Monitoring of NATM Tunnels: A Micromechanics and Shell Theory based Approach for Analysis of Shotcrete Tunnel Linings

 
9783659258794: Monitoring of NATM Tunnels: A Micromechanics and Shell Theory based Approach for Analysis of Shotcrete Tunnel Linings
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Point-wise 3D displacement measurements over time are a key input for monitoring shotcrete shells during construction according to the New Austrian Tunneling Method. This book is a state-of-the-art contribution to tunnel monitoring. We use displacement measurements to construct their field histories, by two diverse interpolation strategies: one in a fixed Cartesian base frame and the other in a moving cylindrical base frame. Thin shell kinematics and a micro-viscoelasticity model for hydrating shotcrete allow for estimation of strain and stress field histories. Thereby, the moving base frame interpolation gives more realistic estimate of the actual load carrying behavior of a tunnel. We study the influence of shotcrete composition on the estimation of shell stresses: a realistic estimate of stresses require a more accurate shotcrete composition, while the estimate of utilization degree is too robust to be affected by the shotcrete composition. A solution of partial differential equations for equilibrium in cylindrical coordinates reveals that, for a tunnel in clayey ground at moderate depth, the maximum shear tractions at the ground-shell interface may even exceed the normal ones.

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Doctorate in Tunnel Engineering Mechanics from Vienna University of Technology, Austria. Principal Engineer at Directorate of Civil Engineering and Design, Pakistan

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Ullah, Shafi
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Book Description Condition: New. Publisher/Verlag: LAP Lambert Academic Publishing | A Micromechanics and Shell Theory based Approach for Analysis of Shotcrete Tunnel Linings | Point-wise 3D displacement measurements over time are a key input for monitoring shotcrete shells during construction according to the New Austrian Tunneling Method. This book is a state-of-the-art contribution to tunnel monitoring. We use displacement measurements to construct their field histories, by two diverse interpolation strategies: one in a fixed Cartesian base frame and the other in a moving cylindrical base frame. Thin shell kinematics and a micro-viscoelasticity model for hydrating shotcrete allow for estimation of strain and stress field histories. Thereby, the moving base frame interpolation gives more realistic estimate of the actual load carrying behavior of a tunnel. We study the influence of shotcrete composition on the estimation of shell stresses: a realistic estimate of stresses require a more accurate shotcrete composition, while the estimate of utilization degree is too robust to be affected by the shotcrete composition. A solution of partial differential equations for equilibrium in cylindrical coordinates reveals that, for a tunnel in clayey ground at moderate depth, the maximum shear tractions at the ground-shell interface may even exceed the normal ones. | Format: Paperback | Language/Sprache: english | 160 pp. Seller Inventory # K9783659258794

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Shafi Ullah
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Book Description LAP Lambert Academic Publishing Okt 2012, 2012. Taschenbuch. Condition: Neu. Neuware - Point-wise 3D displacement measurements over time are a key input for monitoring shotcrete shells during construction according to the New Austrian Tunneling Method. This book is a state-of-the-art contribution to tunnel monitoring. We use displacement measurements to construct their field histories, by two diverse interpolation strategies: one in a fixed Cartesian base frame and the other in a moving cylindrical base frame. Thin shell kinematics and a micro-viscoelasticity model for hydrating shotcrete allow for estimation of strain and stress field histories. Thereby, the moving base frame interpolation gives more realistic estimate of the actual load carrying behavior of a tunnel. We study the influence of shotcrete composition on the estimation of shell stresses: a realistic estimate of stresses require a more accurate shotcrete composition, while the estimate of utilization degree is too robust to be affected by the shotcrete composition. A solution of partial differential equations for equilibrium in cylindrical coordinates reveals that, for a tunnel in clayey ground at moderate depth, the maximum shear tractions at the ground-shell interface may even exceed the normal ones. 160 pp. Englisch. Seller Inventory # 9783659258794

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Shafi Ullah
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Book Description LAP Lambert Academic Publishing Okt 2012, 2012. Taschenbuch. Condition: Neu. Neuware - Point-wise 3D displacement measurements over time are a key input for monitoring shotcrete shells during construction according to the New Austrian Tunneling Method. This book is a state-of-the-art contribution to tunnel monitoring. We use displacement measurements to construct their field histories, by two diverse interpolation strategies: one in a fixed Cartesian base frame and the other in a moving cylindrical base frame. Thin shell kinematics and a micro-viscoelasticity model for hydrating shotcrete allow for estimation of strain and stress field histories. Thereby, the moving base frame interpolation gives more realistic estimate of the actual load carrying behavior of a tunnel. We study the influence of shotcrete composition on the estimation of shell stresses: a realistic estimate of stresses require a more accurate shotcrete composition, while the estimate of utilization degree is too robust to be affected by the shotcrete composition. A solution of partial differential equations for equilibrium in cylindrical coordinates reveals that, for a tunnel in clayey ground at moderate depth, the maximum shear tractions at the ground-shell interface may even exceed the normal ones. 160 pp. Englisch. Seller Inventory # 9783659258794

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Shafi Ullah
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Book Description LAP Lambert Academic Publishing, 2012. Paperback. Condition: New. Language: English . Brand New Book. Point-wise 3D displacement measurements over time are a key input for monitoring shotcrete shells during construction according to the New Austrian Tunneling Method. This book is a state-of-the-art contribution to tunnel monitoring. We use displacement measurements to construct their field histories, by two diverse interpolation strategies: one in a fixed Cartesian base frame and the other in a moving cylindrical base frame. Thin shell kinematics and a micro-viscoelasticity model for hydrating shotcrete allow for estimation of strain and stress field histories. Thereby, the moving base frame interpolation gives more realistic estimate of the actual load carrying behavior of a tunnel. We study the influence of shotcrete composition on the estimation of shell stresses: a realistic estimate of stresses require a more accurate shotcrete composition, while the estimate of utilization degree is too robust to be affected by the shotcrete composition. A solution of partial differential equations for equilibrium in cylindrical coordinates reveals that, for a tunnel in clayey ground at moderate depth, the maximum shear tractions at the ground-shell interface may even exceed the normal ones. Seller Inventory # KNV9783659258794

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