Research On Cooperative Deformation Of Buried Pipeline And Soil In Coal Mining Subsidence Area And Safety Evaluation

At present,coal resources still occupies the main position of China’s energy consumption structure.For the sustainable development of economy and society,China has gradually begun to pay attention to the adjustment of energy structure and gradually increase the utilization of natural gas and other new energy sources.So it is accompanied by the increasing demand for natural gas,China’s pipeline construction has also entered a stage of rapid development.Pipeline is a linear project with extensive extension,which inevitably covers coal resources.Therefore,under the influence of coal mining subsidence,the safe operation of pipelines has become a common concern of the pipeline industry and the coal industry.This paper takes the buried gas pipeline along the Taibai Road in the 630 mining area of Shandong Tangkou Coal Mine as the research object,the ability to resist surface deformation is analyzed combined with the relevant specifications.A surface movement observation station along the pipeline and four drillings for monitoring the deformation of the soil around the pipeline are established.The surface movement along the pipeline during the mining period and the internal settlement data of the soil during the mining period are analyzed,and the surface deformation along the pipeline and the vertical deformation law of the soil are obtained.Based on ABAQUS finite element analysis software,taking the actual pipeline and field as the prototype,the numerical model of pipeline and soil is established by using master-slave interface.By applying different stages of soil deformation,the synergistic relationship between the pipeline and soil deformation and the influence of soil subsidence and axial horizontal movement on the deformation and stress of the pipeline are studied.It is found that the maximum axial stress of the pipeline is 84.2 MPA,which is much smaller than the yield strength of the pipeline 323 MPa,and the pipeline is still in a safe state under the current mining conditions.