We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Hazards of mechanized tunnel excavation in HS bearing ground in Aspar tunnel, Iran.
- Authors
Mirmehrabi, Hossein; Ghafoori, Mohammad; Lashkaripour, Gholamreza; Tarigh Azali, Sadegh; Hassanpour, Jafar
- Abstract
Occurrence of hydrogen sulfide gas (HS) is one of the most important engineering geological hazards during tunneling. Its hazards and consequent challenges are very difficult and costly to solve. During site investigation, one of the tasks for engineering geologists is prediction and evaluation of the risk of HS gas in the underground spaces. In this study, water conveyance tunnel of Aspar, which was excavated in HS-bearing environments, is discussed. The tunnel is excavated in the hydrocarbon formations. Applied experiments suggest that geological formations pertaining to hydrocarbon resources are crucial in formation and reservation of HS gas. This paper briefly discusses hazards and geological sources of HS, as well as remedial measures for decreasing the risks and problems in excavation of the tunnel. To predict the risk of HS gas in the underground spaces, it is possible to use some precursors such as: sulfur springs, organic traces, organic argillaceous rocks, exposure of HS odor from fresh surface of rock and smell of HS during boreholes drilling. Controlling the inflow of groundwater into the excavation, diluting the concentration of HS, training the personnel and utilization of some proper safety equipment have been used to mitigate risks and problems in tunnel excavation.
- Subjects
IRAN; HYDROGEN sulfide; TUNNEL design &; construction; ENGINEERING geologists; TUNNELS; DRILLING &; boring
- Publication
Environmental Earth Sciences, 2012, Vol 66, Issue 2, p529
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-011-1262-y