Portal slope stability assessment of a proposed highway tunnel in northeastern Turkey

Date

2009-01-01

Author

Sopaci, E.
Akgün, Haluk

Metadata

Show full item record

Item Usage Stats

190
views

0
downloads

This paper presents an application of the rock mass classification systems, namely, Geomechanics Classification System (RMR), Geological Strength Index (GSI) and the newly adapted A-RMR for the characterization of the rock masses surrounding the portals of the Ordu Peripheral Highway Tunnel. In order to characterize the rock masses, which mainly consist of flysch (mostly alternation of sandstone, marl and siltstone) and pyroclastics (agglomerate and tuff), engineering geological investigations have been carried out in three stages as surface, subsurface and laboratory investigations along the tunnel route. Sixteen boreholes with a total length of 1497 m have been drilled along the tunnel route to assist and verify rock mass classifications. Approximately, seventy five rock core samples have been obtained for rock mechanics tests. The shear strength and geomechanical properties of the rock masses were assigned as a result of a synthesis of the results of laboratory testing, GSI, RMR and the newly adapted A-RMR methods. The information provided from all investigations has been gathered and handled for the characterization of the rock masses governing the portal slope stability of open-cut excavations of the tunnel. Kinematical and limit equilibrium analyses of the tunnel portals have been employed for portal slope stability considerations.

Subject Keywords

Rock mass classification, Weak rock, Slope stability

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055024677&origin=inward
https://hdl.handle.net/11511/73041

Conference Name

ISRM International Symposium on Rock Mechanics 2009 (19 - 22 Mayıs 2009 )

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Tunnel and portal stability assessment in weak rock Koçkar, Mustafa Kerem; Akgün, Haluk (null; 2005-05-12) The purpose of this study is to present an algorithm for tunnel and portal support design in weak rock conditions. Basic principles of engineering design are introduced and the main stages of the design process are delineated through assessing a highway tunnel case study in Turkey. This case study involved the investigation of the engineering geological and geotechnical characteristics of the rock material and rock mass of the tunnel grounds; evaluation of the field stresses, the applied loads and the defor...
Fuzzy approach in preliminary design of weak rock slopes for lignite mines Yardımcı, Ahmet Güneş; Karpuz, Celal; Department of Mining Engineering (2013) Slope mass rating (SMR) system, which is an enhanced version of rock mass rating (RMR), is a useful tool to be utilized for the preliminary stability analysis of rock slopes. Parameter scoring systems of both conventional RMR and SMR systems are based on crisp set theory. Common problems of conventional classification systems are assigning sharp boundaries for ranges, the same values for both upper and lower limits of ranges and presence of uncertainties as a result of complex nature of rock. These problems...
Rock mass characterization and primary support design for the Boztepe Tunnel, Turkey Sopaci, E.; Akgün, Haluk; Akinci, M. (Taylor & Francis Group -CRC Press; 2005-12-01) The Ordu province in local scale and northeastern Turkey in regional scale comprise of volcanic arc related rock masses. These modes of origin accommodate both volcanic and flysch type rock masses that have transitions so often with each other. The Boztepe tunnel will mostly be driven through this type of lithol-ogy. In order to assess the rock masses surrounding the tunnel from a geotechnical point of view; surface, subsurface and laboratory investigations have been implemented. Internationally accepted ro...
Assessment of rock slope stability by slope mass rating (SMR): A case study for the gas flare site in Assalouyeh, South of Iran AZARAFZA, Mohammad; Akgün, Haluk; ASGHARI-KALJAHI, Ebrahim (2017-10-01) Slope mass rating (SMR) is commonly used for the geomechanical classification of rock masses in an attempt to evaluate the stability of slopes. SMR is calculated from the RMR89-basic (basic rock mass rating) and from the characteristic features of discontinuities, and may be applied to slope stability analysis as well as to slope support recommendations.
Numerical modeling of discontinuous rock slopes utilizing the 3DDGM (three-dimensional discontinuity geometrical modeling) method Azarafza, Mohammad; Asghari-Kaljahi, Ebrahim; Akgün, Haluk (Springer Science and Business Media LLC, 2016-5-5) The geometry of discontinuities in a rock mass is one of the most important influences on the behavior and characteristics of that rock mass. The geometry of discontinuities largely determines the stability of the rock mass, as well as appropriate methods for reinforcing and stabilizing that mass. This study introduces the 3DDGM (three-dimensional discontinuity geometrical modeling) method, which is based on the 3DGM (three-dimensional geometrical modeling) algorithm that was developed using the Mathematica...

Citation Formats

E. Sopaci and H. Akgün, “Portal slope stability assessment of a proposed highway tunnel in northeastern Turkey,” The University of Hong KongHong Kong; China, 2009, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055024677&origin=inward.