#TITLE_ALTERNATIVE#

• Main Author: XU (NIM : 12106016); Pembimbing : Dr. Eng. Nuhindro P. Widodo, ST.,MT., SELVIANA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19442
• Institution: Institut Teknologi Bandung

Underground mining activities must be related with material excavation, especially massive rocks that can't excavated with conventional method, so that blasting must be done. This blasting result in toxic gases, this gases must be control regard to this activity work and closed space. There for in underg blsting act, a good mining ventilation system must be apply. The main porpose from this mining ventilation system is can provide fresh air inside the mining ud area which this fresh air needed by miner and machineries and also control cirkulation of air. This fresh air will to neutralized toxic gases, reduce dust concentration level, and finally will lower the temperature that can meke a comfortable workimg situation. <br /> <br /> <br /> In this research, we used 2 boxes that reperesented working area in underground mining and analized the smoke clearing effect mainly in stope. So far, from this research can predict the decresing rate of gas concentration from blasting act versus time so can lower <br /> <br /> <br /> accident that occur in underground miing mainly Health and safety isues. Method that we used in this research was gas tracer method. This method done by injecting such gases into the box. The changing of gas concentration neasure by gas detector. This detector placed at exhaust line. Gas that trapped inside this detector calculated in period of time. The result from thjs detector calculation is resulting concentration versus time curve. <br /> <br /> <br /> That 2 boxes had different dimention so we can see relation dimention of box with air exchange rate. At the same time, we done this research at different condition. First condition is combination between blower system and exhaust system. Second condition is only exhaust system. Third condition is only blower system. From this, we found that the first condition was better than the others condition. Air exchange rate at box A is 1,2-1,41 /minute and at the box B is 0,96-1,02 /minute. By natching these curves we found dispertion coefisien for each box at first condition are at box A, 45-57m2/minute <br /> <br /> <br /> and at the box B, 18.6-25 m2/minute . Also, this research indicared air was not distributed at the same level. This condition made several area inside the box were not preceieve fresh air from intake fan. An other results from this research we can see the same decresing level of gas concentration from precious research that done by de souse (1993) at stope. Otherwise, from this research, we also know that the dispertion coefisien that used in the equal De Sousa (1993) is a function of fan configuration and duct displacement.