高聚物胶凝堆石料动残余变形特性试验研究

发布时间：2018-06-24 20:57

本文选题：堆石料 + 高聚物　；参考：《岩土力学》2017年07期

【摘要】：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。
[Abstract]:Improving the overall stability of rockfill is one of the effective measures for seismic reinforcement of earth-rock dams. For this reason, a technique of polymer cementitious rockfill reinforcement is proposed, which can significantly improve the strength of rockfill and effectively reduce the permanent deformation of rockfill under dynamic load. A series of dynamic triaxial tests with different confining pressure, different consolidation ratio, different dynamic stress ratio and different polymer content were carried out to study the dynamic residual deformation characteristics of polymer cementitious pile. The results show that the dynamic residual deformation increases with the increase of dynamic stress ratio and confining pressure, and when the confining pressure is 300 KPA, the consolidation ratio is 1.5, the dynamic stress ratio is 0.4. The residual strain of the cemented aggregate with 2% polymer content is 74% lower than that of the aggregate under the same conditions. Therefore, the residual deformation of the aggregate is significantly reduced by the polymer. The calculation parameters of Shen Zhujiang residual deformation model are given and compared.
【作者单位】：重庆大学山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院;鲁东大学土木工程学院;河海大学岩土力学与堤坝工程教育部重点实验室;
【基金】：国家自然科学基金面上项目(No.51479059) 长江学者和创新团队发展计划资助(No.IRT1125) 鲁东大学博士基金(No.2016009)~~
【分类号】：TV41

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