Working Condition Parameters Of Buried Gas Pipeline Under Blasting Vibration Analysis Of Vibration Characteristics Of Pipe And Soil

Pipeline transportation is one of the five transportation methods,and the buried pipeline is used for long-distance transportation of natural gas with the economy and high efficiency.With the construction of infrastructure in our country,the blasting technology has been widely used in the construction of tunnel,roadbed and other projects,the seismic effect of blasting may affect the safety of buried pipelines nearby.Therefore,it is necessary to carry out related research on vibration characteristics of blasting earthquake buried pipeline and its surface,for the optimization of blasting parameters and establish the monitoring standard of blasting vibration to ensure to provide theoretical basis for the safe operation of underground pipelines.The following in Lanzhou Chengdu Chongqing buried natural gas pipelines into the West Passenger Line Tunnel fairy rock blasting project,three-dimensional finite element power includes the establishment of pipelines,rock,soil,natural gas and explosives,calculation model,calculation results in verifying the accuracy of basic model,analyze the influence of blasting vibration of buried gas pipeline the diameter,wall thickness and depth parameters of the pipeline and the ground vibration characteristics and pipeline Von-Mises stress.Calculation of vibration model can better simulate the pipeline and its surface according to the three-dimensional finite element dynamic building location,on-site pipeline and tunnel engineering geological conditions and the numerical simulation of blasting seismic wave,the measured seismic waveform and the corresponding position of high similarity,the relative error of calculation and the measured value is less than 11%vibration strength.When the depth of tunnel 41.5m and tunnel blasting equivalent charge 25kg,vertical vibration velocity of particles increases with rock and explosive distance decreases,and the performance is more far away from explosion source,its attenuation is slow,the vibration velocity of blasting source above the rock soil interface decreases to about 3cm/s;soil.The velocity in the pipe near the surface of the earth,there are two extreme points.Further dynamic analysis of different pipe diameter and wall thickness and buried depth and soil parameters of the response results,the pipe wall thickness increased,pipeline peak particle vibration velocity decreases,and the soil surface velocity is basically unchanged;with the increase of pipe diameter,the peak particle vibration of pipeline speed decreases,the surface velocity is reduced.The same pipe;compression ratio of diameter and wall thickness of pipeline for Von-Mises stress has a great influence,the influence of the buried depth of pipeline is relatively small;the pipeline buried depth increases,the peak particle vibration velocity decreases pipeline,but the pipeline above the surface soil physical point velocity increases.