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In-situ pipe-soil test system and method on the basis of hydraulic suction cylinder

A test system and a technology of pipe-soil interaction, applied in the field of marine engineering, can solve the problems of small probes, unable to provide soil binding force for submarine pipelines, difficult to accurately measure undisturbed soil, etc., to achieve the effect of avoiding test errors

Pending Publication Date: 2019-04-02
TIANJIN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Traditional seabed soil properties measurement methods include indoor tests after drilling samples and in-situ CPT tests. The former is difficult to accurately measure the properties of undisturbed soil due to factors such as unloading, extrusion and human disturbance during the sampling pro

Method used

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  • In-situ pipe-soil test system and method on the basis of hydraulic suction cylinder
  • In-situ pipe-soil test system and method on the basis of hydraulic suction cylinder
  • In-situ pipe-soil test system and method on the basis of hydraulic suction cylinder

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0034] As shown in the figure, an in-situ pipe-soil action test system with a hydraulic suction cylinder foundation, including a frame structure, a mechanical loading mechanism and a test pipe section,

[0035] Among them, the frame structure is composed of the upper plate 13, the middle frame 11, the lower pier 12 and the hydraulic suction cylinder 1, the upper plate and the middle frame, the middle frame and the lower pier are connected by steel pipes, and the hydraulic suction cylinders are respectively arranged in two below the lower pier;

[0036] Wherein, the mechanical loading mechanism includes a top guide rail 10, a bottom guide rail 2, a vertical loading hydraulic cylinder 9, a force transmission plate 6, a lead screw 5 and a servo motor 7, the top guide rail is arranged under the middle shelf, and the bottom guide rail is arranged Be...

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Abstract

The invention discloses a novel in-situ pipe-soil test system and method, which have greatly improvement compared with the traditional indoor pipe-soil test method. The invention directly intercepts one segment of a prototype pipeline for in-situ testing to maximumlly restore the actual working environment of the subsea pipeline, and realizes the requirement of stable loading on the irregular seabed surface by means of the mode of hydraulic suction cylinder combined operation; through different loading modes in the vertical and horizontal loading systems, physical quantities such as the vertical penetration resistance, the depth of self-sinking, the horizontal resistance, and the bearing capacity envelope at different depths are measured, and the tensile pressure, torque and pore pressuresignals are collected by the sensor during the test. The values measured by the invention can be directly used for the design and stability assessment of the submarine pipeline in the sea, and can also be used to evaluate the properties of the soil on the surface of the seabed.

Description

technical field [0001] The invention relates to a method for measuring the properties of seabed surface soil for submarine pipelines, in particular to an in-situ pipe-soil action test system with a hydraulic suction cylinder foundation and a test method thereof, belonging to the field of marine engineering. Background technique [0002] As the exploration and development of offshore oil and gas resources gradually develop into the deep sea, submarine pipelines, as an important way of oil and gas transportation, are increasing year by year in the length of their laying, the width of the covered sea area, and the frequency of crossing complex landforms. In the deep sea environment, the seabed surface can reach 1500 meters or even deeper. At this time, the commonly used trenching and backfilling methods in shallow seas will increase the difficulty of construction and increase the cost. Therefore, in deep seas, it is often used "S" type or "J" type and other straight laying tech...

Claims

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Application Information

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IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 王宇飞刘润王乐韩德卿
Owner TIANJIN UNIV
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