scholarly journals Experimental Study on Seismic Response of Buried Oil and Gas Pipeline Soil Layers under Lateral Multipoint Excitation

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jianbo Dai ◽  
Li Wang ◽  
Chengtao Hu ◽  
Guidi Zhang
Keyword(s):  
Seismic Response ◽  
Oil And Gas ◽  
Fourier Spectrum ◽  
Site Response ◽  
Time History ◽  
Shaking Table ◽  
Gas Pipelines ◽  
Loading Level ◽  
Oil And Gas Pipelines ◽  
Laminar Shear

The seismic response of buried oil and gas pipelines is mainly influenced by the site soil. In this paper, a bidirectional laminar shear continuum model box is developed for the site response of buried oil and gas pipelines under transverse multipoint seismic excitation. By comparing the acceleration response of the soil and pipeline, monitoring the soil displacement, and analyzing the acceleration coefficient and Fourier spectrum, the seismic response characteristics of the soil at different excitation modes and peak seismic acceleration and its laws were investigated. The test results show that the soil under transverse excitation undergoes the process of soil compaction to nonlinear characteristics and finally soil damage, and the course of multipoint excitation develops faster and causes more serious soil damage. The peak Fourier spectrum of both the pipe and the soil appears at the frequency of 4–6 Hz, and in general, the acceleration of the pipe is greater than that of the soil; the difference between the two gradually decreases with the increase of loading level. Compared with the uniform excitation, the increase in the loading level during the lateral multipoint excitation will result in a decrease of the consistency of the acceleration time history curve at each measurement point and a decrease of the peak of the spectrum. The effect of laminar shear between soil bodies becomes more obvious with the increase of acceleration peaks on the shaking table. It is also found out that the excitation method has little effect on the displacement time history curve, but the multipoint excitation may cause fluctuations in the displacement time history curve.

scholarly journals Shaking Table Test on the Seismic Response of Buried Oil and Gas Pipelines under the Bidirectional Nonuniform Seismic Excitation

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jianbo Dai ◽  
Chengtao Hu ◽  
Li Wang ◽  
Guidi Zhang
Keyword(s):  
Seismic Response ◽  
Oil And Gas ◽  
Axial Direction ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Acceleration Response ◽  
Peak Displacement ◽  
Loading Level ◽  
Oil And Gas Pipelines ◽  
Laminar Shear

This paper studies the seismic response of buried oil and gas pipelines under the bidirectional nonuniform excitation. Based on the bidirectional shaking table array test, the loading and testing scheme is designed and developed, analyzing the strain response of the buried oil and gas pipeline under the bidirectional uniform and nonuniform seismic excitation, as well as the acceleration response and displacement response characteristics of the pipeline and the surrounding soil body and their change rule by the test. The test proves to show that the developed bidirectional laminar shear continuum model soil box can meet the requirements of the bidirectional nonuniform seismic excitation and continuous laminar shear deformation of the soil. The peak strains of the pipeline in axial and bending caused by nonuniform excitation are larger than those of the pipeline under uniform excitation, the degree of unevenness in the distribution along the axial direction is greater, and the strain curves are large in the middle and small at both ends along the axial direction of the pipe. The acceleration responses of the pipeline and the soil body under the bidirectional nonuniform excitation are larger than those under the uniform excitation. The acceleration response of both the pipe and the soil under the nonuniform excitation is larger than that under the uniform excitation, and the differences are shown in the transverse and axial directions, the peak acceleration response of the soil body under the nonuniform excitation is about three times that of the transverse direction, and more peak points appear in the axial and transverse acceleration responses of the pipe under the nonuniform excitation as the loading level increases, the peak displacement response of the soil body increases gradually with the height, but the fluctuation range of the peak displacement of the soil body nearby the pipe is larger. The soil displacement curve starts to smooth out when the loading level reaches 1.0 g, and the axial displacement decreases, which indicates that the interaction between the pipe and soil is more intense and the relative motion between the pipe and soil is more obvious under the nonuniform excitation, and the soil is more likely to be damaged and enter the nonlinear stage. Therefore, it is necessary to analyze and design the seismic performance of buried pipes considering the nonuniform seismic excitation.

Improved Wear Resistance of the IGR Shutoff Valve in Oil and Gas Pipelines

2021 ◽  
Vol 41 (3) ◽  
pp. 206-210
Author(s):  
I. N. Karelin ◽  
V. D. Sedykh ◽  
L. V. Sedykh
Keyword(s):  
Wear Resistance ◽  
Oil And Gas ◽  
Gas Pipelines ◽  
Oil And Gas Pipelines
Sign in / Sign up

Export Citation Format

Share Document