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Design Methodology to Evaluate Hydraulic Jacking in Pressure Tunnels
This paper presents methodology and tools for use in evaluation of potential hydraulic jacking in the concrete-lined section of a pressurized headrace tunnel immediately adjacent to a steel-lined tunnel section. The locations of potential in situ stress deficiency in the rock mass are uncertain but could be located in the transition section. Therefore, the performance of reinforced concrete-lining in the transition zone and elsewhere are evaluated for hydraulic jacking. The evaluation of hydraulic jacking was performed by using finite element method (FEM) and discrete element method (DEM). The computer programs ABAQUS and UDEC were used for FEM and DEM analyses, respectively. In addition to the analytical approach, a review of the available approaches focusing on the performance of concrete-lined pressure tunnels was performed. The response of the tunnel system including the lining and surrounding rock mass was evaluated for various scenarios. The evaluation includes: (1) extent of hydrojacking; (2) exfiltration from the tunnels; and (3) structural stability of the tunnel system. A series of sensitivity analyses were performed using numerical modeling to parametrically evaluate the influence of rock mass joint variations on the results.
Design Methodology to Evaluate Hydraulic Jacking in Pressure Tunnels
This paper presents methodology and tools for use in evaluation of potential hydraulic jacking in the concrete-lined section of a pressurized headrace tunnel immediately adjacent to a steel-lined tunnel section. The locations of potential in situ stress deficiency in the rock mass are uncertain but could be located in the transition section. Therefore, the performance of reinforced concrete-lining in the transition zone and elsewhere are evaluated for hydraulic jacking. The evaluation of hydraulic jacking was performed by using finite element method (FEM) and discrete element method (DEM). The computer programs ABAQUS and UDEC were used for FEM and DEM analyses, respectively. In addition to the analytical approach, a review of the available approaches focusing on the performance of concrete-lined pressure tunnels was performed. The response of the tunnel system including the lining and surrounding rock mass was evaluated for various scenarios. The evaluation includes: (1) extent of hydrojacking; (2) exfiltration from the tunnels; and (3) structural stability of the tunnel system. A series of sensitivity analyses were performed using numerical modeling to parametrically evaluate the influence of rock mass joint variations on the results.
Design Methodology to Evaluate Hydraulic Jacking in Pressure Tunnels
Moridzadeh, Mohammad (author) / Dickson, Peter (author)
IFCEE 2018 ; 2018 ; Orlando, Florida
IFCEE 2018 ; 201-213
2018-06-06
Conference paper
Electronic Resource
English
Design Methodology to Evaluate Hydraulic Jacking in Pressure Tunnels
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