静压套管控制灌浆在渗漏围堰处理中的应用

Application of Grouping with Static Pressure Casing in Treatment of Cofferdam Leakage

摘要:

静压套管控制灌浆法,就是从钻孔工艺出发，针对土石围堰结构的特点，采用跟管钻进，有效地解决了松散岩层和填筑地基中钻孔施工的护壁问题，不易发生塌孔埋钻等事故，提高钻孔成孔效率。另外，由于开孔孔径比一般的地质钻孔大，在灌浆时，增大浆液接触孔壁的面积，有利于浆液的扩散，提高灌浆效果。从灌浆控制性理论出发，结合套管定位，调整灌浆压力和浆液配比，控制灌浆浆液的扩散半径，使得灌浆部位和效果得到有效的控制。介绍了静压套管控制灌浆法在贵州董箐水电站围堰防渗堵漏中的应用。

Abstract:

According to the characteristics of cofferdam, control of grouting with static pressure casing was used for wall protection of borehole construction in unconsolidated formation and filled foundation to increase efficiency of borehole completion. Combined with casing location, grouting pressure and slurry ratio were adjusted to control the diffusion radius of grouting slurry and control the grouting location and grouting effect. The paper also introduced the application of control of grouting method with static pressure casing in anti-seepage for cofferdam of Dongqing hydropower station in Guizhou.