| Blasting as open-pit mining,rock excavation engineering projects and other projects mainly rock means.In the process of improving the productivity of the blasting power also makes the slope collapse,slip and other geological disasters frequently.To study the effect of blasting dynamic effect on the slope,and how to guarantee the stability of the slope has become the key technical problems of mine production safety,the safety of the blasting technology and reasonable economy prevention measures for mine safety production has important theoretical significance and practical value for engineering applications.Based on the comprehensive research method of blasting vibration test,blasting dynamic load reduction and quasi-static calculation in an opencast phosphate rock in Guizhou,carried out the slope blasting vibration reduction for data analysis,the blasting dynamic load calculation,mechanical analysis of potential landslide by sarma method,slope stability safety criteria and a series of research work.The main contents and achievements of the paper are as follows:(1)This article is based on an open-air phosphate rock in Guizhou,with the aid of TC-4850 N blasting vibration tester,based on the linear fitting the measured data,the ore get obeys the law of the blasting site attenuation Sadowski's formula.According to the measured three-axis regression Sadowski's formula vector,the vibration velocity attenuation formula is obtained,and the blasting dose of different blasting distance is obtained according to the vibration velocity.(2)Using the sarma method of limit equilibrium,the safety factor of slope under gravity is 1.47 by means of geotechnical analysis software.(3)Calculating the explosive load into equivalent static load on the slope shows that the blasting vibration will reduce the stability of the slope,the blasting distanceand blasting dose of two sensitive factors influencing slope stability were analyzed,the results show that the blasting distance and the safety factor of the slope stability coefficient of fitting equation are obtained when the blasting dose is determined.By contrast,found that when the blasting distance is less than 60 meters,the slope safety factor is greatly influenced by the blasting distance,which indicates that the slope safety factor is sensitive to the blasting distance in the range of 60 meters.When the blasting distance is greater than 40 meters,the control of the maximum dose is less than 140 kg,the influence degree of blasting effect is less than 10%,believe the blasting dosage is safe. |
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