Research On The Impact Of Blasting Construction On The Safety Of Long-distance Natural Gas Pipelines

Blasting is a technique that uses compression,loosening,destruction,throwing and killing caused by explosives exploding in air,water or earth-rock media or objects to achieve the intended purpose.Explosion impact is the main form of the third-party damage to the pipeline.The seismic waves caused by blasting are directly transmitted to the buried pipeline through the surface,causing the pipeline to reciprocate and cause damage to the pipeline structure.At the same time,the blasting seismic wave indirectly alters or destroys the geological environment near the pipeline,causing the pipeline to squeeze,bend,and strain.This paper takes the blasting construction of Baishu Village iron ore mine in Liangping County as the research background.Based on the blasting simulation test data,the author analyzes the mechanism and propagation characteristics of the blasting seismic wave,and the main factors that affect the seismic intensity of blasting,combined with the multiple sets of blasting experimental parameters.Reasonable safety precautions.The main research content of the dissertation is as follows:(1)To study the relevant literature on the safety impact of blasting on buried pipelines,analyze the research status at home and abroad from the characteristics of blasting seismic waves,the impact mechanism of blasting seismic waves on pipelines,the vibration reduction measures for blasting vibration,and the prediction of blasting vibration intensity,and master the latest developments in related fields;(2)Study the interaction law of rock under blasting construction,master the hazards of blasting to pipelines,investigate the safety criteria under the blasting construction in various countries and the failure criteria of buried gas pipelines,and provide the safety management of natural gas pipelines under the action of blasting construction;(3)Based on the geological structure of natural gas buried pipelines and its surrounding environment on the canal and drainage lines,nine groups of blasting vibration impact tests on buried pipelines were designed to study the effects of different blasting modes,different blasting distances and different charge volumes on pipeline blasting,and analyze the impact on the artificial The main influencing factors of particle vibration velocity under blasting,with the field loading amount and blasting distance as the main variables,and using on-site vibration intensity monitoring results to analyze the relationship between vibration amplitude and frequency characteristics and different charges and different charge distances;(4)Using data regression method and BP neural network prediction method,the experimental data of the iron ore pipeline in the Drainage and Drainage Line was numerically analyzed,and the ABAQUS finite element analysis software was used to study the pipeline failure mechanism and related parameters under the blasting effect.;(5)According to relevant requirements of the "Blasting Safety Regulations",a set of procedures for calculating the maximum allowable charge for blasting of pipelines was designed.The maximum allowable blasting load was calculated based on the parameters such as the maximum allowable blasting speed in site blasting,the relevant topographic and geological parameters,and the distance between the blasting and the pipeline;(6)Analyze the influence of blasting vibration on the gas pipelines of the canal line,determine the impact of maximum vibration rate,maximum allowable charge and lithology on blasting construction,and propose relevant protective measures for blasting construction,and apply the "Oil and Gas Pipeline Protection Law".Correcting the Safety Criterion for Blasting.