欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
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300kPa、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。
英文摘要：
One of the effective aseismic reinforcement methods in rockfill dam is to improve the overall stability of rockfill at the upper part of the dam. Hence, a polyurethane foam adhesive （PFA） was frstly applied to reinforce rockfill materials, which can obviously enhance the shear strength and efficiently reduce the permanent deformation of the mixed material. A series of dynamic triaxial shear tests was conducted to investigate residual deformation behaviors of the PFA-reinforced rockfill materials under different confining pressures, consolidated stress ratios, cyclic stress ratios and PFA ratios. Testing results show that the residual deformation increased with increasing dynamic stress ratio or confining pressure in the PFA-reinforced material. Under the conditions of confining pressure of 300 kPa, the consolidation ratio of 1.5 and dynamic stress ratio of 0.4, the residual strain of PFA with a high content of 2% was 74% lower than that of rockfill at the same conditions. Thus, it is proved that the PFA can significantly reduce the residual deformation of the rockfill. The parameters in Sheng Zhujiang residual deformation model were also comparatively analyzed with the data of PFA-reinforced rockfill materials.
同期刊论文项目
同项目期刊论文
期刊信息
位置：