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Stiffening ring buried penstock Stability Analysis

Author: WangMingJiang
Tutor: LiNing；SunBaoPing；YangJingHui
School: Xi'an University of Technology
Course: Geotechnical Engineering
Keywords: Stiffening ring buried penstock Initial gap Joint bearing FEM Contact pair Critical external pressure Buckling
CLC: TV732.4
Type: Master's thesis
Year: 2005
Downloads: 159
Quote: 0
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Abstract

Penstock layout flexibility , you can use water pressure inside the rock share , save steel and high safety , reliable operation , and is widely used in large and medium hydropower stations. Implantable pressure pipeline design to solve the water pressure inside the liner and surrounding offloading external water pressure ratio and the liner stability problems. Including water pressure, the steel liner , concrete lining and rock may jointly carry . Theory and application flexibility thin cylinder radial deformation compatibility condition according to the analytical method , the plastic can not be considered rock , rock excavation after the initial stress and secondary stress on the pressure pipe under internal water pressure influence on the non-circular hole room was not suitable. Finite element analysis method to resolve the problems , the steel liner and the concrete lining to simulate different slight gap between the easy to achieve. This paper draws the advantages of the above two methods , combined with the actual buried pressure pipelines carrying the process , proposed a semi- analytical and semi finite element method . To further contrast , this paper proposes an alternative finite element method, through the steel liner and the concrete lining of the contact between the liner and the concrete lining cells on the initial gap between the value of quantitative analysis of the system can be well simulated when the initial gap value closed, lined , concrete lining and rock of the three co- bearing mechanism . When inside the vent pipe , groundwater as external pressure loads directly through the concrete cracks in the pipe wall , the wall structure can easily result in shell buckling . Our norms, the U.S. and Japan are recommended by Ming pipe Mises formula to calculate the critical external pressure , without considering the concrete lining of the steel pipe wall radial deformation binding effect , only the radial restraints such as safety reserves corresponding reduction in safety factor. But usually smaller initial gap , the radial constraint for concrete lining of the pressure tube will remain outside the critical pressure increase , and this phenomenon is the current design , not considered in the analysis . In order to consider concrete lining paper lined radial constraint on the role of application of large

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CLC: > Industrial Technology > Hydraulic Engineering > Hydropower utilization of hydropower project > Hydropower station construction and equipment > Hydro power station building > Pressure Piping
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