承插式混凝土管道爆破振动动力响应尺寸效应研究

Size effect of dynamic response to blasting vibration of socketed concrete pipeline

为研究爆破振动作用下不同内径规格承插式混凝土管道振动响应存在的尺寸效应,通过现场邻近管道爆破试验及其振动监测数据验证,结合动力有限元软件建立多尺寸管道爆破动力数值计算模型,分析承插式混凝土管道爆破振动响应特征;基于量纲分析基本理论,考虑管道尺寸效应影响建立管道爆破振动速度预测模型;结合混凝土的动抗拉强度,提出了不同内径混凝土管道的爆破振动速度控制标准。研究结果表明:管身和管道承插口峰值应力的出现存在时间差,管身峰值应力大于管道承插口,并随着管道内径的增加,两者峰值应力差值逐渐降低;在爆破地震波作用下,混凝土管道峰值振动速度随着管内径的增加而逐渐降低。

In order to study the size effect of the vibration response of socketed concrete pipes with different diameters under the action of blasting vibration,a numerical calculation model of the blasting dynamic multi-size pipes was established by the blasting test of the adjacent pipes on site and the verification of the vibration monitoring data.The characteristics of the blasting vibration response of socketed concrete pipes were analyzed based on the basic theory of dimensional analysis,considering the effect of pipe size,the prediction model of pipe blasting vibration velocity is established,combining with the dynamic tensile strength of concrete,and the control standard of blasting vibration speed of concrete pipes with different inner diameters is put forward.The results show that there is a time difference between the peak stress on the pipe body and the pipe socket.The peak stress on the pipe body is greater than that of the pipe socket.With the increase of the inner diameter of the pipe,the difference between the two peak stresses decreases gradually.Under the action of vibration wave,the peak particle velocity of concrete pipe decreases with the increase of the pipe’s diameter.