水压力环境中混凝土的含水量及其对力学性能的影响

发布时间：2018-06-13 09:02

本文选题：混凝土 + 水压力环境　；参考：《水利学报》2017年02期

【摘要】：为研究有压水环境中混凝土的含水量特征及孔隙水对混凝土力学性能的影响,通过试验获得了混凝土在水压力下的含水量曲线,并基于细观管道孔隙网格模型探讨了水压力变化对含水量和孔隙水分布的影响,进一步分析了混凝土含水量和孔隙水尺度对其静动态力学性能的作用机理。结果表明:混凝土含水量随水压力提高而增加,但水压力超过一定值后,含水量的增幅不显著;在高水压力下混凝土的孔隙水流动空间减少,且部分孔隙水具有更小的尺度,在动态荷载作用下孔隙水将产生显著的黏滞应力和超孔隙水压力,导致混凝土强度随应变速率提高呈非线性增长,但水压力对强度的影响不显著。简言之,水压力环境中混凝土的力学性能不仅与含水量和加载速率有关,还与孔隙水的尺度密切相关。
[Abstract]:In order to study the water content characteristics of concrete in pressurized water environment and the influence of pore water on the mechanical properties of concrete, the water content curve of concrete under water pressure was obtained by experiments. Based on the mesoscopic pore mesh model, the influence of water pressure on water content and pore water distribution is discussed, and the mechanism of concrete water content and pore water scale on its static and dynamic mechanical properties is analyzed. The results show that the water content of concrete increases with the increase of water pressure, but when the water pressure exceeds a certain value, the increase of water content is not significant, and the pore water flow space of concrete decreases under high water pressure, and some pore water has a smaller scale. Under dynamic load, pore water will produce significant viscous stress and excess pore water pressure, which leads to the nonlinear increase of concrete strength with the increase of strain rate, but the effect of water pressure on strength is not significant. In short, the mechanical properties of concrete under water pressure are related not only to the water content and loading rate, but also to the scale of pore water.
【作者单位】：西安理工大学土木建筑工程学院;三峡大学土木与建筑学院;
【基金】：国家自然科学基金项目(51279092) 水利部公益性行业科研专项(201501034-03)
【分类号】：TU528

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