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A design method for a pipeline to pass through a reverse fault with a vibration peak value of more than 0.4g

A design method and technology of reverse faulting, applied in calculation, seismic signal processing, and 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: 2016-08-17
BC P INC CHINA NAT PETROLEUM CORP +2
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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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  • A design method for a pipeline to pass through a reverse fault with a vibration peak value of more than 0.4g
  • A design method for a pipeline to pass through a reverse fault with a vibration peak value of more than 0.4g
  • A design method for a pipeline to pass through a reverse fault with a vibration peak value of more than 0.4g

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Experimental program
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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 reverse faults with a vibration peak value 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; the 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 e...

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 a vibration peak value of more than 0.4 g, including: (1) selecting a reverse fault and a pipeline; (2) measuring the fault dip angle α of the reverse fault, and calculating the surface of the reverse fault respectively Vertical dislocation amount D CV and the surface level dislocation D CH ; (3) Select the intersection angle β between the pipeline and the fault according to H; (4) Use the formula ΔX=D CH cosβ calculates ΔX and uses the formula ΔY=D CH sinβ calculates ΔY; (5) use the formula Calculate ΔL c ; (6) Using the formula Calculate ΔL; (7) compare whether ΔL is less than or equal to ΔL c , yes, it is determined that the designed pipeline is suitable for installation in the reverse fault, otherwise, repeat steps (1), (5), (6) until ΔL is less than or equal to ΔL c . The invention has reasonable design method and reliable pipeline design, and can ensure that pipelines installed in reverse faults under different conditions have good seismic 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 Patents(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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