Numerical simulation of accumulation form of rock blocks tunnel during cutting blasting
In order to control the range of flying rocks in tunnel cutting blasting and ensure the efficiency and safety of tunnel blasting construction,the discrete element software was used to simulate the throwing and accumulation form of rock blocks in cutting body.Combined with a single-line tunnel project of a fast railway,the throwing and accumulation form of rock blocks in cutting body and its main parameters were studied.On the basis of comparing and analyzing the simulation results and actual measurement results of cut rock accumulation form,it is found that the initial velocity of cut rock is an important factor affecting the accumulation form.Under the premise that the initial velocity is 10 m/s,it takes 3.5 s from the beginning of blasting to the complete stop of rock mass,and the final accumulation shape is similar to ellipse.The maximum throwing distance and the front stacking height are in line with the actual measurement results of the project and achieve the purpose of the project.The research results have important guiding significance for the safe construction of tunnel cutting blasting.
tunnel cutting blastingdiscrete element numerical simulationaccumulation form of rock blocksinitial throwing speed
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