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Method for determining pipeline critical burial depth in debris flow areas

A determination method, debris flow technology, applied in the direction of pipeline laying and maintenance, pipes/pipe joints/fittings, mechanical equipment, etc., can solve the problems of lack of science and objectivity, and weak ability to resist risks and disasters

Active Publication Date: 2015-02-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such buried pipeline methods and technologies lack scientificity and objectivity, and their ability to resist risks and disasters is very weak

Method used

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  • Method for determining pipeline critical burial depth in debris flow areas
  • Method for determining pipeline critical burial depth in debris flow areas
  • Method for determining pipeline critical burial depth in debris flow areas

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Embodiment Construction

[0064] A method for determining the critical buried depth of pipelines in debris flow areas, including the following steps:

[0065] Step 1. Determine the basic type of debris flow:

[0066] According to the local hydrometeorological data and the survey guide for the debris flow area, the type of a large-scale debris flow in a certain debris flow ditch can be obtained:

[0067] (1) If the clay content in the soil V 3 (The mud flow is 1200-1500kg / m 3 ); There is turbulent movement without obvious turbulence; the accumulation is obviously sorted, and the soil particles are larger than the original soil where the debris flow occurred; it is determined to be a thin debris flow;

[0068] (2) If the clay content in the soil> 3%, mud and rock fluid viscosity> 0.3Pa·s, the volume concentration of soil in the debris flow C V > 50%, the bulk density of mud and rock fluid> 1800kg / m 3 (Mud flow> 1500kg / m 3 ); Shows overall laminar flow with turbulence; there are undisturbed soil blocks in the flui...

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Abstract

The invention discloses a method for determining pipeline critical burial depth in debris flow areas. The method includes: for diluted debris flow, determining a forming initial flow velocity and a damaging initial flow velocity of an overlying soil armoring layer according to mutual effect between the diluted debris flow and pipeline overlying soil and critical hydraulic conditions of armoring layer forming and damaging, judging erosion modes of overlying soil according to scale and a flow velocity of the current debris flow, and calculating erosion depth of the pipeline overlying soil under the effect of the diluted debris flow; for viscose debris flow, judging erosion and deposition features of the debris flow according to relations between bed surface gradient and minimum slope required by debris flow movement, and calculating erosion depth, under erosion action, of the viscose debris flow if the bed surface gradient is larger than the minimum slope. The method has the advantages that erosion depth of the pipeline overlying soil under debris flows of different intensities is considered quantitatively, and technical guarantee is provided for scientific design and construction.

Description

Technical field [0001] The invention relates to a method for determining the critical buried depth of an oil and gas pipeline in a debris flow area. Background technique [0002] In mountainous areas, due to the complex terrain and geological conditions in mountainous areas, under the influence of external conditions, mountainous geological disasters (such as mudslides) occur frequently, and long-distance oil and natural gas pipelines need to pass through a large number of these areas, which is bound to be The passage of steam pipelines poses a major threat. [0003] At this stage, due to people's insufficient understanding of the special geological phenomenon of debris flow and the lack of corresponding engineering disaster mitigation technology, most pipeline projects can only be designed and constructed by relying on empirical judgments in the actual crossing process. Among them, the most important parameter related to pipeline safety-burying depth is generally determined in ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L1/028
Inventor 杨汗青李强张军李沫辜旋兰宇剑张俊徐嘉爽高兆鹏程圆晶周翔宇唐闻宋代诗雨邱湖淼
Owner BC P INC CHINA NAT PETROLEUM CORP
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