Comparison results of Two-dimensional resistivity inversion with geological conditions in the along excavation of phases 3 and 4 of Ghomroud tunnel

Document Type : Original Article

Authors

1 Department of Underground Structures, Sahel Omid Iranian Consultant Engineers Co.,

2 Professor, Department of Engineering Geology, Isfahan University

3 Department of Geology, Zayand Ab consultant engineers Co.

Abstract

The study area of this research is located in the geological zone of Sanandaj, Sirjan. In this area, numerous tectonic movements have caused a lot of faults, crushed zones and numerous fractures in the rock masses. In the Site studies of the 3rd and 4th tunnel sections of ghomroud, subplane studies have been limited and the findings from exploratory boreholes have not led to the identification of subsurface conditions in critical areas. The adverse geological conditions have caused TBM stops and long-delayed delays (about 600 days of complete stop) in the drilling process. Faults zones are main effective causes of the TBM stops. In this study, with a two-dimensional ainversion of resistivity data,, the potential of geophysical studies of the design for the identification of subsurface conditions in the drilling pathway has been investigated. Based on the results of two-dimensional analysis, the distribution of geological layers based on their specific resistance is presented. There are several zones with a very low specific resistance to the tunnel route, which is in accordance with the location of crushed and fault zones, as well as lithological changes in the drilling path. Two-dimensional processing of resistance data provides the possibility of obtaining relevant information on subterranean conditions that could be used in the stage of site studies (Locating of exploration borehole and ...) as well as in the implementation of the tunnel

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References

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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 11, Issue 1
June 2019
Pages 49-64

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History

  • Receive Date: 30 September 2018
  • Revise Date: 20 December 2018
  • Accept Date: 24 December 2018

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