presplitting meaning in Hindi

Study on parameters selection and quality measures in smooth and presplitting blasting
Practice of using deep - hole presplitting blasting technology to drainage methane from extremely - thick coal seam with low permeability
On the basis of the blasting and excavation and the shotcreting and rock bolting process of a large high slope engineering , the vibration transmission laws in the presplitting blasting , the rock caving blasing and the high slope blasting where the vibration is magnified are analyzed and compared . the effect of the blasting on the slope rock mass and the quality of supporting system construction are evaluated . on this basis , the construction quality control measures are worked out