Numerical Simulation Analysis Of Tunnel Construction Blasting With Layered Surrounding Rock

With China’s rapid economic development, the development of underground works more fancied.Underground cavern often encounter the phenomenon of high ground stress,high geothermal,high altitudeand high groundwater level.And tunnel during excavation where geological conditions are verycomplex,different tunnels have different geological conditions,even if the same tunnel has the differentgeological conditions in the different tunnel section.So it bring a lot of impact for the construction ofunderground works. Layered surrounding rock is one of the tunnel excavation often encounter anengineering safety threats of adverse geological conditions. Large section blasting in layered rockconditions, surrounding rock due to the impact of bedding fractures, Blasting high-pressure gas expansionstart with the weakest layer inside,and made the rock spalling. If handled properly layered rock tunnel,it iseasy to form a large area of the tunnel with flattened and collapse. It not only led to the tunnel ultra, butalso be a security risk.In this paper, I use the rock blasting theory, combine the Bulunkou–Konggu hydropower station, andsimulate the layered rock tunnel under construction blasting and granite tunnel with finite element softwarenamed ANSYS/LS-DYNA. By comparing the results of simulation of two different rock conditions, I drawsome of the blasting vibration wave propagation in layered surrounding rock, attenuation law, the law ofdestruction and blasting process stress field distribution and changes.I also get some layered surroundingrock blasting overbreak the solution to the problem.It is a reference and a basis for future layered rocktunnel construction blasting.