水库土坝劈裂式灌浆施工技术

Treatment Technique of the Splitting Grouting to Reservoir's Earth Dam of Reservoir

某水库主坝为均质土坝,劈裂灌浆施工前,坝体出现多条裂缝,坝坡及坝坡脚等多处渗漏水,坝土体渗透系数为6.41×10-4cm/s,坝体稳定性差。经采用劈裂灌浆施工后,其渗透系数降低至2.62×10-8cm/s,帷幕泥墙厚度及其连续性达到设计要求;坝坡及坝坡脚的渗漏水点已消除,坝体未出现新的裂缝,达到除险加固的目的。

A reservoir＇s main dam is comprised of homogeneous earth. Before the splitting grouting to the earth dam, several cracks emerged in dam boy and water leakage was found at the dam slopes and toes with a permeability coefficient of 6.41×10-4crn/s. The dam was of poor stability. After the splitting grouting, the permeability coefficient was reduced to 2.62×10-8crn/s and the thickness and continuity of curtain wall meet the design requirements, and water leakage had been eliminated and no new cracks appeared. It achieves the ouroose of reinforcement.