超近距并行管沟精确爆破开挖的模拟分析

Simulation analysis of precision blasting excavation of super-close parallel piping trench

为了探究超近距并行管沟爆破开挖对在役管线的影响,在现场实验的基础上,利用ANSYS/LS-DYNA数值模拟软件,研究了3种方案的爆破振动对在役管线的影响规律。结果表明:在爆破开挖作用下的现场实验和数值模拟中,在役管线质点在y方向的峰值振速均大于x方向与z方向的振速,且y方向的峰值振速在地面最大,管线迎爆面次之,背爆面最小;在其他条件相同的情况下,药包中心距离管线越远,钻孔越深,管线受到的爆破振动越小,管线受影响的范围越小。分析得到方案2为超近距并行管沟爆破开挖的最优方案,对实际工程具有一定的指导意义。

In order to explore the effect of super-close parallel piping trench blasting excavation on existing piping trench,on the basis of field test,combined with numerical simulation software ANSYS/LS-DYNA,three design schemes of effects of blasting vibration on working pipeline are studied.The results show that both field test and numerical simulation indicate that under the blasting excavation,in working pipeline,the peak particle vibration velocity in ydirection is larger than that of xand zdirection,and it＇s the largest velocity on the ground,the surface blasting one is smaller,and the back surface one is minimum.Under the same other conditions,the further the charge center is from working pipeline,the deeper the borehole is,the weaker the blasting vibration on working pipeline is and the smaller the affected scope is.The scheme 2is the optimal solution,which has a certain guiding significance on actual projects.