Abstract: Developed marble karst in Dahongshan Mine has led to a great deal of water burst in mine shaft and rapid groundwater table lowering, resulting in a large scale of surface subsidence. Through the survey on the site, design and construction of grouting curtain and the evaluation of the effect of water blockage by grouting curtain by various means such as analysis of drilling unit grouting amount, observation of the groundwater tables inside and outside the curtain, water extraction test, electromagnetic wave perspective of drill-hole, drill-hole inspection, etc., it is considered that grouting curtain has an evident water blockage effect and fine quality grouting curtain can play a significant role in water flow interception.

Key words: Karst, Grouting curtain, Groundwater flow control in mines, Evaluation of effect