Optimisation And Application Of Deep Hole Blasttrenching Patio Parameters

As an integral part of underground mining in mining enterprises,shaft boring has always been an extremely difficult part of extractive work.The traditional method of boring a shaft is to blast a shallow hole from the bottom to the top,which is slow,unsafe and labour intensive,and the use of digital radar tubes has greatly increased the cost of boring.This paper investigates deep hole blasting technology for shaft boring using a combination of theoretical analysis,numerical simulation and field industrial experiments.1)A survey of the geological conditions of blasting engineering was carried out and the mechanical parameters of the experimental mine rock were obtained using uniaxial compression tests and Brazilian splitting tests.2)Based on the theory of blast rock breaking,the influencing factors of the deep hole blasting process of well formation are analysed,and the analysis and calculation of the comminution area and fracture zone produced by blasting rock are carried out.Theoretical calculations are made for the main parameters.3)Numerical models for deep hole blasting in various types of patio excavations were constructed,and ANSYS/LS-DYNA numerical simulation software was used to simulate the deployment parameters of deep hole blasting,and the cavity formation effects of different gun hole spacing,slotting methods and full patio models were investigated.The numerical simulation of single hollow hole and charge hole showed that the distance from the charge hole to the hollow hole was 30 cm,and the numerical simulation of different hollow spacing of 5-hole and 7-hole barrel hollowing showed that as the hole spacing increased.The numerical simulation of the cavity formation process shows that the overall hollowing effect is satisfactory;the simulation of the auxiliary hole shows that a good cavity can be obtained at a hole distance of 60～70 cm.4)Based on the blasting parameter design and numerical simulation results,the deep hole blasting parameters and blasting plan were determined and tested in the field,and the blasting results met the design requirements.Figure 63;Table 14;Reference 61...