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在天然冻土区或人工冻土工程中存在着大量冻土与结构物接触界面层问题,目前有关此类接触界面层力学变形性能的试验研究手段缺乏。为此,在已研制大型多功能冻土-结构接触面循环直剪系统DDJ-1基础上,改制冻土剪切盒,凸出冻土试样界面层,研发微变形测量系统,组成冻土与结构接触界面层力学试验系统。该系统不仅能实现不同边界条件下接触界面的力学特性试验,而且能测量和分析接触界面层不同位置的冻土体位移,分析研究不同冻土温度、不同结构粗糙度、不同法向荷载作用下界面层冻土体变形特性。试验结果表明,该系统能准确再现冻土与结构接触界面层的力学变形行为,可为系统开展冻土-结构接触界面层的研究提供试验基础。
In the natural frozen soil area or artificial frozen soil project there is a large number of frozen soil and structure contact interface layer problem, the current experimental study on the mechanical properties of such contact interface layer lack of means. Therefore, on the basis of DDJ-1, a large-scale multi-function frozen soil-structure contact cycle direct shear system has been developed, the permafrost shear casing was modified to protrude the interfacial layer of the frozen soil sample, the micro deformation measurement system was developed, Mechanics test system in contact with structure. The system can not only test the mechanical properties of the contact interface under different boundary conditions, but also measure and analyze the displacement of the frozen soil at different positions of the contact interface layer. The effects of different frozen soil temperature, different structural roughness and different normal loads Deformation characteristics of interface soil frozen soil. The experimental results show that the system can accurately reproduce the mechanical deformation behavior of the contact interface layer of frozen soil and structure, which can provide experimental basis for the study of the system of the frozen soil-structure contact interface layer.