Geological hazards in tunnelling: the example of Gelas water conveyance tunnel, Iran
| Autor: | Zeynab Maleki, Arash Nikvar-Hassani, Hadi Farhadian |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0211 other engineering and technologies
Geology Excavation 02 engineering and technology Inflow 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Hazard Mining engineering Hazardous waste Earth and Planetary Sciences (miscellaneous) Geologic hazards Environmental science Groundwater Quantum tunnelling 021101 geological & geomatics engineering 0105 earth and related environmental sciences Underground space |
| Zdroj: | Quarterly Journal of Engineering Geology and Hydrogeology. 54 |
| ISSN: | 2041-4803 1470-9236 |
| DOI: | 10.1144/qjegh2019-114 |
| Popis: | The characterization of geological hazards is of great importance to underground space, in particular, tunnelling projects since it plays a critical role in selection of the tunnel route, the type and characteristics of the excavation, and adopted technology. Also, it is known as the fundamental step for the designation and construction of tunnelling related structures. Tunnelling projects encounter various geological hazards, in particular, those associated with the ground conditions, groundwater level, and in situ stress regime. The aim of this study was to identify the probable hazards affecting the alignment of the Gelas Water Conveyance Tunnel and the magnitude of risks for various sections along the tunnel route. Following a literature review on geological hazards of tunnelling projects with similar geological conditions, several potentially hazardous parameters were identified for assessment including squeezing, and groundwater inflow. In this regard, to assess geological hazards along the tunnel route, geotechnical characteristics of the rock masses have been evaluated based on laboratory and field investigations. Seven sections along the tunnel route were selected to study the squeezing and water inflow hazards, as well as their degree of occurrence using various techniques exist in the literature. Empirical, semi-empirical, and theoretical-analytical methods were used for assessing the squeezing potential. Analytical methods were applied for prediction of the groundwater inflow and then, the Site Groundwater Rating (SGR), as well as, the Tunnel Inflow Classification (TIC) methods were adopted for classifying the tunnel route from groundwater inflow hazard perspective. The results indicated that areas where faults and crushed zones are located are highly susceptible to groundwater inrush, and squeezing. |
| Databáze: | OpenAIRE |
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