混凝土黏结面应力-渗流耦合试验装置研制及应用

针对新老混凝土黏结面或混凝土与其它介质黏结面大都受到正应力作用的情况，研制了混凝土黏结面应力-渗流耦合试验装置，介绍了装置的主要功能、技术参数、系统组成及关键技术；采用该装置对四组钢板与混凝土黏结面进行了抗渗试验，获得了不同粗糙度的钢板与混凝土黏结面的渗透特性。试验结果表明，该装置完全能够保证测试需要的轴压和水压稳定，提出的电阻法测试渗透锋面的方法是可行的；钢板与混凝土黏结面具有良好的抗渗性能，采用钢质接茬板可保证井壁接茬的密封性能满足要求；在相同轴向应力状态下，钢板与混凝土黏结面的渗透系数大小与钢板表面粗糙度有关，钢板表面粗糙度越大，黏结面的渗透系数越小；装置具有较好的实用性和可靠性，为进一步研究应力作用下混凝土本体、新老混凝土黏结面以及混凝土与其它介质黏结面的渗透特性提供新的测试手段。

Development of test equipment for coupling stress-seepage on concrete adhesive interface

In terms of the situation that the adhesive interfaces between new concrete and old concrete or between concrete and other media are mostly under normal stress，the coupling stress seepage test equipment on concrete adhesive interface has been developed in this study.This paper will present the main functions，technical parameters，equipment system，key technologies and test results.The anti penetrating test on four groups of the adhesive interfaces between steel plate and concrete was conducted using this newly developed equipment，and the permeability of adhesive interfaces between concrete and different roughness steel plate was obtained.Test results show that the test equipment can provide stable vertical pressure and water pressure needed for the test；and the resistance measurement of infiltration frontal area method proposed is feasible.The impermeability on the interface between concrete and steel plate is good and meets the requirement of waterproof lining.Under the condition of the same axial stress，the permeability coefficient of the adhesive interfaces between steel plate and concrete is related to the roughness of steel surface，more the roughness of steel surface，smaller the permeability coefficient.The equipment has good usability and reliability，and provides a new mean for testing the permeability of the concrete noumenon and adhesive interfaces between new concrete and old concrete or between concrete and other media under stress.