Jiang Nan, Zhang Yuqi, Wu Tingyao, Yao Yingkang, Luo Xuedong
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China.
Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China.
Sensors (Basel). 2021 Oct 31;21(21):7252. doi: 10.3390/s21217252.
A key aspect of urban blasting engineering is evaluating the safety of the blasting dynamic load on the adjacent high-density polyethylene water supply pipeline and controlling the negative impact of the blasting vibration load on the pipeline. According to the special characteristics of the soil layer in Shenzhen coastal city, a field blasting test of a full-scale pre-buried HDPE pipeline was carried out, and the distribution characteristics of the blasting vibration velocity and dynamic strain were analyzed. The finite element model was established by LSDYNA, and the reliability of the calculation model and parameters was verified by comparing with the field test data. At the same time, the dynamic response characteristics of pipelines with different buried depths, operating water conveyance pressures, and diameters under blasting vibration loads were studied. Combined with the circumferential allowable stress control criterion of the pipeline, the safety control standard of the blasting vibration velocity of the HDPE water supply pipeline under different working conditions was proposed. The results show that the circumferential compressive strain of the HDPE pipe is the most affected by blasting vibration, and the pipe with the shortest blasting center distance has the largest response. The vibration velocity and equivalent stress of the pipeline increase with the increase of buried depth, internal pressure, and diameter. The vibration velocity and equivalent stress of the explosion side at the same section of the pipeline are greater than those of the back explosion side. Based on the dimensionless analysis, the vibration velocity prediction model of the buried depth, operating pressure, and diameter of the pipeline is proposed. The safety control velocity of the pipeline is 25 cm/s, and the vibration velocity of the upper surface is 22.5 cm/s according to the Mises yield strength criterion.
城市爆破工程的一个关键方面是评估爆破动荷载对相邻高密度聚乙烯供水管道的安全性，并控制爆破振动荷载对管道的负面影响。根据深圳沿海城市土层的特殊特性，开展了全尺寸埋地HDPE管道的现场爆破试验，分析了爆破振动速度和动应变的分布特性。采用LSDYNA建立了有限元模型，并通过与现场试验数据对比验证了计算模型和参数的可靠性。同时，研究了不同埋深、运行输水压力和管径的管道在爆破振动荷载作用下的动力响应特性。结合管道的环向许用应力控制准则，提出了不同工况下HDPE供水管道爆破振动速度的安全控制标准。结果表明，HDPE管道的环向压缩应变受爆破振动影响最大，爆破中心距最短的管道响应最大。管道的振动速度和等效应力随埋深、内压和管径的增加而增大。管道同一截面爆炸侧的振动速度和等效应力大于反爆炸侧。基于无量纲分析，提出了管道埋深、运行压力和管径的振动速度预测模型。根据米塞斯屈服强度准则，管道的安全控制速度为25cm/s，上表面振动速度为22.5cm/s。
