Evaluation of ground response in Sanyi tunnel, Taiwan | |
| Author | Hsu, Chih-hong |
| Call Number | AIT Thesis no. GE-95-10 |
| Subject(s) | Tunneling--Taiwan Rock mechanics |
| Note | A thesis research submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-95-10 |
| Abstract | In this study, the construction history, the excavation sequences and the support types of the Sanyi No.1 Tunnel are introduced briefly. The geological information obtained from the site investigation stage and the tunnelling survey are extensively reviewed and used to identify the factors that influencing the tunnel instability. The geological hazards such as faults, shear zones, bedding planes, joint sets, and severe water problems are investigated and recorded during the tunnelling progress and the investigation showed that the poor rock conditions, the discontinuity systems ( especially the bedding plane ) together with the ingress of groundwater contributed to the tunnel instability. The actually used support types are compared to those estimated by the RMR values and it can be seen that RMR System does not fit well for the poor rock conditions in this site but if provided a useful quantitative assessment for the tunnelling decisions. The monitored convergence data induced by top heading advance, although part of the total ones, still show a sign to the tunnelling decisions and are evaluated in terms of the unexpected conditions, the rate of the face advance, and the depth of overburden. The effect of the funnel face advance on the rock closure is found to still exist within about 3 0 m ( 3 tunnel diameters ) behind the tunnel face or within about 10 ~ 15 days. The time-dependent displacement can be further distinguished and discussed. By means of the convergence devices installed and recorded behind the top heading face and ahead of the bench face, the approximate face-induced displacement ( occurred both ahead of and behind the bench face ) can be estimated. This face-induced displacement is further employed for back analysis of the strength and deformability property of the ground by using a FEM program. The result shows that the back-calculated parameters are extremely low when compared to those predicted by the RMR value. |
| Year | 1996 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-95-10 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Noppadol Phien-wej; |
| Examination Committee(s) | Sugimoto, Mitsutaka ;Ashford, Scott A. |
| Scholarship Donor(s) | United Geotech, Inc. - Taiwan. ; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1996 |