沥青混凝土防渗面板滑动接头的试验研究

Experiment on sliding connection parts of asphalt concrete impervious facing

通过各种模型试验,对沥青混凝土面板在滑移过程中产生的应力和应变进行了研究。研究结果表明,BGB塑性垫层材料可在较小的滑动位移下对面板拉应力和拉应变进行调整,确保面板在滑移过程中不开裂。同时这种垫层材料对面板滑移速度和水压力大小均不敏感,这对于适应面板在各种情况下的滑移十分有利。由于面板在滑移中的破坏受面板内产生的拉应力控制,进行滑移垫层设计时应尽量减小面板中的拉应力。另外,采用这种垫层材料能确保沥青混凝土面板在1MPa的水压力和不大于0.76的滑移缝长比作用下不漏水。

Model tests are made to check the stress and strain of asphalt concrete facing during sliding. The test result show that BGB plastic cushion material can restrict the tensile stress and strain and prevent the facing from crack under a relatively small sliding displacement. BGB is not sensitive to sliding speed and water pressure, so it can suit various situations of facing. Because crack failure of the facing is governed by the aroused tensile stress, measures to reduce the tensile stress in designing cushion structures should be taken. In the end, the test showed that BGB cushion material can prevent the facing from leaking under the action of water pressure of 1.0MPa and sliding with its end displacement ratio to the length of cushion not larger than 0.76.