Research On Mechanics Of Charging Structure Of Bottom Gas-Space In Deep-hole Blasting Engineering

The method of strengthening the charging at the bottom of the blasting-hole is usually described in traditional teaching-books and blasting engineering, which is used to overcome resistance at the bottom. While the method of the charging structure of vacuum space at the bottom is applied to vacuum exploding. The technology is based on the principle of the rock crash mechanics, and the soft material, such as the gas or water, was used as the space sect. The method can adjust the blasting process, including reducing the climax pressure, prolonging the time of blasting action, minishing the shatter area and improving the utilizing efficiency. The main advantage is depressing the explosive quantity and minishing the destroying to the construction foundation. Meanwhile, which can improve the blasting effect, made the rock fragment more uniformly, and improve the blasting efficiency.In the blasting engineering of foundation pit and high slope area, the two structure of succeeding charging and gap charging are tested by the dynamic photo-plasticity equipment. In the same time, the explode theory is applied to analysis the development and attenuation of the stress. The research on the stress character in the rock under the soft padding material are used to compare the biggest destroy scope and validate the damping effect. Based on the analysis result, the blasting optimum parameter and experiment made some progress.The method of the charging structure of vacuum space at the bottom is applied to the bracer digging engineering. The application of the method to the practical engineering has special requirement, especial the optimum blasting method and parameter, and all these are due to the related elements, which affects the blasting effect directly. When we do research on the method, we must consider the related elements, only in this can we optimize the blasting method and procedure, which can lead to good blasting effect.Based on the research on the blasting mechanics and blasting engineering experience, the related elements and principle are discussed in the paper, and themethod of blasting gap optimum are brought forward, which was validated to be feasible and scientific.