Abstract:The dynamic response of buried pipelines under blasting load is an urgent problem to be solved in urban blasting construction, which has important theoretical and practical significance. Based on the theoretical analysis, this paper has carried on the field blasting experiment to the different sizes of buried seamless steel pipe by changing the dosage and the explosion center distance. The results show: Under the normal working pressure, the larger the ratio of the inner diameter of the steel tube to the thickness of the tube wall, the greater the equivalent stress and equivalent strain, and the allowable compressive strain of the pipe decreases with the increase of the ratio of the inner diameter of the pipe to the wall thickness of the pipe. Through the analysis of the measured data, it is found that:Under the same conditions, the S1 tensile strain is 41% of the S2 tensile strain; the S2 tensile strain is 40% of the S3 tensile strain; the S1 compressive strain is 23% of the S2 compressive strain; and the S2 compressive strain is 58% of the S3 compressive strain. Under the action of blasting load, the circumferential compressive strain of the pipe cross section three is increased with the increase of the ratio of pipe diameter to pipe wall thickness. In this experiment, S3 is most likely to be destroyed, followed by S2, followed by S1. Under the premise of meeting the needs of the project, the pipeline with relatively small wall thickness and small inner diameter can be chosen to effectively increase the anti vibration performance.