Research on Concentrated Energy Blasting Technology of Tunnel Construction Under Complex Geological Conditions
In the project of Baihe Tunnel,according to the level of surrounding rock,geological characteristics,tunnel buried depth and its in-situ stress and rock burst,based on the three-dimensional finite difference inversion results of in-situ stress field,using the basic principle of concentrated energy water pressure smooth blasting,through the production process of concentrated energy water pressure smooth blasting pipe,the blasting parameters are obtained.The blasting effect of fracture zone and high stress surrounding rock is analyzed,and the stress and rock burst of surrounding rock along the line are evaluated and predicted respectively.It is determined that the fault fracture zone and high stress surrounding rock section are excavated by the method of concentrated energy water pressure blasting.The utilization rate of blasting holes in the fault fracture zone and the surrounding rock section of high ground stress is more than 87%,and the rate of surrounding shot hole is more than 90%.Compared with conventional smooth blasting,the footage per cycle is significantly improved,the explosive consumption and the maximum over-excavation amount are significantly reduced,and the control effect of medium and above rock burst is good.
plateau tunnelsconcentrated energy blastingsurrounding rockground stressfracture zone
NETL
NSTL
万方数据
维普
