Research On The Dynamic Response Of The Rock Pile Slope At The Entrance Section And The Entrance Of The Rock Pile Tunnel Under Blasting Vibration

The effect of blasting vibration on the inlet section and talus slope of mountain talus tunnel is obvious.By the means of the theoretical research,field test and numerical simulation,and by the example of Benxi City,Liaoning Province,Huanren County Tianhuan Railway DaqianShiling Tunnel entrance section of rockfill tunnel and talus slope,this paper has carried out the following research:This paper summarizes the situation and calculation methods of the three-zone theory of blasting load,the type of blasting load model,the basic formula of blasting seismic wave velocity calculation.Thus,the triangular load theory is used to carry out the numerical analysis.Taking the tunnel of the DaqianShiling Tunnel as a research object,the monitoring tests are carried out in the field.When the tunnel blasting excavation is carried out,the primary lining acceleration and the bottom center velocity of the rock pile tunnel are tested and the basic propagation laws of vibration velocity and acceleration on the tunnel side wall are analyzed.In addition,the formula of blasting vibration velocity of the talus tunnel is fitted by using the basic formula of Sadovsky to provide guidance for later construction safety.Based on the slope of the rockfill slope in the front section of the Daqian Shiling tunnel,the velocity and acceleration of the talus slope at different heights under the action of the blasting load are monitored when the rock surface is exploded.With the analysis of slope speed and acceleration,the predicting formulas of the velocity of talus slop at different heights are fitted,which provide guidance for similar projects.The results of the numerical simulation are compared with the results obtained from the field monitoring,which indicates that the numerical simulation of the ideal condition is different from that of the complex field.The assumed parameters need to be actualized to obtain ideal numerical simulation results.With the help of geotechnical analysis software MIDAS-GTS,the stress,displacement,velocity and acceleration of rockfill tunnel and talus slope in different location are analyzed under blasting load.In summary,this paper has implemented relevant research on the basic rules of rock pile tunnel and talus slope under the action of blasting vibration,which can provide reference for the design and construction of similar project in later stage.