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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。
Using self-made directional cleaving drill, several directional cleaving holes are arranged in the axial direction of earth dam, polymer slurry is injected and directional cleavage test is carried out. The results show that the polymer slurry can diffuse and split the soil along prefabricated cracks, Overlap each other to form a 2 ~ 3 cm thick ultra-thin cutoff wall, the wall and the surrounding soil combined closely to form a composite anti-seepage system; bonded unit method of polymer oriented fracturing grouting for numerical simulation, calculated The length and width of the crack propagation are similar to the test results, which provides an effective method for the design of the directional fracture grouting scheme of polymer embankment.