Optimization of Floor Grouting Reinforcement Depth Based on Elastic Modulus of Composite Rock Mass
Taking the floor grouting reinforcement and renovation working face in Jiaozuo mining area as the research background,the elastic modulus of rock mass before and after floor grouting was measured by ultrasonic method,the change characteristics of the overall strength of composite rock strata within the range of grouting depth were obtained quantitatively,and the influence of floor grouting reinforcement on the failure zone of composite rock floor was analyzed.The research shows that the elastic modulus increases respectively after grouting reinforcement.Mudstone increases by 640％-852％,sandy mudstone increases by 241％-641％,sandstone increases by 221％-247％,L9 limestone increases by 176％and L8 limestone increases by 40％-159％.The failure depth of floor decreases by about 62％,which is from 30.59 m to 11.7 m.As the failure depth of the floor decreases after grouting reinforcement,the thickness of the absolute waterproof layer increases.The depth of grouting reinforcement for the floor of working face was optimized by adopting a double-layer three-dimensional hole layout method.While ensuring the grouting effect of the floor,the total drilling depth of the 3140 m project was reduced,and the construction period was saved by 35 days compared to the original plan.
Mining of heavy-water depositElastic modulusFloor grouting reinforcementStrength of composite rock massUltrasonic method
万方数据
维普
