Performance of hard rock TBMS in water diversion tunnel construction in complex rocks in Chiangmai | |
| Author | Raphiphan Onsibut |
| Call Number | AIT Thesis no.GE-20-07 |
| Subject(s) | Tunneling--Design and construction Boring machinery--Thailand--Chiangmai Geotechnical engineering--Thailand--Chiangmai |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The initiative double shield TBMs (DS TBMs) were selected to excavate in the complex geological structures in the water diversion tunnel construction projects in Chiangmai, Northern Thailand. The effects of the adverse ground conditions were an impact on the time of tunnel construction. Since the TBM tunneling contains several factors to control in the TBM excavation and the tunnel construction, the overall machine performance and factors controlling the TBM performance are important to summarize in detail. Machine utilization is the most important factor illustrating the overall TBM performance related to the time of construction. The utilization factors can be categorized for each activity of TBM tunneling by the machine performance records. In other words, the TBM boring cycle is necessary to extract the main activities and the TBM downtimes. Furthermore, the major incidences during TBM excavation need to be comprehended as the key parameter indicating the machine performance in the problematic zones. The DS TBM of the Unique Engineering and Construction Public Company Limited (UN) was summarized the tunneling time consumption and evaluated by the machine utilization. The boring cycle time of the UN TBM was explicitly described as the components affecting the TBM productivity. The consistency of TBM boring was an important key to increase productivity, while the standstills have to be reduced as much as possible. Both DS TBMs have been proved that the cutterhead coefficient (CC) and the field penetration index (FPI) can be clearly indicated the problematic zone when the CC decreases to 0.05, whereas the FPI sharply increases as more than a mean. Likewise, the DS TBM of the Right Tunnelling Public Company Limited (RT) was also used the CC and the FPI as the prior key indicators for reviewing the machine performance in difficult ground conditions. In conclusion, the overall machine performance of the TBM tunneling in the complex thrust zones could be recapped so far. The machine utilization and the TBM boring cycle are the essential factors considering an impact on the time of construction. Additionally, the CC and the FPI should be used to warn the problematic zones in the adverse ground conditions with other operational parameters. |
| Year | 2021 |
| 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;Noppadol Phien-Wej (Co-Chairperson); |
| Examination Committee(s) | Avirut Putiwongrak;Pham, Huy Giao,; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2021 |