Landslide-pipeline Mechanical Response And Early Warning Study

Oil and gas pipelines in mountainous areas are often damaged by landslide disasters,causing major economic and property losses,and how to make a rapid evaluation and early warning of the safety status of landslide-pipeline disasters is one of the hot spots and difficulties in the field of landslide research.Based on mastering the relationship between the development al-sliding characteristics of the landslide and the deformation of the pipeline in the Sichuan-to-East Gas Transmission Puguang-YIchang section,this paper carries out the study of the law of landslide-pipeline deformation destruction,establishes the critical criterion of pipeline damage,and provides a theoretical basis for the safety assessment,monitoring arrangement and early warning of the pipeline.The following conclusions were reached:(1)The study area is located in southwest China,at the junction of the northeast edge of the Sichuan Basin and the mountainous areas of Oxi.The landscape is mainly mountainous,with an average elevation of 800 to 1600 m,with diverse formations,folds and fractures developing,and human engineering activities have a strong influence,with pipeline routes parallel,crossed and crossed in parallel with major linear projects.These factors provide good development conditions for the formation and development of geological disasters in the study area.(2)The landslide-pipeline distribution characteristics of the study area are as follows: from June to August each year is a high incidence period of landslides,accounting for about 80% of the total number of disasters;82.98% of landslides occur in mountainous areas;51% of landslides occur at an altitude of 400-800m;74.47 % Of the landslides occurred at a slope of 20-30 °;80% of the landslides occurred during the rainy season,and rainfall was the main factor that caused landslides in the study area.(3)A model of landslide-pipeline geological generalization in the study area was established,and the analysis of landslide-pipe mechanics response was studied by the analytical and numerical methods respectively.Based on the literature and experimental data,the simulation results are compared,which shows that the numerical method can best meet the engineering calculation requirements,and provides a basis for the study of landslide-pipe mechanical response based on numerical method and critical criteria for pipeline destruction.(4)Using the numerical method,the author analyzes the response law and sensitivity of pipeline mechanics under the influence of different factors,and establishes the critical criterion of landslide-pipeline destruction based on landslide displacement and rainfall on the same day.Through the investigation and analysis of the deformation damage characteristics of the prototype landslide-pipeline,combined with the field survey,prototype monitoring data and numerical method,the validity of the landslide-pipeline damage criterion is verified.Comprehensive analysis,proposed landslide-pipeline monitoring early warning technology methods for similar areas of pipeline safety evaluation,monitoring and early warning to provide a certain theoretical basis.