Study On The Interaction Between The Natural Gas Pipeline And Landslide And The Safety Assessment Model

Mountainous natural gas pipelines have large spatial spans,complex regional geological conditions,and frequent disasters.The construction and operation of pipelines face huge challenges.Among them,landslide is one of the major geological hazards that threaten the safety of pipelines.Carrying out research on the deformation mechanism and safety assessment of pipelines under landslide disasters has important engineering practical significance and value,and provides a scientific basis for pipeline selection,laying,and disaster prevention and reduction.Based on relevant scientific research and engineering projects,the paper selects the Sino-Myanmar pipeline as the research object,analyzes the formation mechanism of the Sino-Burmese pipeline landslide and the relative position relationship between the pipeline and the landslide,establishes the interaction model between the pipeline and the landslide,and analyzes the pipeline deformation using ABAQUS numerical simulation software Characteristics,summarizing the criterion of pipeline deformation failure.On this basis,carry out pipeline safety assessment under landslide disaster,including landslide disaster risk assessment and pipeline failure consequence assessment;landslide disaster risk assessment includes landslide disaster risk and pipeline failure,landslide disaster risk includes disaster occurrence probability and prevention effect.Finally,a pipeline safety assessment model under the landslide disaster of the Sino-Myanmar pipeline was constructed,which was applied to typical cases and verified.The main understanding and results are as follows:?Through on-site investigation and investigation,a total of 637 points of natural hazards were statistically analyzed,including 80 landslides,33 collapses,106 unstable mountain slopes,8 ground collapses,1 ground subsidence,353 water damages and 56 engineering disturbance disasters.The survey shows that the number and hazards of landslide disasters along the China-Myanmar natural gas pipeline are relatively large.?Through the investigation of landslides along the China-Myanmar pipeline and the analysis of the genetic mechanism,it is believed that the formation of pipelinelandslides along the pipeline is mainly related to local terrain,mountain topography,stratigraphic lithology,fracture geological structure,rainfall and other human engineering economic activities.?Through the investigation of typical landslides,it is concluded that the relative positions of the gas pipeline and the landslide are as follows: the pipeline passes through the outer edge of the landslide,the front edge of the landslide,the outer edges of the two sides of the pipeline,and the vertical landslide There are six different situations of obliquely crossing inclined landslides and vertical landslides.?Three relative positions of pipeline crossing,longitudinal crossing and oblique crossing landslide were selected,and the deformation of pipeline was analyzed using ABAQUS software.The deformation of pipeline under different influencing factors was studied,and the failure criterion of pipeline deformation was summarized.?On the basis of numerical analysis and simulation,analyze and propose the failure probability assessment index of China-Myanmar pipeline.Based on the relevant regional geology,natural geographic environment and on-site geological survey data,put forward the landslide disaster occurrence probability assessment index and landslide disaster prevention index,and use the analytic hierarchy process And index scoring method,quantify each index to obtain a quantified pipeline risk occurrence index evaluation level under landslide disasters,and use the safety risk assessment matrix to combine the quantitative pipeline risk occurrence probability index level and the semi-quantitative pipeline along China-Myanmar.Combining the levels of failure consequences,a quantitative and semi-quantitative safety risk assessment index model for the China-Myanmar pipeline area was established.?The typical landslide disaster points of the China-Myanmar pipeline are selected to verify the established safety assessment model.The results are consistent with the on-site investigation and analysis,indicating that the established safety assessment model has certain applicability.