[en] At present, the most surrounding rocks of sandstone-type uranium mines in China are mudstone, sandstone, pelitic siltstone, and so on. They show the characteristics of soft rock. Such uranium deposit is not fit for in-situ leaching. If the uranium ores are mined by conventional mining method, one of the problems to be solved is the support technique in the soft rock roadway. So, taking a uranium mine in Inner Mongolia as the research object, the support technique in the soft rock roadway of the sandstone-type uranium deposits is studied. Through on-site engineering geological investigation and laboratory test, the main reasons for roadway damage are analyzed. A technique of support in the soft rock roadway of sandstone-type uranium deposits is put forward by drawing on the expericnce of soft rock roadway support in coal mines. The roadway shape and support parameters are optimized by using a numerical simulation method. The results verified the feasibility of the supporting technique. (authors)

[en] Blasting fragmentation is mostly determined by ore sampling and screening after blasting in the present study. This method needs to determine parameters by means of conditional experiment of field blasting with high cost and long time. A new method of using SHPB test data and numerical simulation is presented. The areas of blasthole crushing zone and fissure zone can be determined with the new method, and the blasting fregmentation can be effectively forecasted according to the determined area. The new method is simple in operation, requires little time and low cost. A new method and idea are provided for the theoretical analysis of blasting fragmentation and adjusting the blasting parameters. (authors)