Method for measuring friction coefficient of pipe-soil contact interface

Abstract

The invention discloses a method for measuring the friction coefficient of a pipe-soil contact interface, which comprises the steps of putting a pipeline material plate into a pipe container, and putting a soil sample container on the pipeline material plate; keeping the soil sample container static, pulling the pipe container to enable the pipe container to generate displacement, and recording the tensile force reading of the pipe container as Fsf; putting a soil sample into the soil sample container, applying pressure N towards the pipeline material plate to the soil sample, keeping the soil sample container static, pulling the pipe container to enable the pipe container to generate displacement, and recording the tensile force reading of the pipe container as Fall; and repeating the steps S20-S30 for n times, calculating the friction coefficient mu from the first time to the nth time, and finally obtaining a friction coefficient measurement result, that is, by driving the relative movement of the soil sample container and the pipe container, enabling the soil sample to be in contact with the pipe container and recording the tensile force borne by the pipe container through the tensile force sensor, and then calculating the friction coefficient between contact interfaces when the pipe soil has relatively large displacement. The method is good in simulation effect and more accurate in measurement result.

Description

Technical field [0001] The present invention relates to a method for friction coefficient of tube contact interface in the field of civil engineering test technology. Background technique [0002] The pipeline is an important means of oil and gas transportation. For land embedded pipes, it is susceptible to the influence of the ground soil layer when crossing the geological disaster area, resulting in an additional load acting on the pipeline; for subsea pipes, high temperature and high pressure The oil and gas will cause huge axial stress in the pipeline to produce a flexible, and the force acting on the pipes around the pipe is an important factor in maintaining the stability of the pipeline. Therefore, during the design construction and operation of pipeline engineering, the coefficient of friction between the pipeline and the surrounding soil contact surface is an indispensable parameter. [0003] At present, the friction coefficient of the pipeline interface is generally val...

AI Technical Summary

Problems solved by technology

With the diversification of pipeline materials, the lack of measuring devices and methods for the friction coefficient of the pipe-soil interface leads to the inability to guarantee the safety and economy of pipeline design

Due to the small size of the existing direct shear test, the working condition of relatively large relative displacement of the pipe and soil cannot be simulated in the test. At the same time, the normal stress on the shallow buried pipe is small, so the measured shear force value is small. In the data System friction during processing cannot be ignored

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