堤坝高聚物定向劈裂注浆试验与有限元模拟

利用自制的定向劈裂钻具,在土坝轴线方向布置若干定向劈裂孔,注入高聚物浆液,进行定向劈裂试验,结果显示:高聚物浆液能够沿预制裂缝扩散并劈裂土体,相互搭接形成2~3 cm厚的超薄防渗墙,墙体与周围土体结合紧密,形成复合防渗体系;采用黏结单元法对高聚物定向劈裂注浆进行数值模拟,计算得出的裂缝扩展长度和宽度与试验结果相近,为堤坝高聚物定向劈裂注浆方案的设计提出了一种有效方法。

Finite-element simulation and experiment on polymer directional fracturing and grouting for dykes and dams

Directional fracturing test was carried out by injecting polymer seriflux to some holes which were arranged along the axis of earth dam with a self-made directional fracturing drilling tool. The results show that the polymer seriflux could diffuse into prefabricated crack and fracture soil, and build an ultra-thin polymer anti-seepage wall about 2 to 3cm thickness by overlapping each other which has closely bonds with the surrounding soil, forming a composite impervious structure. The directional fracturing mechanism of the polymer grouting is simulated by using the bonding element method, the directional crack propagation length and opening width is basically consistent with the field test results. Thus an efficient method is presented for design in polymer directional fracturing grouting project of the dykes and dams.