Dr. Bestun Shwan, a Lecturer and head of the Department of Geotechnical Engineering (DGEN), Faculty of Engineering at Koya University participated the 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019) by presenting a scientific paper entitled “The effect of suction on ground surface settlement for a tunnel”. The international symposium was held at the University of Strathclyde, Glasgow.
The paper reported a series of 1g tests of a tunnel buried 25 mm into a fine sand at various saturation conditions: dry, saturated and unsaturated. The experimental results of the surface settlement and the particle size velocimetry (PIV) results are presented. The conference published papers are indexed by Scopus.
About the conference:
Title: 7th International Symposium on Deformation Characteristics of Geomaterials IS-Glasgow 2019
Website: https://www.is-glasgow2019.org.uk/Home/tabid/7135/Default.aspx
Location: University of Strathclyde, Glasgow,UK
Date: 26th – 28th June 2019
About the paper:
Title: The effect of suction on ground surface settlement for a tunnel
Author: Bestun Shwan
DOI: https://doi.org/10.1051/e3sconf/20199217008
Type: Open Access
Download: PDF
Abstract
This paper addresses the physical modelling of a tunnel for saturated and unsaturated sand as well as tests in dry condition. A series of tests were conducted for a 50 mm diameter tunnel buried 25 mm into a poorly graded fine sand under different normal stresses: 0.78, 1.56, 2.34 and 3.31 kPa. Suction was controlled by means of the hanging column technique (HCT). Particle image velocimetry (PIV) was also utilised to obtain the vector displacement and compared with the results of the physical modelling. The results of the fully saturated sample showed that the sample experienced a sudden spatial collapse above and around the tunnel's crown. In addition, large displacement on top of the tunnel's crown was also observed for the fully dry case. However, the unsaturated sample did not experience any sudden collapse. This was attributed to the effect of the suction contribution on strength.
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Koya University (KOU) is located in the city of Koya (Koy Sanjaq) which is 1.0 hr drive to the East of the Kurdistan Region capital Erbil (Arbil, Hewlér) in Kurdistan Region of F.R. Iraq. It is on the foothills of beautiful high mountain. Its campus has been carefully laid out to embrace the beautiful mountainous nature. . There are 4 Faculties and 2 Schools in KOU; Faculty of Engineering (FENG), Faculty of Science and Health (FSCH), Faculty of Education (FEDU), Faculty of Humanities and Social Silences (FHSS), Shcool of Physical Education (SPHE) and School of Medicine (SMED). Also, there are two research centers; Genome Center and Malai Gawra Center. Moreover, at KOU there is an English Language Center (BELC) at KOU has been opened with the sponsorship of IREX and American embassy in Baghdad as well as with the support of Spring International Language Center of The University of Arkansas. KOU has two Scientific Journals; ARO-The Scientific Journal of Koya University, which is indexed by Clarivate Analytics (ESCI), and Koya University Journal of Humanities and Social Sciences (KUJHSS). KOU is a proactive member of Erasmus/ Marhaba Project and Erasmus+. KOU signed many Memorandum of Understandings (MoU) with many International Universities, e.g., The University of Arkansas (June 2015). The Lulea University in Sweden (April 2014), The University of Nottingham in the UK, The University of Buckingham in the UK (Oct 2008), Belkin University in Turkey (Sep 2009) and The University of Greenwich in the UK.
