中文摘要：

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。

英文摘要：

This paper presents a study on the water content characteristic and the influence of pore wateron mechanical properties when concrete under water pressure environment. The test was carried out to ob-tain curves of water content for concrete under different water pressure, and influence of water pressurevariation on water content and distribution of pore water was discussed based on the mesoscopicalpipe-pore network model. Furthermore, mechanism for effect of water content and scale of pore water onthe static and dynamic mechanical properties of concrete was analyzed. The results show that water contentof concrete increases with increasing water pressure, while water pressure exceeds a certain value, the in-crease of water content is insignificant; under high water pressure, the pore space in concrete is less forwater to flow and a portion of pore water is on smaller scale,which resulting in greater viscous stress andexcess pore water pressure when concrete under the dynamic loading, and these can lead to the nonlinearincrease for the strength of concrete as strain rate rises. However, the strength of concrete is not affectedby water pressure. In conclusion,the mechanical properties of concrete are not only related with water con-tent and loading rate,and but also closely related to the scale of pore water.