Determination of Longitudinal Deformation Profile for Supported Tunnels (SLDP) Using Numerical Modeling

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Alinezhadi a.h.; RAHMANNEJAD R.

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Journal: JOURNAL OF ROCK MECHANICS Year:2017 | Volume:1 | Issue:1 Page(s): 25-33

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Title

Determination of Longitudinal Deformation Profile for Supported Tunnels (SLDP) Using Numerical Modeling

Author(s)

Alinezhadi a.h. | RAHMANNEJAD R. | Issue Writer Certificate

Keywords

Non-hydrostatic stress

Concrete lining

Support stiffness

FLAC3D

RMR

SLDP

LDP

Abstract

Summary This paper is aimed to introduce the Longitudinal Deformation Profile of supported tunnel. Tunnel depth, RMR value, coefficient of lateral pressure along with Support stiffness and non-supported length behind the tunnel face are selected as main effective parameters. Tunnel support may be concrete or shotcrete. To obtain the supported LDP curve which is known as LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP, FLAC3D numerical code is utilized. Statistical processing of numerical experiments allows us to drive some relations, characterizing different parts of LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP curve. Results show that existence of lining changes the shape and magnitude of deformation profile. Introduction Considering the importance of underground structures, selection of a suitable location for support system installation behind the tunnel face is of a great importance for stability analysis. The usual way to solve this problem is the application of LDP, one of the three tools of Convergence-Confinement method. The LDP is the graphical representation of the radial displacement that occurs along the axis of an unsupported cylindrical excavation for sections located ahead of and behind the excavation face. Many researchers, such as Panet and Guenot (1982), Panet (1993, 1995), Chern et al. (1998), Hoek (1999), Unlu and Gercek (2003), Vlachopoulos and Diederichs (2009) have suggested elastic or elastoplastic relations for the LDP. Anyway, these solutions do not incorporate the stiffness of support in the deformation profile. Other researchers including Bernaud and Rousset (1992), Nguyen-Minh and Corbetta (1991), Nguyen Minh and Guo (1993) and Bernaud and Rousset (1996), Vardakos (2007) discussed the effects of the support mechanical or geometrical characteristics in the deformation profile. Methodology and Approaches In this research, the LDP of supported tunnels was modeled using FLAC3D software and assuming the following conditions: non-circular lined tunnel in elasto-plastic rock mass with different RMR values (40-70), depth of overburden from 100 to 300 m, three values of in situ stress field (0. 5, 1 and 1. 5), changing length of non-support interval from 1 to 5 m and different Support stiffness. In order to differentiate supported LDP from non-supported one, it is named LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP. In LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP curves, deformation profile has a hump shape between the tunnel face and support edge. Also, the ultimate deformation of supported profiles is less than the non-supported ones. Based on the statistical processing of huge number of numerical modeling results for different combination of above mentioned parameters, a series of relations for calculation of different parts of LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP were presented. Results and Conclusions The LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP profile and given equations can be used to determine the final displacement and the displacements in the important points of non-supported interval, including tunnel face, at the peak of hump and edge of support system, however, the newly presented concept-LDP/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">SLDP is more practical than LDP for tunnels under construction. In addition, existing equations concerning supported tunnels are only applicable for circular tunnels under hydrostatic condition, while the presented equations are valid for non-circular tunnels under hydrostatic and non-hydrostatic conditions.

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APA: Copy

Alinezhadi, a.h., & RAHMANNEJAD, R.. (2017). Determination of Longitudinal Deformation Profile for Supported Tunnels (SLDP) Using Numerical Modeling. JOURNAL OF ROCK MECHANICS, 1(1 ), 25-33. SID. https://sid.ir/paper/268308/en

Vancouver: Copy

Alinezhadi a.h., RAHMANNEJAD R.. Determination of Longitudinal Deformation Profile for Supported Tunnels (SLDP) Using Numerical Modeling. JOURNAL OF ROCK MECHANICS[Internet]. 2017;1(1 ):25-33. Available from: https://sid.ir/paper/268308/en

IEEE: Copy

a.h. Alinezhadi, and R. RAHMANNEJAD, “Determination of Longitudinal Deformation Profile for Supported Tunnels (SLDP) Using Numerical Modeling,” JOURNAL OF ROCK MECHANICS, vol. 1, no. 1 , pp. 25–33, 2017, [Online]. Available: https://sid.ir/paper/268308/en

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