Behaviour of deep excavation using earth retaining structures with auxiliary measures in Bangkok subsoils | |
| Author | Nadzru, Najiha |
| Call Number | AIT Thesis no.GE-15-12 |
| Subject(s) | Excavation--Thailand--Bangkok Subsoils--Thailand--Bangkok |
| Note | A thesissubmitted in partial fulfilment of the requirements for the Degree of Master of Engineering in Geotechnical and Earth Resources Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-15-12 |
| Abstract | This thesis studiedthe behavior of 800mm thick diaphragm wall in Bangkok clay soil subjected to parametric cases using different wall depth, auxiliary methods and numbersof struts bracings using finite element method from a commercial geotechnical software PLAXIS 2D and 3D Version 2013. Four main cases of analyses are done using the diaphragm wall with internal bracings, diaphragm wall with jet grouting, T-shapeddiaphragm wall and combination of T-shapeddiaphragm wall and jet grouting. The ground parameters were used based on the compiled previous researches data and the structural parameters are calculated using 800mm thick diaphragm wall and struts (assume as fixed anchor) with spacing at 3m. The lateral wall movement shapes are typically maximum at the deeper exaction except for T-shapeddiaphragm wall 2-D analysis that shows its maximum value at top of excavation stage. A comparison study wasalso done for 2-D and 3-D results for the wall movement, bending moment and forces diagram for the cases. The outcome result generally agrees with previous researches, and for auxiliary measure using T-shapeddiaphragm wall shows marked improvement from 2-D to 3-D due to the corner and stiffening effects of the buttress are shown to have an effect in improving the wall movement result and better reflected in 3-D than 2-D. Jet grouting is shown to be most effective auxiliary measure in reducing the wall movement. Effects due to stress change due to different soil layer and effects of stiffness of retaining wall are also studied and showed that it is not necessary for wall with higher stiffness such as using T-shapeddiaphragm wall which may not necessarily reduce more wall movement than linear walls and complimentary auxiliary measure such as jet grouting can be more effective. 2-D analysis is still important for preliminary analysis as primary criterion to study different methods and type of excavation before doing the 3-D analysis because it is less complicated than 3-D. In addition, 2-D analysis helpsto validate the 3-D result by enhancing cost-efficiency and safety in the design. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-15-12 |
| 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) | Noppadol Phien-wej; |
| Examination Committee(s) | Pham Huy Giao;Chotchai Charoenngam; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2016 |