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Study on Safety of Submarine Hydraulic Tunnel Resistant to Earthquake Loading

Author: LiuZhiYong
Tutor: ZhengYongLai
School: Tongji University
Course: Port Coastal and Offshore Engineering
Keywords: Hydraulic Tunnel Seabed Liquefaction Seismic analysis Finite Difference Method
CLC: U459.5
Type: Master's thesis
Year: 2008
Downloads: 267
Quote: 1
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Abstract


Shield tunnel has been widely used in many of our construction field, such as power plant into the drainage tunnel, the urban subway tunnel, the damage, however, show that: Once the tunnel destroyed in the earthquake, the loss will be caused very heavy. China is earthquake country, it is necessary to conduct in-depth study of the hydraulic tunnel seismic. This paper close connection with the subject \layer liquefaction potential, and tunnel lining structure seismic internal force response was calculated and analyzed. The main contents of this paper include: an indoor soil test engineering site ⑤ 2 No. sandy silt soil physical indicators and mechanical indicators. The test mainly include: (1) dynamic triaxial test. Through vibration triaxial liquefaction test stress., These three indicators of strain and pore water pressure variation, and Ascertaining saturated sandy silt original state kind liquefaction strength under dynamic stress in the simulated earthquake; (2) resonant column test. Measured by resonant column test seeking dynamic shear modulus and damping ratio with shear strain changes in the relationship. The above test results can be further used for the calculation and analysis of structural seismic response and soil liquefaction. 2, respectively, using the standard penetration law Seed simplified method and dynamic analysis of finite difference method to distinguish the site soil liquefaction characteristics. Martin excess pore water pressure in the growth mode, for the introduction of the concept of anti-liquefaction safety factor F l and the earthquake process to select a representative of the four different locations along the pipeline axial possible liquefaction strata The cross section of the finite-difference dynamic analysis, two indicators than r u and excess pore water pressure from the anti-liquefaction safety factor F l discriminant liquefied. Liquefaction results and the three methods were compared and analyzed. The equivalent nonlinear finite-difference dynamic time history analysis method to study the seismic internal forces of the underground pipeline response characteristics. Mainly consider the interaction of static and seismic loading conditions under axial force, shear and bending moment of the lining structure the size of the internal forces and changes, to find out the location of the maximum internal force, seismic design load parameters, explore round earthquake-shaped cross-section of underground structures in response to the internal force distribution and variation.

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CLC: > Transportation > Road transport > Tunnel project > A variety of tunnel > Underwater tunnel
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