›› 2017, Vol. 38 ›› Issue (7): 1863-1868.doi: 10.16285/j.rsm.2017.07.003

• 基础理论与实验研究 • 上一篇    下一篇

高聚物胶凝堆石料动残余变形特性试验研究

刘汉龙1, 2,刘 平3,杨 贵4,肖 杨1, 2,刘彦辰4   

  1. 1. 重庆大学 山地城镇建设与新技术教育部重点实验室,重庆 400045;2. 重庆大学 土木工程学院,重庆400045;3. 鲁东大学 土木工程学院,山东 烟台 264025;4. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098
  • 收稿日期:2015-09-09 出版日期:2017-07-10 发布日期:2018-06-05
  • 作者简介:刘汉龙,男,1964年生,教授,博士生导师,主要从事土动力学与地基基础工程和研究工作
  • 基金资助:

    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)。

Experimental investigations on dynamic residual deformation behaviors of PFA-reinforced rockfill materials

LIU Han-long1, 2, LIU Ping3, YANG Gui4, XIAO Yang1, 2, LIU Yan-chen4   

  1. 1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China; 2. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 3. College of Civil Engineering, Ludong University, Yantai, Shandong 264025, China; 4. Key Laboratory for Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2015-09-09 Online:2017-07-10 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(51479059), the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT1125) and the Foundation for Docotors of Ludong university (2016009).

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。

关键词: 堆石料, 高聚物, 动三轴试验, 动残余变形, 抗震措施

Abstract: 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 firstly 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.

Key words: rockfill materials, polyurethane foam adhesive (PFA), dynamic triaxial tests, dynamic residual deformation behaviors, aseismic measure

中图分类号: 

  • TU 411

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