Investigation of tunneling hazards in difficult and complex ground with the integration of geological and geophysical studies - Case study of Sabzkuh tunnel

Document Type : Original Article

Authors

1 M.Sc. Student, Department of Civil & Geotechnical Engineering, Islamic Azad University Islamshahr Branch.

2 Assistant Professor, Department of Civil & Geotechnical Engineering, Islamic Azad University Islamshahr Branch.

Abstract

Tunneling in the Zagros region of Iran has been endangered by many geological complications. Many faults, landslides, groundwater levels are among the hazards that affect the tunneling process. The Sabzkuh - Choghakhhor Water Transfer Tunnel is about 11 km long in the Zagros Mountains in southwestern Iran using conventional and mechanized tunneling techniques under excavation. Initial studies showed that about 350 meters from the tunnel in the alluvium. After excavation 37 m from the tunnel in a conventional, geological problems and inappropriate tunnel excavation method caused the tunnel to collapse and the tunnel portal failure. In order to cross the collapse zone and continue the safe excavation, due to the complexity of the tunnel route and the limited results of the early geotechnical studies in identifying the leading hazards in the elementary part of the Sabzkuh tunnel, a comprehensive program of studies including complementary geotechnics, field surveys and geophysics became. The combination of these studies resulted in a wider and more comprehensive level of information about the study area, which led to a more informed and better informed decision about the identification of hazards and, finally, the development of a geological model with minimal risk.

Keywords

References

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Civil Infrastructure Researches
Volume 3, Issue 1 - Serial Number 1
September 2017
Pages 39-49

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