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为了研究冻土-混凝土接触面的力学特性,开发了一种低温动荷载直剪仪,它是在普通直剪仪框架的基础上,安装了动力加载系统和温度控制系统。该装置能够保证在负温条件下对冻土进行动荷载直剪试验,从而测定冻土的动力学参数。为了研究寒区冻土与混凝土构筑物的相互作用,使用该仪器进行了一系列的多因素接触面动直剪试验,试验结果表明了冻土-混凝土接触面在动荷载作用下的行为特征,多因素对比试验则揭示了接触面动剪强度的影响因素和变化规律。
In order to study the mechanical properties of the frozen soil-concrete interface, a low-temperature dynamic load-shear device has been developed. It is based on the ordinary direct shear device framework and is equipped with a dynamic loading system and a temperature control system. The device can guarantee the dynamic load direct shear test of frozen soil under the condition of negative temperature so as to measure the dynamic parameter of frozen soil. In order to study the interaction between the frozen soil and the concrete structure in cold region, a series of dynamic direct shear tests of the multi-factor contact surface were carried out by using the instrument. The experimental results show that the behavior of the frozen soil-concrete interface under the action of dynamic load Factors contrast test reveals the contact surface dynamic shear strength of the influencing factors and changes.