| In order to solve the problem of great rock clip making effect,low blasting efficiency,small cycle footage and the ratio of mining and tunneling is seriously unbalanced of deep hole parallel cut blasting in hard rock tunnel,using rock mechanics,elastic plastic mechanics,blasting dynamics and other theoretical knowledge,select three typical parallel cut with empty holes of the four corners of nine holes cut,double hollow hole diamond cut and compound barrel cut through theoretical analysis,numerical simulation,model test and field test,the deep hole parallel cut blasting is researched systematically.Based on the theory of rock blasting fragmentation and theory of linear charge blasting,the rock breaking mechanism of deep hole parallel cut blasting are analyzed,and the calculation method of the main parameters of parallel hole cut is given.Application of finite element theory,the numerical simulation of several typical parallel hole cutting processes is carried out,the cutting formation process and distribution law of superimposed stress field are analyzed,and the individuality and commonality of effective stress propagation among different cutting modes are summarized.Using similarity theory,the model test of three kinds of typical parallel hole cut is carried out,the main factors affecting the cutting effect are analyzed,and the optimal design scheme is obtained.Finally,according to the results of model test the field test was conduct to optimize the blasting parameters of the cut,and to determine the best way to cut the hard rock tunnel.Through the experimental study,the explosive consumption is reduced and the blasting efficiency is improved,the imbalance of mining and tunneling is relieved and deep hole cut blasting technology is enriched.which provides a valuable reference for rapid excavation of rock roadway. |
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