模型材料的制备是开展结构模型试验的重要组成部分,为探究模型材料中各因素对物理力学性能参数的影响,采用正交试验设计材料配比,应用三轴仪等设备得到模型材料力学参数,并通过对模型材料物理力学性能进行敏感性分析,得到了材料骨胶比、水泥石膏比、砂重晶石粉比、精铁粉量、砂粒径等影响因素的敏感度,建立了基于敏感性分析的水工结构模型材料配置方法。以某胶凝砂砾石(CSG)坝为原型,依托上述模型材料试验方法,得到CSG坝结构模型,采用超载法对模型进行破坏试验研究,并与有限元成果进行对照,得到了坝体沿建基面贯通裂缝滑动的破坏模式,较好模拟了CSG坝的真实破坏情况,表明了所得材料物理力学性能参数受材料配比因素影响结果的可靠性。
Abstract
The preparation of model materials plays a crucial role in structural model test. To investigate the impact of various factors on the physical and mechanical properties of model materials, we employed orthogonal test to design the material proportions, and obtained the mechanical parameters of the model materials using a triaxial test apparatus. By conducting sensitivity analysis on the physical and mechanical properties of the model materials, we determined the influences of factors such as the aggregate-binder ratio, cement-gypsum ratio, sand-barite powder ratio, refined iron powder amount, and sand particle size. Based on the sensitivity analysis, we obtained a preparation method for hydraulic structure model materials. Taking a cementitious sand gravel (CSG) dam as a prototype, we created a structural model of the CSG dam using the aforementioned material preparation method and conducted failure test on the model using overload method. The obtained failure model, which involves sliding of the dam body along penetrative cracks along the foundation surface, is compared with finite element results. This model better simulates the actual failure of the CSG dam, demonstrating the reliability of our findings: physical and mechanical parameters of model materials are affected by material proportion factors.
关键词
相似材料 /
正交试验 /
三轴抗剪试验 /
敏感性分析 /
胶凝砂砾石坝模型
Key words
similar materials /
orthogonal test /
triaxial shear test /
sensitivity analysis /
model of cementitious sand gravel dam
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基金
国家自然科学基金青年基金项目(52109154)
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