3-D stability analysis and design of the primary support of Karaj metro Tunnel: Based on convergence data and back analysis algorithm

Dehghan, Ali Naghi; Shafiee, Seyed Mohsen; Rezaei, F

doi:10.1016/j.enggeo.2012.05.008

Cited by 24 publications

(3 citation statements)

References 8 publications

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“…However, this method did not thoroughly analyze the stress characteristics of the support structures. Dehghan et al [12] proposed an economic and time-saving univariate back-analysis method based on convergence data; however, the gained parameters were higher than those in the soil mechanical test. Zhang et al [13] discussed the recognition of linear elastic transverse isotropy rock parameters, the optimized layout of measuring points, and the optimization algorithm by analytic method; this analytical method was only applicable to round tunnels.…”

Section: State Of the Artmentioning

confidence: 99%

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

He¹,

Linsheng²,

Wang³

2019

JESTR

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The internal forces of primary support obtained by theoretical analysis and numerical simulation often differ significantly from actual data due to the uncertainty of parameters of the surrounding rock and the field construction conditions in tunnels. This study proposed a novel back-analysis method to accurately evaluate the internal forces of the primary support on the basis of radial displacement and contact stress. According to the geometric characteristics and mechanical properties of the primary support in deep tunnels, a mechanical model was established based on theory of circular curved beam. The analytical solutions of these internal forces were then deduced. A case study was conducted to analyze the internal forces of the primary support obtained using the proposed method. Results demonstrate that the internal forces of the primary support of symmetrically loaded tunnels can be directly evaluated by radial displacement and contact stress. The peak-values of internal forces appear in vault, arch springing and the section with a θ angle of 60°. This study provides reference for the dynamic design and optimization of construction for the primary support in tunnels.

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Section: State Of the Artmentioning

confidence: 99%

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

He¹,

Linsheng²,

Wang³

2019

JESTR

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“…Khamsei et al presented a new intelligent inverse analysis technique combining fuzzy systems, an imperialistic competitive algorithm, and numerical analysis for the back analysis of the Karaj Subway in Iran [21]. Dehghan et al determined the geotechnical parameters using inverse analysis based on convergence data [22]. They also proved that their proposed method would be a more economical and time-saving technique in comparison to a design based on soil mechanic tests carried out by consultant engineers.…”

Section: Introductionmentioning

confidence: 99%

Structural Health Monitoring of 2D Plane Structures

Mobaraki

Galant

et al. 2021

Applied Sciences

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This paper presents the application of the observability technique for the structural system identification of 2D models. Unlike previous applications of this method, unknown variables appear both in the numerator and the denominator of the stiffness matrix system, making the problem non-linear and impossible to solve. To fill this gap, new changes in variables are proposed to linearize the system of equations. In addition, to illustrate the application of the proposed procedure into the observability method, a detailed mathematical analysis is presented. Finally, to validate the applicability of the method, the mechanical properties of a state-of-the-art plate are numerically determined.

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“…Due to these advantages, back-analysis of measured displacements has become a popular technique in many areas. It can be basically divided into two categories: inverse and direct approaches (Zou and Kaiser 1990, Zou 1995, Feng et al 2000, Deng and Lee 2001, Shang et al 2002, Zhang et al 2006b, Ghorbani and Sharifzadeh 2009, Deng et al 2010, Dehghan et al 2012, Moreira et al 2013. For the inverse approach, mathematical formulation is just the reverse of ordinary stress analysis.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Stress Estimation by Back Analysis Based on Wellbore Deformation with Consideration of Pore Pressure

Lin

Zou

2016

IJGE

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In oil and gas industry, wellbore stability control is paramount in an operation. It is essential to have information of the in situ stresses in well planning and prevention of wellbore failure. However, the current available measurement methods for in situ stresses in petroleum engineering are costly and often give scattering results. In this paper, a more practical displacement-based back analysis technique is proposed to determine the magnitude and orientation of the in situ stresses. The purpose is to provide an alternative tool for small operators in petroleum industry. An analytical solution is derived from displacement-stress relationship around a well in an isotropic rock with consideration of pore pressure. This method can be applied to calculate the displacement at any point around the well induced by drilling. In a reversed order, it can be used to calculate the in situ stresses from measured displacements at a number of locations on the borehole wall. For practical purpose, drained and undrained constitutive 2D models using measured diametrical deformation at different locations around a borehole wall as the input data have been developed to estimate the in situ stresses. Program codes in Matlab were written to facilitate the analysis under different conditions. An example is introduced to test the model and the program. The results validated this back-analysis approach and made a reliable estimation of the in situ stresses. The effects of pore pressure are also evaluated and are found to have significant impact on the shape of wellbore deformation. This impact differs for the drained and undrained conditions.

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3-D stability analysis and design of the primary support of Karaj metro Tunnel: Based on convergence data and back analysis algorithm

Cited by 24 publications

References 8 publications

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

Structural Health Monitoring of 2D Plane Structures

In-Situ Stress Estimation by Back Analysis Based on Wellbore Deformation with Consideration of Pore Pressure

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