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渠道下卧土-混凝土衬砌冻结接触面直剪试验研究
引用本文:章赛泽 ?,卞汉兵,董小花,孙兆辉,韩慧敏,邱秀梅.渠道下卧土-混凝土衬砌冻结接触面直剪试验研究[J].南水北调与水利科技,2017,15(5):164-169.
作者姓名:章赛泽 ?  卞汉兵  董小花  孙兆辉  韩慧敏  邱秀梅
作者单位:1. 山东农业大学 水利土木工程学院,山东 泰安,271018;2. 山东农业大学 水利土木工程学院,山东 泰安 271018;LEM3,CNRS7239,洛林大学,梅兹 法国 57045;3. 滨州市小清河管理局,山东 滨州,256600
基金项目:国家科技支撑计划项目(2015BAB07B00)
摘    要:为研究渠道下卧土-混凝土衬砌冻结接触面抗剪强度及其随主要影响因素的变化规律,采用直剪仪开展了不同含水率、冻结温度、法向应力及冻结时间条件下渠道下卧土-混凝土衬砌冻结接触面直剪试验研究。结果表明:剪切的初始阶段,接触面存在局部剪应力释放现象,释放量大小受土体含水率、法向应力、冻结时间因素影响,但不受冻结温度的影响;在本试验参数范围内,接触面峰值抗剪强度随着土体含水率、法向应力、冻结时间的增加而增大,随冻结温度的降低而增大;接触面的抗剪强度实质上是冻土中的冰晶与混凝土衬砌接触面之间的胶结力,以及土体与混凝土衬砌接触面之间的黏聚力与摩擦力;峰值抗剪强度大小主要受胶结力影响;黏聚力和摩擦力主要受法向应力、冻结时间的影响。

关 键 词:接触面  冻结  抗剪强度  下卧土  混凝土衬砌  剪应力

A study on direct shear tests of frozen interface between channel bed soil and concrete lining
ZHANG Sai-ze,BIAN Han-bing,QIU Xiu-mei,SUN Zhao-hui,HAN Hui-min.A study on direct shear tests of frozen interface between channel bed soil and concrete lining[J].South-to-North Water Transfers and Water Science & Technology,2017,15(5):164-169.
Authors:ZHANG Sai-ze  BIAN Han-bing  QIU Xiu-mei  SUN Zhao-hui  HAN Hui-min
Affiliation:1. College of Water Conservancy and Civil Engineering,Shandong Agricultural University, Taian 271018, China; 2. LEM3 CNRS7239, Uniersité de Lorraine, 57045 Metz, France
Abstract:In order to study the shear strength of the frozen interface between the underlying soil and concrete lining of channels and its variation with the main influencing factors,we conducted a series of direct shear tests on the frozen interface between the underlying soil and concrete lining of channels.In these tests,the main influencing factors,such as soil moisture content,freezing temperature,normal stress level,and freezing time,were taken into consideration and then analyzed in detail.The experimental results showed that there was a phenomenon of local shear stress release at the interface at the initial stage of the shear tests,and the release amount was influenced by normal stress,soil moisture content,and freezing time,but not affected by the imposed freezing temperature.Within the parameters scopes of these tests,the peak shear strength would increase with the increase of soil moisture content,normal stress,freezing time,and the decrease of freezing temperature.Essentially,the shear strength of the interface was the cementation force between the ice in the frozen soil and concrete lining,and the cohesive force and friction force between the underlying soil and concrete lining.The peak shear strength was mainly affected by cementation force.The cohesive force and friction force was mainly affected by normal stress and freezing time.
Keywords:interface  frozen  shear strength  underlaid soil  concrete lining  shear stress
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