节理充填岩体爆炸应力波传播规律模型试验与应用研究

Model tests and application research on propagation laws of blasting stress wave in jointed and filled rock mass

为研究节理厚度对爆炸应力波传播影响规律,以工程现场揭露的红黏土为充填介质,制作含节理爆破模型,开展不同厚度节理爆破模型试验,并对现场试验爆破参数进行优化。研究结果表明:节理充填介质延长了爆炸应力波传播时间并吸收了部分应力波,应力波衰减速率为2. 225～4. 188 MPa/mm,滞后时间0. 1～0. 15μs/mm;节理对不同方向的应力波吸收程度不同,横向应力的衰减速率大于纵向应力的衰减速率,二者均随节理厚度的增加呈线性衰减。爆破参数优化应控制炮孔至节理面的距离、减小装药量,周边孔宜采用空气间隔分段装药。

In order to study the influence laws of joint thickness on the propagation of blasting stress wave,a blasting model containing joint was established by using the red clay excavated in the engineering site as the filling medium.The blasting model tests under different joint thickness were carried out,and the blasting parameters of field tests were optimized.The results showed that the joint filling medium prolonged the propagation time of blasting stress wave and absorbed part of stress wave,the attenuation rate of stress wave was 2.225-4.188 MPa/mm,and the delay time was 0.1-0.15μs/mm.The adsorption degree of joint on the stress wave in different directions were different,the attenuation rate of transverse stress was larger than that of longitudinal stress,and both of them attenuated linearly with the increase of joint thickness.When optimizing the blasting parameters,the distance between the blasting hole and the joint surface should be controlled,the charge quantity should be reduced,and the air interval deck charge should be used in the surrounding holes.