土工合成材料双向拉伸多功能试验机的研制及初步应用

为揭示土工合成材料双向拉伸状态下的力学特性,自主研制了一台双向拉伸多功能试验机,能够进行瞬时和长期蠕变双向拉伸试验。瞬时拉伸采用电机控制,可以实现两个方向任意比例下应力和应变加载；蠕变拉伸采用法码加载,可同时进行3组大变形蠕变拉伸试验。经初步应用表明,该试验机能够进行复杂应力、应变路径下土工合成材料双向拉伸试验,为土工合成材料双向拉伸力学特性的研究提供了一种科学有效手段。

Development and application of multi-functional biaxial tensile testing machine for geosynthetics

A multi-functional biaxial tensile testing machine, which can be applied for both immediate and creep biaxial tension tests on geosynthetics, is designed and developed to investigate the mechanical propertes of geosynthetics under biaxial tension states. In immediate tension test mode, electro motors are used to apply tension force or displacement loads with different proportions in the two perpendicular directions. In creep tension test mode, the tension loads are applied by a set of iron weight. And three groups of large deformation creep tests can be carried out simultaneously using the machine. Preliminary experimental results show that the new machine can be employed to conduct biaxial tension tests on geosynthetics under implicit stress and strain paths. The new machine provides a scientific and effective means for studying the mechanical properties of geosynthetics under biaxial tension states.