水压下单裂隙开裂混凝土渗透试验及模型公式研究

Study on Permeability Test and Model Formula of Single Cracked Concrete underWater Pressure

为了研究开裂混凝土的渗透特性,通过室内试验研究了裂缝宽度、外水压力对开裂混凝土渗透特性的影响,总结了目前开裂混凝土理想光滑平行裂缝模型和考虑粗糙度影响裂缝模型的绝对渗透系数计算公式,并将试验获得的渗透系数与各理论模型的计算结果进行分析比较。研究表明:裂缝宽度对混凝土结构渗透性影响最大,符合立方定律函数关系,水压、渗透时间与渗水量符合线性增长函数关系;比较试验结果和各理论模型发现,绝对渗透系数试验值拟合曲线与裂缝三次方公式曲线拟合较符合,建议作为开裂混凝土渗透系数的理论依据。

In order to study the permeability characteristics of cracked concrete,effects of crack width and external water pressure on the permeability characteristics of cracked concrete were studied through laboratory tests.Formulas for calculating the absolute permeability coefficients of cracked concrete in the ideal smooth parallel crack model and the model considering the effect of roughness were summarized.The permeability coefficients obtained from the tests were analyzed and compared with the calculated results of each theoretical model.It is shown that crack width has the greatest influence on the permeability of concrete structure,which is in accordance with the cubic law function relationship.In addition,water pressure,penetration time and water penetration amount are in line with the linear growth function relationship.Comparing the test results and each theoretical model,it was found that the fitted curve of the absolute permeability coefficient test value was consistent with the cubic fitted curve of the crack,which was recommended as the theoretical basis for the permeability coefficient of cracked concrete.