A New Technology of Rapid Sealing Roadway in Luotuoshan Coal Mine

After the large water accident with the serious collapse occurred in Luotuoshan coal mine, to achieve rescuing emergency rapidly, the scheme with blocking up water was adopted. The concerned technical measures include forming blocking up water wall‘s skeleton through injecting two-fluid slurry into tunnel, filling these gaps in skeleton with high flow under static pressure condition, reinforcing alluvium on the tunnel floor with high pressure, and filling tiny cracks in block up water wall with draining. The tunnel was blocked up successfully in only 54 days and the effect reaches 99.97%. The successful application of these technical measures provided valuable experiences that can draw lessons for engineering works under similar conditions in the future.