Model test study on the influence of subway tunnel drilling and blasting method on adjacent buried pipeline
WANG Haitao1，2，JIN Hui1，JIA Jinqing2，CHANG Shengtao1，YAN Shuai1
(1. School of Civil and Safety Engineering，Dalian Jiaotong University，Dalian，Liaoning 116028，China； 2. State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian，Liaoning 116024，China)
In order to study the adverse effect of subway tunnel drilling and blasting method on adjacent buried pipeline，the laboratory similar model testtaking into account the influence factors such as the charge and the explosion center distance，was carried out based on the project of Dalian metro tunnel. The results show that the vibration characteristics of rock mass and pipeline under the same blasting load are different. The maximum vibration velocity of pipeline is smaller than rock mass，and the attenuation time is slightly different. The ratio of the maximum vibration velocity of pipeline to that of rock mass increases nonlinearly with the charge increasing and the distance decreasing.In order to describe this law，the maximum velocity transfer coefficient and the relative stiffness coefficient of pipe-soil were defined，and the formula of the maximum velocity transfer coefficient for various pipelines and rock mass was established.The relationship between maximum dynamic stress and maximum vibration velocity is linearly increased. Based on this conclusion，the pipeline safety control standard considering the design value of fatigue strength and the current velocity control value of pipeline wasproposed.The safety control standard of C30 concrete pipeline is determined to be2.5cm/s by the method.
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WANG Haitao1，2，JIN Hui1，JIA Jinqing2，CHANG Shengtao1，YAN Shuai1. Model test study on the influence of subway tunnel drilling and blasting method on adjacent buried pipeline. , 2018, 37(S1): 3332-3339.
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2018, Vol. 37 
