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冰川冻土 ›› 2018, Vol. 40 ›› Issue (3): 556-562.doi: 10.7522/j.issn.1000-0240.2018.0060

• 寒区科学与技术 • 上一篇    下一篇

盐渍化冻土-混凝土衬砌接触面直剪试验研究

孙兆辉1, 卞汉兵1,2, 鹿翔宇1, 章赛泽1, 邱秀梅1   

  1. 1. 山东农业大学 水利土木工程学院, 山东 泰安 271018;
    2. 洛林大学 微观结构与材料力学实验室, 法国 梅兹 57045
  • 收稿日期:2017-11-03 修回日期:2018-02-22 出版日期:2018-06-25 发布日期:2018-07-16
  • 通讯作者: 邱秀梅,E-mail:qxmxr@126.com E-mail:qxmxr@126.com
  • 作者简介:孙兆辉(1991-),男,山东泰安人,2015年在中南林业科技大学获学士学位,现为山东农业大学在读硕士研究生,从事盐渍土、冻土力学性质方面的研究.E-mail:Mrsunzhaohui@163.com
  • 基金资助:
    国家十二五科技支撑计划项目“南水北调平原水库运行期健康诊断及防护技术研究与示范”(2015BAB07B05);山东省重点研发计划项目“渠道衬砌冻融破坏机理与工程防治措施研究”(2017GSF16104)资助

Direct shear tests of interface between salinized frozen soil and concrete lining

SUN Zhaohui1, BIAN Hanbing1,2, LU Xiangyu1, ZHANG Saize1, QIU Xiumei1   

  1. 1. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an 271018, Shandong, China;
    2. Laboratory for the Study of Miscorstructures and Materials Mechanics, Université de Lorraine, Metz 57045, France
  • Received:2017-11-03 Revised:2018-02-22 Online:2018-06-25 Published:2018-07-16

摘要: 土与结构接触面的研究一直以来是岩土工程研究的热点之一。为研究位山灌区渠系工程冻害破坏问题,开展了不同盐类型、不同含盐量、不同含水率条件下渠道下卧盐渍土-混凝土衬砌冻结接触面直剪试验研究。结果表明:冻结状态下接触面的应力-位移破坏性状呈脆性破坏,存在明显的峰值应力;剪切变形包括线性变形和非线性变形,线性变形随含水率和含盐量的增大而减小,非线性变形随含盐量的增大而增加;剪切模量随含水率的增加而提高;随含盐量的增加而降低;抗剪强度随含水率的增加而增大,随NaCl含盐量增加而降低,随Na2SO4含盐量增加先降低后升高;通过对变形能的分析发现,含水率w=14.7%和w=16.7%时具有相似特征,即NaCl含量为0.5%时,曲线存在极(最)小值。

关键词: 盐渍土, 混凝土衬砌, 冻结, 接触面, 抗剪强度

Abstract: The study of interface between soil and structure has been one of the hot spots in geotechnical engineering research. In order to study the frost damage of canal system in Weishan irrigation district, under the conditions of different salt species, different salt content and different water content, a series of direct shear tests for frozen interface between saline soil and concrete lining have been performed to study the mechanical properties of the frozen interface. The results show that failure model of frozen interface was brittle and an obvious peak stress could be observed. The shear deformation includes linear deformation and nonlinear deformation. The linear deformation decreases with the increase of water content and salt content, and the nonlinear deformation increase with the increase of salt content. The shear modulus increases with the increase of water saturation and decreases with the increase of NaCl concentration. The shear strength increases with the increase of water saturation, decreases as the salt content increases with NaCl, while it decreases first and increases as the salt is Na2SO4. Through the strain energy analysis, it is found that the characteristics of frozen interface with water content w=14.7% and w=16.7% are similar, that means when the NaCl content is 0.5% the shear strength is minimum.

Key words: saline soil, concrete lining, frozen, interface, shear strength

中图分类号: 

  • TU411.7