渠道下卧土-混凝土衬砌冻结接触面直剪试验研究

发布时间：2018-12-30 15:32

【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。
[Abstract]:In order to study the shear strength of frozen contact surface of soil concrete lining under canal and its variation with main influencing factors, different moisture content and freezing temperature were carried out by means of direct shear apparatus. Direct shear test of frozen contact surface between soil and concrete lining under the condition of normal stress and freezing time. The results show that at the initial stage of shear, the local shear stress release exists on the contact surface, and the amount of release is affected by soil moisture content, normal stress, freezing time, but not by freezing temperature. In the range of test parameters, the peak shear strength of contact surface increases with the increase of soil moisture content, normal stress and freezing time, and increases with the decrease of freezing temperature. The shear strength of contact surface is essentially the cementing force between ice crystal and concrete lining interface in frozen soil, and the cohesion and friction force between soil and concrete lining interface, and the peak shear strength is mainly affected by cementing force. Cohesion and friction are mainly affected by normal stress and freezing time.
【作者单位】：山东农业大学水利土木工程学院;LEM3 CNRS7239 洛林大学;滨州市小清河管理局;
【基金】：国家科技支撑计划项目(2015BAB07B00)~~
【分类号】：TV32

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