Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g

A design method and technology of reverse faulting, applied in the direction of calculation, seismic signal processing, special data processing applications, etc., can solve problems such as large errors, different rupture angles of the surface rupture surface, different displacements in the rupture direction, and the consumption of manpower and material resources. To achieve the effect of closely linked links, good guiding significance, and smooth logic

Active Publication Date: 2014-02-19
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Since my country promulgated the "Code" and "Guidelines", my country's pipeline seismic design level has improved, but many new research results have not yet been included in the code. When moving, if the surface soil layer has a certain thickness, the rupture angle, rupture direction, and displacement of the surface rupture surface are different from those of the bedrock.
This result shows that the site conditions not only affect the seismic response spectrum, but also affect the surface rupture surface and displacement amplitude. There are huge differences in the seismic design methods of pipelines due to the different ground rupture surfaces.
[0004] In addition, for high-intensity areas with a vibration peak value above 0.4g, the only way at present is to use the Newmark-Hall method and the finite element numerical simulation analysis method to analyze the strain of the pipeline, and then put forward feasible suggestions, but the results of the recommendations and analysis The deviation from the actual test situation is large, not only cannot provide an effective seismic design method for pipelines, but also easily lead to waste of cost, and consume a lot of manpower and material resources

Method used

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  • Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g
  • Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g
  • Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g

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Experimental program
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Effect test

Embodiment

[0037] The present invention is mainly applied to how to design and install suitable pipelines when the active fault type is a reverse fault, so that the pipeline in the reverse fault has good anti-seismic performance. The present invention is especially designed for a reverse fault whose vibration peak value is above 0.4g, and the design process includes the following steps:

[0038] (1) Select the reverse fault, and arbitrarily select the pipeline to be installed in the reverse fault, and measure and record the parameters of the pipeline at the same time, the parameters include the pipe density ρ m , pipe diameter d, wall thickness δ and elastic modulus E; parameters in this step can be measured by existing technical means;

[0039] (2) Measure the fault dip angle α of the reverse fault, and calculate the surface vertical dislocation D of the reverse fault respectively CV and surface level dislocation D CH ; The fault dip angle α in this step is also obtained by using the ex...

example 1

[0058] For the reverse fault in the test, the covering soil layer thickness H is 0m (that is, the bedrock), the Richter magnitude M is simulated as 7.0, and the soil quality is clay.

[0059] The basic parameters of the reverse fault are shown in Table 2:

[0060]

[0061] Table 2

[0062] (1) Calculate the surface vertical dislocation D of the reverse fault CV :lnD CV =0.926×7.0-0.028×0+1.305×sin60°-7.192=0.42m, calculated as D CV =1.522m; calculate the surface horizontal dislocation D of the reverse fault CH :lnD CH =0.926×7.0-0.085×0-0.861×sin60°-5.573=0.163m, calculated as D CH =1.177m;

[0063] (2) The intersection angle β between the design pipeline and the fault is 30°, then the fault displacement parallel to the axis of the pipeline ΔX=D CH cosβ=1.177×cos30°=1.019m, the fault displacement ΔY=D in the normal direction of the pipeline CH sinβ=1.177×sin30°=0.589m;

[0064] (3) Calculation of the critical compressive stress σ when the pipeline is destabilized b...

example 2

[0077] The above parameters are still used, and the difference from Example 1 is that in this example, the covering soil layer thickness H is 15m, the Richter magnitude M is simulated as 7.2, and the reduction factor η is 4, then:

[0078](1) Calculate the surface vertical dislocation D of the reverse fault CV :lnD CV =0.926×7.2-0.028×15+1.305×sin60°-7.192=0.185m, calculated as D CV =1.203m; Calculate the surface horizontal dislocation D of the reverse fault CH :lnD CH =0.926×7.2-0.085×15-0.861×sin60°-5.573=-0.926m, calculated as D CH =0.396m;

[0079] (2) Fault displacement parallel to the pipeline axis ΔX=D CH cosβ=0.396×cos30°=0.343m, the fault displacement ΔY=D in the normal direction of the pipeline CH sinβ=0.396×sin30°=0.198m;

[0080] (3) Calculation of the critical compressive stress σ when the pipeline is destabilized by compression c =555×10 6 pa;

[0081] (4) Calculate the friction force f per unit length of the pipeline s =6.169×10 4 N / m;

[0082] (5) ...

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Abstract

The invention discloses a design method for a pipeline passing through a reverse fault with the vibration peak value being more than 0.4g. The design method comprises the steps that (1) the reverse fault and the pipeline are selected; (2) the fault dip angle alpha of the reverse fault is measured, and the surface vertical displacement D<CV> and the surface horizontal displacement D<CH> of the reverse fault are calculated respectively; (3) according to H, the intersection angle beta of the pipeline and the reverse fault is selected; (4) delta X is calculated by means of the equation that delta X=D<CH>*cos beta, and delta Y is calculated by means of the equation that delta Y=D<CH>*sin beta; (5) delta L<c> is calculated by means of the equation that ; (6) delta L is calculated by means of the equation that ; (7) whether delta L is less than or equal to delta L<c> is judged, it is determined that the designed pipeline is suitable for being installed in the revere fault if delta L is less than or equal to delta L<c>, and if delta L is greater than delta L<c>, the step (1), the step (5) and the step (6) are repeated until the delta L is less than or equal to delta L<c>. The design method is reasonable, achieves reliable pipeline design, and can guarantee that pipelines installed in reverse faults with different conditions all have good shock resistance.

Description

technical field [0001] The invention relates to a method for designing a pipeline, in particular to a method for designing a pipeline passing through a reverse fault whose vibration peak value is above 0.4g. Background technique [0002] In the survey and design process of natural gas pipeline projects, there are many projects where pipelines pass through high-intensity earthquake fault zones. It is the pipeline failure caused by large deformation, and the failure of the pipeline passing through the fault zone is a typical example of large deformation failure. How to avoid pipeline damage has always been a research topic for engineering designers. [0003] Since my country promulgated the "Code" and "Guidelines", my country's pipeline seismic design level has improved, but many new research results have not yet been included in the code. When moving, if the surface soil layer has a certain thickness, the rupture angle, rupture direction, and displacement of the surface rupt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01V1/28
Inventor 李强牟建李岳
Owner BC P INC CHINA NAT PETROLEUM CORP
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