内壁腐蚀混凝土管道爆破动力失效机制

Dynamic failure mechanism of concrete pipeline with corroded inner-wall subjected to blasting

为了确保爆破振动荷载影响下临近服役多年埋地混凝土管道的安全,开展内部腐蚀混凝土管道爆破动力失效机制的研究.基于Thistlethwayte混凝土腐蚀理论,建立运营期混凝土管道内壁腐蚀缺陷预测理论模型.结合全尺寸承插式混凝土管道爆破模型试验及振动分析,验证承插式混凝土管道爆破动力响应的数值建模方法及参数选择.通过腐蚀缺陷预测,开展不同腐蚀缺陷形态下的承插式混凝土管道爆破动力响应数值试验,分析爆破振动荷载作用下的腐蚀管道动力性能演化规律.结合极限强度准则,确立腐蚀管道主控动力失效准则,提出爆破振动影响下运营期内壁腐蚀承插式混凝土管道的安全控制标准.

The dynamic failure mechanism of concrete pipeline with corroded inner-wall subjected to blasting was analyzed in order to ensure the safety of buried concrete pipeline which had been in service for many years under the influence of blasting vibration load.A theoretical model for predicting the corrosion defects of the inner wall of concrete pipes during the operation period was established based on the concrete corrosion theory of Thistlethwayte.The numerical modeling method and parameter selection of blasting dynamic response of concrete pipeline with bell-and-spigot joints were verified based on the full-scale blasting model test and vibration analysis of concrete pipeline with bell-and-spigot joints.Numerical tests of dynamic response of concrete pipeline with bell-and-spigot joints under different corrosion defects were conducted through the prediction of corrosion defects.The dynamic performance evolution of corrosion pipeline under blasting vibration load was analyzed.The main control dynamic failure criterion of corroded pipeline was established with the ultimate strength criterion.The safety control standard of corroded concrete pipeline with bell-and-spigot joints under the influence of blasting vibration was proposed.