Research and application of high water filling material inadjacent position grouting

ZHAO Wenhua; LIU Pengliang; YU Jianhao

doi:10.11799/ce202501010

Abstract：In order to address the problems including the damage of the integrity of narrow coal pillar at the drilling field,the high cost of filling mining,the complex construction technology,and the lower strength of cemented backfill on the site,the selection of grouting materials,the grouting technology and the field practice were investigated and the feasibility of adjacent grouting at the caving areas was evaluated based on the background of the drilling field filling of 15202 working face in the Sanyuan Fuda Mine.The adjacent grouting with high-water material in caving area was put forward.The macroscopic mechanical properties such as the compressive strength,fluidity and setting time of the high-water materials were measured with the laboratory tests.The obtained results indicated that,the strength of high-water material after curing of 28 days is up to 6.3 MPa,and the slurry flow is 461.5 mm,the setting time is around 10 min when the water-solid ratio is 2∶1.The high-water material with higher fluidity can fill the drilling field.The early strength and rapid solidification characteristics make it condense in a short time.Field practice proved that the adjacent grouting technology with the high-water material can provide an effective reference for the design and construction of the grouting reinforcement in the drilling field,and maintain the stability and safety for the narrow coal pillar.