Using integration of geoelectric and MASW surveys for investigation of subsurface strength changes due to pile installation : a case study of Bangkok's soft clay embankment | |
| Author | Khin Nyein Chan Kyaw |
| Call Number | AIT Thesis no.GE-23-08 |
| Subject(s) | Clay--Testing--Thailand--Bangkok Embankments--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Earth Resources Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Embankments built on soft clay soils in Bangkok pose significant challenges in civil engineering due to their susceptibility to cracking and failure. To address this, the Department of Rural Road, Thailand, has implemented a ground improvement strategy involving square-shaped concrete-driven piles. The study investigates the effectiveness of using 2D Geo-electric surveys alongside Multi-Channel Analysis of Surface Waves (MASW) to investigate the verticality of the piles and subsurface strength changes after employing piled embankment on the soft clay in Ayutthaya, Thailand. The study comprises a comprehensive investigation of subsurface conditions through 2D Geo-electric surveys and MASW survey conducted both non pile and pile installationd to determine electrical resistivity and shear wave velocity in both pile and non-pile installationrespectively. Assessing pile verticality using 2D ERI surveys poses challenges in this project. The analysis results of electrical resistivity fail to determine the actual depth of the piles accurately. Additionally, interpreting the chargeability results obtained from 2D ERI surveys proves to be highly complicated in investigating the depth of piles. However, integrating Electrical Resistivity Imaging (ERI) with Multi-Channel Analysis of Surface Waves (MASW) offers valuable insights into subsurface changes in pile installation. Significant increases in both electrical resistivity and MAWS-derived shear wave velocity following pile installation show that the subsurface is more rigid than before and helps to picture strength changes in that composite material. Also, the Unconfined compression test validates the significant increases in soil stiffness after pile embedding, offering insight into the stress-strain behavior of the composite material which is soft clay with piles. Remarkably, despite soil failure, the piles demonstrate substantial load-bearing capacity. he results of the study indicate that the integration of Geo-electric and MASW surveys offers a robust approach to assessing subsurface conditions and evaluating the effectiveness of piled embankment ground improvement techniques in soft clay. |
| Year | 2024 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Earth Resources Engineering (GTE)/Former name = Geotechnical Engineering (GE) |
| Chairperson(s) | Avirut Puttiwongrak; |
| Examination Committee(s) | Chao, Kuo Chieh;Taweephong Suksawat; |
| Scholarship Donor(s) | Right Tunneling PCL Scholarship;AIT Scholarships; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |