alexa A New Method to Predict Ratio of Width to Height Rock Pillar in Twin Circular Tunnels
ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

A New Method to Predict Ratio of Width to Height Rock Pillar in Twin Circular Tunnels

Asghar Siahmansouri1*, Javad Gholamnejad2 and Mohammad Fatehi Marji3
1M.Sc. Student, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
2Associate Professor, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
3Associate Professor, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
*Corresponding Author : Asghar Siahmansouri, M.Sc. student
Department of Mining and Metallurgical Engineering
Yazd University, Yazd, Iran
E-mail:[email protected]
Received February 10, 2012; Accepted April 30, 2012; Published May 02, 2012
Citation: Siahmansouri A, Gholamnejad J, Marji MF (2012) A New Method to Predict Ratio of Width to Height Rock Pillar in Twin Circular Tunnels. J Geol Geosci 1: 103.doi:10.4172/2329-6755.1000103
Copyright: © 2012 Siahmansouri A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Twin tunnels can be used for many applications. Interaction between two tunnels is an important problem in tunnel engineering that should be studied specially. Numerical investigations are well adapted to field data and numerical methods can be used in design of rock pillar of twin circular tunnels. So far no relationship has been provided to estimate the minimum stable rock pillar. In this paper the interaction between twin circular tunnels has been studied using 2D finite element analysis. To do this, a great number of twin tunnels were modeled in Phase2 software with different conditions of rock mass (RMR value) and depth of tunnel. Models were analyzed and minimum stable rock pillar was determined. This process was repeated for three different ratios of K (ratio of horizontal stress to vertical stress, 0.5, 1 and 1.5). Finally, according to the linear and nonlinear regression methods, the best merit function was fitted to result of numerical analysis. Then, a new approximate formula was proposed to predict ratio of width to height rock pillar according to RMR value and depth of twin circular tunnels with different K values. The formulae are very accurate (coefficient of correlation equals to 0.96) that can be used for predicting ratio of width to height rock pillar in twin circular tunnels.

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