地铁隧道钻爆法施工对邻近埋地管道影响的模型试验研究

doi:10.13722/j.cnki.jrme.2016.1409

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Abstract

In order to study the adverse effect of subway tunnel drilling and blasting method on adjacent buried pipeline，the laboratory similar model test taking 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 was proposed. The safety control standard of C30 concrete pipeline is determined to be 2.5 cm/s by the method.

Key words： metro tunnel drilling and blasting method model test pipeline vibration characteristics pipeline control standard

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1409 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3332

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