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提高坝顶区堆石料整体稳定性是土石坝抗震加固的有效措施之一。为此,提出一种高聚物胶凝堆石料加固技术,该技术能显著提高堆石料强度,并有效地减小动荷载下堆石料的永久变形。为研究高聚物胶凝堆石料动残余变形特性,开展不同围压、不同固结比、不同动应力比和不同高聚物含量的系列动三轴试验。结果表明:高聚物胶凝堆石料的动残余变形随动应力比和围压的增大而增大;在围压为300 kPa、固结比为1.5、动应力比为0.4条件下,高聚物含量为2%的胶凝堆石料产生的残余应变要比相同条件下堆石料的残余应变低74%,因此,高聚物显著减小了堆石料的残余变形。给出了沈珠江残余变形模型计算参数,并进行了对比分析。
Improving the overall stability of rockfill materials in the crest area is one of the effective measures for seismic strengthening of earth-rockfill dam. Therefore, a kind of high polymer geopolymer rockfill reinforcement technology is proposed, which can significantly improve the strength of rockfill materials and effectively reduce the permanent deformation of rockfill materials under dynamic load. In order to study the residual deformation characteristics of geopolymer rockfill materials, a series of dynamic triaxial tests with different confining pressures, different consolidation ratios, different dynamic stress ratios and different polymer contents were carried out. The results show that the residual deformation of high polymer geopolymer rockfill materials increases with the increase of dynamic stress ratio and confining pressure. Under confining pressure of 300 kPa, consolidation ratio of 1.5 and dynamic stress ratio of 0.4, The residual strain of gelled rockfill material with 2% polymer content is 74% lower than the residual strain of rockfill material under the same conditions, so the polymer significantly reduces the residual deformation of rockfill material. The calculation parameters of the residual deformation model of the Shenzhu River are given and compared.