多维荷载对不同含水率混凝土渗透性的影响

为研究多维荷载对不同含水率混凝土渗透性影响,利用ZYS-1煤岩多功能三轴渗透仪进行不同试验条件下三轴渗透性试验,研究了轴压、围压、孔隙压上升过程中渗透系数的变化趋势,并分别得出渗透系数特征曲线。试验结果表明:混凝土的渗透系数与轴压、围压呈负指数的关系;混凝土渗透系数对围压的敏感性更高,在围压较低时混凝土的渗透系数随围压变化较快;在围压或轴压的作用下,混凝土的渗透系数趋于稳定时,混凝土的渗透系数随着其含水率的增加呈现递减趋势且对混凝土含水率的敏感度逐渐降低。上述研究成果对研究和提升混凝土的耐久性具有重要意义。

Effect of Multidimensional Load on Permeability of Concrete with Different Moisture Content

The effect of multidimensional load on the permeability of concrete of varied water content is examined in this research by using ZYS-1 coal-rock multifunctional triaxial infiltration apparatus under different test conditions. The change trend of permeability coefficient during the climbing of axial compression, confining pressure, and pore pressure are analyzed, and the curves of permeability coefficient under such conditions are acquired respectively. Results illustrate that the permeability coefficient of concrete is in a negative exponential relationship with axial pressure and confining pressure, but is more sensitive to confining pressure, which is reflected in the swift change of permeability coefficient in the presence of low confining pressure. Under the action of confining pressure or axial compression, the permeability coefficient of concrete tends to be stable, and decreases with the increase of water content and gets less sensitivity to water content. The research findings are of great significance to enhancing the durability of concrete and the long-term performance of bridges.