The blasting vibration load can pose great threats to the safety of urban buried pipelines. Winkler model is commonly used to simulate the soil-pipe interaction and calculate the response of the stiff pipe, but the effectiveness of the resulting for the flexible pipe is doubtable. In this study, a theoretical method based on the Winkler model and the Timoshenko beam theory is presented to calculate the effect of blasting load induced by rock blasting on the overlying flexible buried pipe, and the modified soil spring stiffness is provided for accurately calculating the vibration response of flexible high-density polyethylene (HDPE) pipe buried in the silty clay. The proposed theoretical method and modified spring stiffness are tested and calibrated against full-scale experiments and its detailed numerical modeling with ANSYS/LS-DYNA. It is indicated that the analytical method with empirical spring stiffness (from American Lifeline Alliance 2001) overestimates the vibration velocity magnitude of the HDPE pipe subjected to blasting vibration. Reducing the spring stiffness to one-tenth of the original value can provide improved calculation results for flexible HDPE pipe subjected to blasting vibration.

爆破振动载荷会严重威胁城市地下管道的安全。Winkler模型通常用于模拟土管相互作用并计算刚性管的响应，但所得结果对于柔性管的有效性值得怀疑。本研究提出了一种基于Winkler模型和Timoshenko梁理论的理论方法来计算爆破荷载对上覆柔性埋管的爆破荷载影响，并提供修正的土弹簧刚度以准确计算振动高密度聚乙烯（HDPE）埋在粉质粘土中的管道的响应。所提出的理论方法和修改后的弹簧刚度已针对全面实验进行了测试和校准，并使用ANSYS / LS-DYNA对其进行了详细的数值建模。结果表明，具有经验弹簧刚度的分析方法（来自美国生命线联盟，2001年）高估了爆炸冲击作用下HDPE管的振动速度幅度。将弹簧刚度降低到原始值的十分之一，可以为遭受爆破振动的柔性HDPE管提供更好的计算结果。