论文部分内容阅读
控制断裂是对现行光面爆破技术的改进,本文总结了目前控制裂纹初始扩展方向的三种方法及各自之优点与不足,在此基础上,应用岩石介质中柱状装药所产生的应力波之衰减规律与波在空孔周围的动应力集中解以及动态强度准则而确定了先爆孔与后爆孔之孔距,结合控制断裂方面已有的实验结果提出了一种新的工艺设计。此工艺可利用后爆孔的空孔作用,在后爆孔壁沿预裂方向生成预制裂纹,并使该裂纹在爆炸载荷作用下充分扩展,工序简单,较易推广。
Controlled fracture is an improvement on the current smooth blasting technology. This paper summarizes the three current methods of controlling the initial crack propagation direction and their respective advantages and disadvantages. Based on this, the stress waves generated by the columnar charge in rock media Attenuation law and dynamic stress concentration around the hole and dynamic strength criteria to determine the hole before and after the explosion of the hole burst, combined with the control of the experimental results have been proposed a new process design. This process can make use of the hole effect of the postburst hole to generate the prefabricated crack along the prebuilt direction of the postburst hole wall and make the crack fully expand under the explosive load. The process is simple and easy to popularize.