Evaluation of TAM grouting effectiveness for the metropolitan waterworks authority (MWA) project | |
| Author | Thanaphon Saelao |
| Call Number | AIT Thesis no.GE-22-02 |
| Subject(s) | Excavation Grouting (Soil stabilization)--Evaluation |
| 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 | The construction of deep excavation involves potential uplift forces and water leakage due to high water pressure. The Tube-a-Manchette (TAM) grouting technique was implemented in a 35-meter deep excavation retained by a 58-meter deep diaphragm wall to alleviate these issues. The grouting zone was located in a silty sand layer, and cement-bentonite (CB) grout and sodium silicate (MK) grout were used in the first and second stages, respectively. Volume control grouting was performed on site, with injection port pressures recorded. The pressure distribution plot and field pumping test were conducted to evaluate the grouting quality. The uplift stability analysis was conducted using weight balance equation. Results showed improved stability of the bottom shaft after grouting work was completed, with a factor of safety ranging from 1.07 to 1.12 after excavation. The injection pressure of each port was within the design range (< 25 Bars) showed the very good uniformity distribution and very limit damage to the surrounding soil, and the permeability of the improved soil was reduced by about 10 times. Additionally, a comparison between the MWA project and similar projects in Thailand and Taiwan demonstrated the positive outcomes of the grouting work in this project for other silty sand sites with similar grouting parameters. These findings suggest that the TAM grouting method is effective in controlling uplift forces and water leakage in deep shaft constructions for water tunnels, and can be used in other similar projects. |
| Year | 2023 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Chao, Kuo-Chieh |
| Examination Committee(s) | Avirut Puttiwongrak; |
| Scholarship Donor(s) | His Majesty the King's Scholarships (Thailand) |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2023 |