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Research on the Analysis Method of Fault Rupture Induced Response for Buried Pipelines Crossing the Reverse Fault

Author: CuiChengChen
Tutor: LiXiaoJun
School: China Seismological Bureau, Institute of Engineering Mechanics
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Reverse fault Buried pipelines Fault movement Failure Mode Earthquake Response
CLC: P315
Type: Master's thesis
Year: 2009
Downloads: 132
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Abstract

Fault movement directly caused by the venues or near the surface rupture is the main reason for the destruction of buried pipelines. The seismic response of buried pipeline across the fault is one of the important lifeline earthquake engineering research. Many scholars have this problem a lot of work, a lot of analysis methods. The traditional method of theoretical analysis and numerical simulation has been carried out mainly based on the strike-slip faults. The thrust fault on the complexity of the role of buried pipeline, the pipeline across thrust fault reaction has a certain degree of difficulty, this work is carried out less. Large deformation of the pipe-soil pipe sections based on existing work to establish the finite element model of the shell elements, the buried pipelines cross thrust fault fault dislocation reaction analysis has been some preliminary research results, can cross the inverse faults buried pipelines designed to provide reference. The main work includes: 1. Derivation of an equivalent compression spring the boundary shell element finite element analysis model to simplify and improve the calculation boundary approach. 2 of the pipe-soil deformation pipe section to establish the finite element analysis model of the shell elements, through nonlinear soil spring consider pipe interaction between the soil and the introduction of the connection tube node shell elements equivalent tension spring boundary and equivalent The compression springs boundaries to consider the distal segment of the small deformation tube, cross-thrust fault buried pipelines fault rupture reaction analysis. . Around the main factors that affect the pipeline across the fault reaction analysis of some examples, to investigate the failure mode of the pipeline in the reverse faulting action under, some preliminary conclusions: (1) through the angle of the cross-thrust fault buried the seismic response of pipelines is very small. In the same fault dislocation under different crossing angle of buried pipelines maximum axial compressive strain is very close. (2) small diameter pipelines and large diameter pipeline failure mode is very different. The destruction of the small diameter pipeline in the pipeline and at the intersection of the fault, and the need to analyze the long pipe sections in order to realize the stress and strain of the passive disk pipeline bending segment. With increasing diameter of the pipe casing behavior became clear, the failure of the pipe length also will be expanded. Synthesis of different diameter pipeline strain analysis and failure analysis of the length, in buried pipelines across the thrust fault, select a pipe diameter of 600mm ~ 1200mm more favorable to the earthquake. (3) the fault plane angle, the greater the inverse faults the more serious damage to buried pipelines. Same dislocation under fault plane inclination of the greater, the greater the strain of the pipe, the pipeline is very sensitive to the vertical uplift. (4) the greater the depth of the pipeline in the reverse faulting the more serious damage. Across the thrust fault buried pipelines the meet minimum overburden depth of the top of the pipe, the depth of soil freezing and anti-floating requirements premise, is shallow appropriate.

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