Safety analysis of buried gas pipelines in seasonal frozen soil areas under fault action
The safety of buried gas pipelines in seasonal frozen soil areas under the action of faults is affected by many factors.To investigate the effects of natural gas temperature,pipeline burial depth,internal pressure,and pipe wall thickness on pipeline safety,a nonlinear mutual contact model of pipe and soil is established by means of the finite element software ABAQUS to simulate fault dislocation.The analysis shows that within the scope of the research data range,the maximum stress of the buried gas pipeline under the action of the fault occurs near the fault;although the pipelines on both sides of the fault have stress concentration,the distribution range and peak value of the stress concentration on both sides are different.Increasing the temperature of the natural gas in the pipeline can reduce stress in the buried gas pipeline caused by the fault dislocation and can decrease potential damage to the buried gas pipeline.Shallow burying of pipelines can reduce the stress of buried gas pipeline under the action of the fault,which can reduce the possibility of damage to the buried gas pipeline;higher internal pressures of the buried gas pipeline lead to faster increases in pipeline stress with the fault dislocation,raising potential damage risk;thicker walls of the buried gas pipeline result in slower growth rates for pipeline stress during the fault dislocation with reduced likelihoods for failure.
finite elementfaultburied gas pipelineseasonal frozen soil area
NETL
NSTL
万方数据
维普
