Loose Blasting Mechanism Study Of High-stress Rock In Deep Shaft

On the environment condition of the high stress and high gas, deep rock affected by the high ground stress, especially the lateral stresses. For the deep rock with loose blasting, rock is in the highlands of stress and load together that the two loads affect each other. Deep rock failure criteria is not same with shallow rock failure criteria, and also its process is more complicated. The existence of stress field in the blasting of rock have some impact.on crack direction of expansion and length. Shallow rock blasting parameters blasting to be ineffective for the deeprock, and the blasting efficiency is not good. Based on this reason, the deep hole loose blasting mechanism on condition of high stress in deep rock is explored.In this paper, deep geological and rock mechanical properties appropriate is explored firstly, and then the stress characteristics of deep rock is gained through numerical simulation results of analysis as a supplement. Because deep rock in the initial stress relatively is large, underground rock blasting will be subject to the initial stress field of intervention, an explosion of rock in the initial stress and stress waves together. The initial stress field and the surrounding rock in the blast shock wave superimposed with each other, resulting in cracks in rocks from the direction and length of the crack have a difference.Secondly, through the analysis of rock loose blasting mechanism umder high stress theoretically we can derived from the hole crushing circle wall and the length of the fracture,correspondly discussion of the deep rock blasting parameters of the design. and put forward the corresponding blasting crack length formula. The use of dynamic finite element software LS-DYNA and ANSYS finite element program for high-stress conditions, loose rock blasting the numerical calculation, the calculation results from the analysis of rock mass around the hole after the explosion of the stress and strain changes in the direction of crack extension and length.Finally, on the basis of theoretical analysis and the deep-hole blasting tunnel test in Huainan xinzhuang coal mine, the theoretical part of the corresponding crack length and the length formula of blasting crack are on comparative analysis. As a result we can obtain a more reasonable parameters. These can be loose as a coal mine deep rock blasting design parameters to provide a reference.