不同荷载作用下塑性混凝土渗透性试验研究

Experimental study on permeability of plastic concrete under different load levels

基于达西定律,采用稳态水流测量方法探讨了塑性混凝土在荷载不变和荷载逐渐提高两种条件下的渗透性能,及其随荷载和自身内部裂隙变化的规律。研究发现,荷载不变且不产生破坏时,塑性混凝土的渗透系数基本保持稳定;当荷载逐渐增大直至塑性混凝土破坏,渗透系数在应力比η小于30%时略有降低,在η为30%~60%之间时明显减小,在η大于60%时开始增加,当η达到80%之后显著增加。

Permeability of plastic concrete under the two conditions,including the same load level and increasing load level with time,was investigated using the steady state flow measurement method based on Darcy＇s Law,and the relationships between the permeability and load and between the permeability and internal crack were analyzed.The results showed that when load is constant and the plastic concrete sample is not destroyed,the permeability coefficient remains stable;while load increases step by step until the sample is destroyed,the permeability coefficient reduces slightly when stress ratio（η）is less than 30%,reduces significantly whenηis between 30%to 60%,begins to increase whenηis greater than 60%,and increases remarkably whenηreaches 80%.