Factors affecting a non-uniform settlement of composite dam and dam crest rehabilitation by GRS composited sheet pile (case study Mae Suai Dam, Thailand)

Name: Khemmawit Wannasiri

LCSH: Kasetsart University -- Dissertations. Ph.D. (Civil Engineering) 2023

Classification :.LCCS: TA775

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

LCSH: Settlement of structures

LCSH: Earth dams

LCSH: Sheet - piling

LCSH: Piling (Civil engineering)

Abstract: Mae Suai dam is an earth zone dam with RCC section in the center of downstream slope located at Mae Suai district, Chiang Rai, Thailand. The differential settlement at the joint between RCC spillway and the earth-filled section caused leakage near the crest of the dam. This unusual settlement is the result of a joint where materials of different stiffness are connected, the settlement pattern depends on the shape and interface shear strength of the contact area. Nonuniform settlement was investigated by 2D & 3D FEM using MIDAS GTS for Fully-Coupled Stress-Seepage analyses. The results of finite element analyses were verified with the geodetic measurements data and observation in rehabilitation processes. Roughness and taper effects were studied by analyzing the settlement along the dam crest using 2D FEM analysis by varying the interface stiffness between the earth dam and RCC spillway to characterize the settlement of each condition and verified with the geodetic measurements. Furthermore, the MSE walls were used for dam crest rehabilitation, welding mesh gabion was used as the facing on both sides, the polymetric geogrid and rebar were used as reinforcements. The MSE walls was placed on the original earth dam crest, steel sheet pile was installed at upstream and downstream side to prevent leakage and control the settlement of the new dam crest. The instruments were installed at various test sections to careful field monitoring to obtain high-quality data. In this research, the analysis results were divided in 2 parts: 1) geometry and roughness effect at the RCC interface-earth dam causing leakage, the analysis revealed that the effect of roughness and taper resulted in non-uniform settlement. If these types of dam structures are selected in other projects, the pattern of settlement should be considered in accordance with the guidelines for dam crest design to prevent damage and leakage caused by the non-uniform settlement of the dam. 2) behavior monitoring of back-to-back MSE Walls for dam crest rehabilitation, the results obtained from 2D finite element for dam crest rehabilitation were in good agreement with the field measurements, the lateral deformation and settlements were very small. The axial forces in rebar reinforcement were found to be continually changing due to deformation of foundation, external stimuli and construction factors. Likewise, the strain measured in all positions of geogrid reinforcement was very low. Combining steel reinforcement (high stiffness) with geogrid reinforcement (low stiffness) was redundant. Most of the lateral stresses are resisted by the former than the later.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Suttisak Soralump

Role: Thesis Advisor

Name: Suriyon Prempramote

Role: Thesis CO-Advisor

Created: 2023

Modified: 2025-07-27

Issued: 2025-07-27

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2566/khemmawit-wan-all.pdf

CallNumber: TA775 .K44

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Civil Engineering

Grantor: Kasetsart University

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