Numerical Simulation On Filling Length Of Tunneling Blasting Hole In Tunnel

The blockage of tunnel blasting blasthole is an extremely important part of roadway blasting blasting.In actual engineering,due to the irregular construction and geological conditions of workers,etc.,the actual blasting operation will occur.Unnecessary dangers will inevitably lead to errors in the project,which will result in economic losses and threaten the safety of life.In actual engineering,the length of the packing is often determined by the empirical formula,and the footage of the tunneling blasting cannot be achieved.The flatness of the surrounding rock cannot be ensured,and the roadway cannot be completed on time.The maintenance of the roadway is directly related to the completion of production and the safe operation of the work.Blasting and excavation is a common and cost-effective excavation method for underground mining.In this paper,the theoretical adjustment and numerical simulation of the boring eye,the auxiliary eye and the peripheral eye of the roadway are simulated to simulate the optimal clogging length and applied to the field practice.Explain in detail the different methods and advantages and disadvantages of the application of roadheader and explosive blasting under general geological conditions under ordinary underground,with the characteristics of rock mass,economic feasibility,completion time,and engineering conformity,indicating explosives.Blasting the realities of the recent decades of mining engineering continues to exist.Based on the analysis of the principle of rock mass failure and the application of several major models of rock mass instability,the foundation of the blasting type hole of the three major types of roadway boring is calculated.Combined with the research results of the predecessors,the calculation model is set up to obtain the reasonable blockage length of the groove and the auxiliary hole.The surrounding holes in the field are mostly caused by light explosion,and the relationship between the peripheral light burst and the hole spacing is calculated separately.In terms of computer simulation,relying on LS-DYNA,the applicationrationality of computer combined finite element is discussed,parameters are discussed,and the verification of computational simulation is served,which is the basis for subsequent application research in practical engineering.LS-DYNA is used to calculate the parameter setting of the slotted hole and the auxiliary hole.The simulation calculates the groove and the reasonable blockage of the length of the auxiliary hole,and separately analyzes the length of the surrounding light burst.The specific stress state image of each blasting time point is cut off,and the final forming effect of the blasting is obtained,and the calculation of the clogging length is verified.The computer combines finite element to guide the on-site blasting.Under the support of the traditional energy density method,the optimum energy density method suitable for roadway excavation is used to calculate the depth of the sluice hole and the auxiliary hole depth of 2.2m and 2m respectively,and the optimal clogging length is 0.4m and 0.56 m respectively;The optimal clogging length of the peripheral eye is calculated separately,and the length of the surrounding smooth blasting block is about 55 percent of the hole spacing.The numerical simulation analysis of the three types of holes in the roadway blasting is carried out and applied to the actual project on site.A reasonable conclusion is drawn to prove the feasibility of the research work on site.