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Geotechnical & Foundation Engineering Co., Ltd. (GFE) is a member of TEAM Group, Thailand’s largest Thai-owned conglomeration providing integrated services in engineering, environment, management and related businesses. With over 35 years of experiences.

 

 

 

 

 


 

GEOLOGY AND GEOTECHNICS

 

With our highly experienced team of geotechnicals engineers, foundation engineers and geologists, we can provide professional services for geological and geotechnicals investigations, soil and rock testing, geo-hazard mapping, as well as groundwater study.

 

 

 

 

 


 

FOUNDATION AND REHABILITATION

 

On foundation and rehabilitation works, our experienced team of geotechnicals engineers, foundation engineers and geologists, offer professional services on foundation design and testing, foundation rehabilitation, forensic engineering, and more.

 

 

 

 

 


 

HYDROPOWER AND DAMS

 

Since our beginning, GFE has been involved in all stages of development of more than 30 dam and hydropower projects, and in a variety of aspects, from geological and seismic study, foundation treatment, slope excavation, to dam safety, monitoring, and rehabilitation.


 

 

 

 


 

TUNNELS AND UNDERGROUND STRUCTURES

 

With a wide spectrum of engineering skills available, we are able to provide our services for planning, design, and construction supervision on rock tunnels, soft ground tunnels, caverns, and other underground structures.

 

 

 

 

 


 

HIGHWAYS AND RAILWAYS

 

With our team of geotechnical engineers, foundation engineers and geologists, we provide state-of-the-art solution for geological and geotechnical investigations, feasibility study, conceptual design, tender and contract documents, detailed design, construction supervision, monitoring system as well as research & development for all types of highway and railway projetcs.

 

 

 

 


Numerical Analyses of Piled Raft Foundation in Soft Soil Using 3D-FEM

ABSTRACT: In recent years, the piled raft foundation has been widely accepted as one of the most economical methods of foundation systems. To evaluate the possibility of implementing this system in a very soft ground condition, this research performed the numerical analyses of the piled raft and pile group foundation systems for low-rise (8-storey) and high-rise (25-storey) buildings with 1-2 basement levels in subsoil conditions of the central part of Thailand, using three-dimensional Finite Element Method. The soils are modelled with Hardening Soil model and Mohr-Coulomb model. Evaluations of the performances of piled raft foundation, i.e., the load sharing ratio of piles, settlement behaviors in both the foundation system and the raft are discussed in comparison with those of the pile group. With limited cases considered and assumptions in this study, the results suggest the potential of using the piled raft system for low-rise building having 2 levels of basement. With this condition, the raft can carry some bearing capacity from pile around 20%. However, the safety factor of piles in the foundation design seems to play a key role on the effectiveness of the piled raft foundation as well and should be further studied.

EXPERIMENTAL AND NUMERICAL STUDIES ON PUSH-UP LOAD TESTS FOR SAND PLUGS IN A STEEL PIPE PILE

This paper focuses on the bearing capacity of soil plugs (internal shaft resistance) though fundamental research on the bearing mechanism of dry silica sand plugs. Push-up load tests on the dry silica sand plugs inside a model pipe pile and DEM simulations were carried out to investigate the plugging behavior. The influences of the packing state of the soil plugs (the relative density), and the height of the plugs on the bearing capacity were investigated. Prior to the push-up load tests, element tests on the silica sand and DEM analyses were performed to characterize the silica sand and to determine suitable DEM analysis parameters. The experimental and DEM results clearly show that the push-up force increases sigmificantly with the increase in the aspect ration of the soil plug, H/D, and with the relative density of the soil plug. The DEM analyses show a good agreement with the experimental results when the push-up force is small. Furthermore, the DEM results reveal that only density of the soil plug in the lower portion, adjacent to the pile tip, increases gradually with the increase in the push-up displacement as well as the increase in H/D. Hence, it is the lower portion of the soil plug that mainly controls the capacity of the soil plug.

APPROXIMATE NUMBERICAL ANALYSIS OF A LARGE PILED RAFT FOUNDATION

An approximate method of analysis has been developed to estimate the settlement and load distribution of large piled raft foundations. In the method the raft is modelled as a thin plate, and the piles and the soil are treated as inter-active springs. Both the resistances of the piles as well as the raft base are incorporated into the model. Pile-soil-pile interaction, pile-soil-raft interaction and raft-soil-raft interaction are taken into account based on Mindlin’s solutions. The proposed method makes it possible to solve problems of large non-uniformly arranged piled rafts in a time-saving way using a PC. The method can also be used for the deformation analysis of pile groups be setting the soil resistance at the raft base equal to zero. The validity of the proposed method is verified through comparisons with existing solutions. Two case studies on settlement analyses of a free-standing pile group and a large piled raft are presented. In the analyses, applicability of the equivalent pier concept is also examined and discussed. The computed settlements compare favorably with the field measurements