Simulation Experiments Study On Permeability Improvement Technology Of Presplitting Blasting Through Floor Cross-measure Boreholes

Coal plays an important role for the healthy development of the national economy, but at the same time, mine gas disasters are also mainly of the Chinese coal mine safety hidden trouble. In order to effective prevention and control of gas disasters, in view of the pre-splitting blasting anti-reflection technology, in this paper hole pre-splitting blasting coal seam floor wear layer anti-reflection similar simulation experiment research topic is proposed. Wear layer hole pre-splitting blasting relative to the bedding hole pre-splitting blasting is safer, has more application prospects, need to further research, especially study the influence of blasting of coal seam roof and floor, for prevention and control of gas disasters, efficient to protect the safety of mine production has very important practical significance.First of all, based on different subjects such as explosion mechanics, rock mechanics, the fracture damage mechanics, on the basis of theoretical analysis, analyzed the test institute involved in the research status at home and abroad. And based on the mechanism of deep hole pre-splitting blasting anti-reflection paper summarizes the research status. A detailed analysis of the explosive was detonated in the blasting hole, detonation wave, detonation gas, coal seam gas and control hole blasting effect and mechanism of increasing permeability in coal seam.Secondly, analyzes and summarizes the theory of resemble simulation. This test is similar simulation test, in order to ensure the similarity simulation test results to have practical engineering significance, must satisfy the similarity theory between the similar simulation model test and engineering practice of prototype.Finally, on the basis of C13-1coal seam in Huainan mining area and the actual conditions of the floor strata, according to the basic principle of the similarity theory, using the geometric ratio of30:1was constructed in the laboratory experimental system of similar simulation. The completion of the simulation test of similar materials ratio test and the similar simulation experiment to wear pre drill layer splitting blasting, the suitable ratio of similar material in this experiment, effects of blasting in coal seam fracture extension and different blasting and blasting effect under the condition of coal seam roof and floor. Based on the changes of coal and rock related parameters before and after blasting by super dynamic strain gauge and Static strain gauge, qualitative analysis of the variation law of coal and rock stress before and after blasting, Comprehensive analysis of the effect of presplitting blasting through floor cross-measure boreholes.This article mainly through analysis of the deep hole pre-splitting blasting anti-reflection mechanism and the analysis of the similarity theory, the blasting of anti-reflection and the influence of the blasting of Wear layer coal seam roof and floor of coal seam was studied by similarity simulation experiment, For the engineering practice of deep hole pre-splitting blasting parameters design provides the basis of the test, at the same time also to wear layer drilling deep hole pre-splitting blasting theory provides a test analysis of the research.