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Risk assessment method for collapsible loess based on multi-angle laying of simulated pipelines

A collapsible loess and dangerous technology, applied in the field of pipeline embedding in collapsible loess areas, can solve problems such as difficulty, high cost, and long test period

Active Publication Date: 2020-02-04
CHINA PETROCHEMICAL CORP +3
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The size effect of the model test affects the test effect, and the cost of the model test and in-situ test is relatively high, the test period is long, the difficulty is high, and it is easily disturbed by various unpredictable factors

Method used

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  • Risk assessment method for collapsible loess based on multi-angle laying of simulated pipelines
  • Risk assessment method for collapsible loess based on multi-angle laying of simulated pipelines
  • Risk assessment method for collapsible loess based on multi-angle laying of simulated pipelines

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Experimental program
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specific Embodiment

[0084] (1) The ratio of experimental materials and the establishment of different angle models; according to the slope model during the indoor test, use FLAC3D to establish the model;

[0085] According to the test requirements, select and prepare the test materials suitable for the experiment, and make the main material of the model according to the ratio; according to the pipe embedding angle, design the size and angle of the model, make the main model; the pipe embedding is excavated according to the geometric similarity ratio, The burial angles are respectively 15°, 30°, 45°, and 60°, and the top and bottom of the pipeline should be exposed to the soil when burying. It mainly simulates and calculates the force analysis of the pipeline and the upper soil after the soil around the pipeline in the soil slope encounters water and soil loss. Four angles were compared in this simulation, namely 30°, 40°, 50°, and 60°. The specific implementation steps are as follows:

[0086] ...

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Abstract

The invention discloses a risk assessment method for collapsible loess based on simulation of pipeline multi-angle laying. The risk assessment method comprises the following basic steps: analog simulation: proportioning experimental materials and establishing different-angle models; simulating the working conditions of running water scouring to different-angle laying; analyzing damage conditionsof soil bodies around pipelines with different laying angles; determining the relationship between the angles and the soil body damage according to soil body cracks, displacement and the quantity of quicksand; establishing a relation curve routing plan between the laying angles of the pipelines and destruction loss of the soil bodies around the pipelines; numerical simulation: establishing a modelby using FLAC3D according to a slope constructing model during a laboratory test; establishing different-angle laying models and plastic state diagrams; establishing vertical displacement contour maps of different-angle soil slopes; establishing transverse displacement contour maps of the different-angle soil slopes; establishing displacement vector maps of the different-angle soil slopes; determining a destruction law of the pipelines by combining the plastic state diagrams and the displacement of the pipelines. According to the risk assessment method disclosed by the invention, the occurrence of substantial destruction of the soil bodies around the pipelines is avoided, and safe operation of oil and gas pipelines and the like is ensured.

Description

technical field [0001] The invention relates to the field of pipeline embedding in collapsible loess areas, in particular to a method for assessing the risk of collapsible loess based on simulating multi-angle laying of pipelines. Background technique [0002] Loess is a typical water-sensitive geological body. Water infiltration leads to loess subsidence, and a significant decrease in mechanical strength is an important factor for the suspension of oil and gas pipelines. During the burial of oil and gas pipelines, unconventional terrain such as steep slopes and ravines will be encountered, especially in loess areas. Minimal is what this experiment aims for. [0003] In some scientific research, it is sometimes impossible to directly control or intervene on the research object. In order to obtain the understanding of the research object, the model of the research object can be made through the simulation method, and then indirectly studied through experiments on the model. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 荆少东徐帅陵张鑫孙如华马学东王思宇侯方钟储汉程克强魏路先刘晓忠崔若晖傅玉张军伟韩东海
Owner CHINA PETROCHEMICAL CORP
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