爆炸作用下减震沟对埋地管道振动效应分析

Analysis on explosion vibration effect of damping ditch on buried pipeline

为了研究爆炸作用下减震沟对埋地管道的振动效应的影响,通过现场实验与数值计算相结合,得到可靠的数值模型。建立不同深度减震沟以及不同比例距离的爆破模型,将减震沟深度D修正到质点爆破振动衰减规律多元非线性模型中,利用最小二乘原理求得模型中的未知量K、α、β,得到适用于含有减震沟的爆破环境中的质点振动预测方程。研究表明:减震沟对管道质点的水平方向振动速度的减震率大于竖直方向;多元线性回归所得到的质点爆破振动预测方程具有显著性,在相似的工程环境中具有一定参考性。

In order to study the influence of vibration effect under explosion of buried pipeline of damping ditch, a reliable numerical model was obtained by combining field experiment with numerical calculation. In this paper,the depth of D was modified to the multiva-riate nonlinear model of the attenuation law of particle blasting vibration,the unknown quantity K ,α , β , in the model was obtained by least square principle, the prediction equation of particle vibration was also obtained for the blasting environment with damping ditch. The results show that the damping ratio of the damping ditch on the horizontal vibration velocity of the pipeline is greater than that of the vertical direction ; secondly, the prediction equation of the particle blasting vibration obtained by the multiple linear regression is signifi-cant, and it has a certain reference in the similar engineering environment.