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ANALYTICAL STUDY ON THE SWELLING BEHAVIOR IN TUNNELING OF CLAY/SULFATE FORMATIONS- ISFAHAN SUBWAY TUNNEL

Ehsan Moosavi

Abstract

Soil Swelling is a relatively complicated phenomenon not yet fully understood by researchers; however, it has been proved to be a physiochemical phenomenon related to soil and location. A tunnel support system can undergo failure upon completion of construction unless sufficient knowledge of expansive soil behavior is obtained and due procedures are followed to prevent the adverse effects thereof. This is a comprehensive study conducted on the physiochemical parameters affecting soil expansion, aimed at determining the best tunneling conditions at sites with expansive soils. The analysis was performed by the Finite Difference Method (FDM) using FLAC, that FLAC was used for modeling the expensive parameters in Isfahan?s subway tunnel. The stress path method was implemented to determine where the expansive stresses were applied. The stress release area was defined as the loci of points where the first stress invariant after excavation was less than that before excavation. The major contributions of this paper are therefore the development of modelling to estimate the swelling potential of clay?sulfate rocks based on a FLAC software. Examination of soil expansively by conducting tests at the site of Isfahan?s subway tunnel revealed that this soil was capable of withstanding the overload resulting from soil expansion.

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DOI resolver: doi.org/10.5593/sgem2019/1.2/s02.008

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