폭약의 기폭위치에 따른 발파진동 예측

Abstract

ABSTRACT Prediction of blasting vibration according to priming location of explosion

By Kim, Seung eun Adv. Prof. : Prof. Kang, Choo won, Ph.d, Dept. of Energy & Resources Engineering, Graduate School of Chosun University

Recently civil appeals about the rock excavation work in densely populated urban areas had been increased. So blasting engineers has been tried to control effectively the vibration. Therefore, when the blasting was designed they considered a top priority to safety in the efficiency, reliability and safety of design variables. Determinings the propagation characteristics of blasting vibration factor are location and blasting conditions. Location means that the blasting site and the geometric shape of the structure, the target of rocks and geological features include the mechanical properties. Blasting conditions means that the type of using explosives, weight per delay, composition charging, blasting method, tamping condition, number of free face, distance. This study was carried out to identify the characteristics of the rock in laboratory experiments. For the experiment, the samples were collected quartz porphyry, schist, gneiss in the study area. In order to identify the characteristics of blasting vibration of type of explosives (NewMITE, MegaMEX) and location of priming (top priming, middle priming, bottom priming), this study was carried out 6 cases single hole test blasting and was derived the formula to predict blast vibration. The ground vibration of the type of rocks and priming location was analyzed by nomogram analysis and estimated value of vibration were compared weight per delay's were 0.5, 1.6, 5.0, 15kg. The result of this study can be summarized as follows (1) According to data which is measured and collected by the type of explosives through field experiments by regression analysis, the vibration of NewMITE was larger than MegaMEX under the same blast conditions. However, the decrease was many and the vibration was not far propagated. (2) According to data which is measured and collected by priming location through field experiments by regression analysis, the vibration of middle priming was larger than the other priming location under the same blast conditions and the decrease was many and the vibration was not far propagated. The vibration of bottom priming was not larger than the middle priming under the same blasting conditions, however, the vibration was propagated far and the decrease was little.