Chi Minh City showed that the foundation design of this building was conservative, with a ratio of allowable-to-actual settlement of 9.3. The settlement comparison results between the measurements, simplified analysis method, and threedimensional (3D) numerical analysis using PLAXIS 3D were in good agreement. The parametric analysis indicated that the piled spacing/piled diameter was 5 - 7 times the recommended optimum value in the design. Furthermore, increasing the pile length, number of piles, depth of raft, decreased settlement. The pile length was equal to 30 times the pile diameter, which was effective for the settlement in both PDR method and PLAXIS 3D. In addition, the raft load share reached 30% and 66% of the applied load in PDR method and PLAXIS 3D method, respectively, when the raft was put in the second layer of stiff-to-very-stiff clay. The proposed model of piled raft foundations could reduce 49.61% of the total foundation cost. The settlement increased with the GWL reduced, causing groundwater pumping and dewatering. The subsidence started effect on piled raft foundation in Ho Chi Minh City 2.5 years after construction in the actual design and 3.4 years in the optimal case due to global groundwater pumping. The pile's axial force, which was affected by the negative skin friction, increased during that time. This research can assist practicing engineers in selecting pile and raft parameters in the design of piled raft foundations to produce an economical design for high-rise buildings in Ho Chi Minh City, Viet Nam, and other's locations.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Kamol Amornfa

Role: Thesis Advisor

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/ha-tran-all.pdf

CallNumber: TA780.Q36

eng

Spatial: Vietnam Ho Chi Minh City.

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Civil Engineering

Grantor: Kasetsart University

©copyrights Kasetsart University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	ha-tran-all.pdf	9.18 MB

ใช้เวลา

0.036283 วินาที