On the assessment of the effect of the anisotropy in in-situ stress on support pressure in tunnels

Date

2006-06-21

Author

Osgoui, Reza. R.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

186
views

0
downloads

This paper presents a newly empirical approach to estimate support pressure in rock tunnels. The new approach takes the rock mass quality (Geological Strength Index: GSI), the disturbance degree, the post-failure behavior, the size of tunnel, the state of in-situ stresses, and the squeezing-prone condition into consideration. A parametric study was, too, carried out using numerical analysis to investigate the influence of anisotropy in field stresses and the effect of the various shapes and sizes of tunnels on failure-height and support pressure in a variety quality of rock masses. Therefore, a correction factor for stress ratio (horizontal to vertical stress ratio: k) is recommended to adjust the support pressure. For this purpose, the rock masses with various ranges of quality were considered to stimulate the very poor, fair, and good quality rock masses whereas arch-shaped and rectangular tunnels were examined in an anisotropic state of field-stress.

Subject Keywords

Rock, Index

URI

https://hdl.handle.net/11511/63415

DOI

https://doi.org/10.1201/9781439833650.ch39

Collections

Department of Mining Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Application of ultrasonic burning rate measurement method on closed bombs Mumcu, Berkan; Kurtuluş, Dilek Funda; Arkun, Uğur; Department of Aerospace Engineering (2013) In this thesis study, detailed information about solid rocket motors and ultrasonic burning rate measurement method is given. An experimental setup is prepared for applying the ultrasonic burning rate measurement method. Before performing the burning tests, some pre-tests are performed for affirming the ultrasonic sensor and obtaining some experimental coefficients. Two different types of propellants, which do not include aluminum, are produced for the burning tests. The first type of the propellants has tw...
Evaluation of displacement coefficient method for seismically retrofitted buildings with various ductility capacities Dicleli, Murat (Wiley, 2014-07-25) This research study is aimed at evaluating the accuracy of the displacement coefficient method (DCM) of FEMA 440 and associated nonlinear static procedure (NLSP) for actual buildings with soft story mechanism and various ductility capacities. The DCM and associated NLSP are evaluated using two existing seismically vulnerable buildings with soft story mechanism. The buildings are first retrofitted using a ductile steel-brace-link system to represent those with good ductility capacity and then retrofitted wit...
EXPERIMENTAL INVESTIGATION OF THE EFFECTS OF WAVEFORM TIP INJECTION IN A LOW PRESSURE TURBINE CASCADE Mercan, Bayram; Dogan, Eda; Ostovan, Yashar; Uzol, Oğuz (2012-06-15) This paper presents the results of an experimental study that investigates the effects of uniform/waveform tip injection along the camberline on the total pressure loss and wake flow characteristics downstream of a row of Low Pressure Turbine (LPT) blades. The experiments are performed in a low speed cascade facility. This injection technique involves spanwise jets at the tip that are issued from a series of holes along the camber line normal to the freestream flow direction. The injection mass flow rate fr...
Evaluation of pushover analysis procedures for frame structure Oğuz, Sermin; Yakut, Ahmet; Department of Civil Engineering (2005) Pushover analysis involves certain approximations and simplifications that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. In literature, some improved pushover procedures have been proposed to overcome the certain limitations of traditional pushover procedures. The effects and the accuracy of invariant lateral load patterns utilised in pushover analysis to predict the behavior imposed on the structure due to randomly selected individual ground motions...
A Detailed Analysis for the Absorption Coefficient of Multilevel Uncooled Infrared Detectors Küçük, Serhat; Akın, Tayfun (2011-04-29) This paper introduces a detailed analysis on the calculation of the absorption coefficient of multilevel uncooled infrared detectors. The analysis is carried out considering a two-level 25 mu m pixel pitch infrared detector with a sandwich type resistor which is divided into sub-regions consisting of different stacks of layers. The absorption coefficients of these different sub-regions are calculated individually by using the cascaded transmission line model, including the main body, arms, and the regions w...

Citation Formats

R. R. Osgoui, “On the assessment of the effect of the anisotropy in in-situ stress on support pressure in tunnels,” 2006, p. 307, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63415.