Blasting vibration response law and grey correlation analysis of PE pipe-line
In order to reduce the vibration damage caused by tunnel blasting construction on the existing buried PE pipeline,it is necessary to understand the various factors affecting the vibration effect of pipeline before construction.According to the field measured data,MIDAS GTS NX software was used to establish a three-dimensional numerical model of rock and soil bulk tunnel-PE pipeline,and the field monitoring results and numerical simulation results were compared and analyzed to verify the reliability of the numerical model.The results show that the maximum vibration velocity of the pipeline increases with the increase of soil elastic modulus,Poisson's ratio and pipe diameter under blasting vibration.Due to the superposition of the surface free surface,the maximum vibration velocity of the pipeline decreases first and then increases with the increase of the buried depth.The grey relational degree theory is used to determine the influence degree of four different factors on the vibration effect of pipeline,and the primary and secondary relationship is as follows:elastic modulus of soil＞buried depth of pipeline＞Poisson's ratio of soil＞diameter of pipeline.Accurately understanding the influence of various factors on pipeline vibration can better evaluate the safety of PE pipeline during tunnel blasting construction,and provide reference for the actual construction of the project.
万方数据
维普
