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在天然冻土区和人工冻土工程中存在着大量冻土与结构物接触面问题,而目前尚无有关此类接触面剪切行为的试验研究手段。为此,研制了大型多功能冻土–结构接触面循环直剪系统DDJ—1,该系统性能优异:能实现0～-20℃范围内对接触面温度的精确控制;能精确施加常刚度、常位移、零法向应力和常应力4种法向边界条件;能够模拟多种粗糙度的接触面实现循环和单调两种剪切形式;能够观测接触带的破坏状态和厚度,同时可以测量接触带土体内部的剪切位移;应力施加、位移控制和温度调节精准。试验结果表明:该系统能准确地再现冻土与结构接触面的力学行为、变形行为,可为系统开展冻土–结构接触面的研究提供试验基础和重要思路。
In the natural frozen soil area and artificial frozen soil project there is a large number of frozen soil interface problems, and there is no experimental study of such contact surface shear behavior. For this reason, the DDJ-1, a large-scale, multi-functional frozen soil-structure interface cycling direct shear system, has been developed. This system has excellent performance: it can precisely control the contact surface temperature within the range of 0 ~ -20 ℃; Normal displacement, zero normal stress and normal stress. It can simulate the contact surface of many kinds of roughness to realize two kinds of circular and monotonous shearing forms. It can observe the damage state and thickness of the contact zone and measure the contact With shear displacement within the soil; stress application, displacement control and temperature control precision. The experimental results show that the system can accurately reproduce the mechanical behavior and deformation behavior of the contact surface between the frozen soil and the structure, and provide the experimental basis and important ideas for the study of the system on the frozen soil-structure contact surface.