高水压下叠合装配式管廊节点的抗渗性能试验研究

Experimental study on impermeability of prefabricated composite pipe gallery joints under high water pressure

为研究灾后综合管廊节点处的抗渗性能,制备了不同叠合装配形式及不同止水板构造的管廊节点试件,并进行三点抗弯开裂试验、自平衡式抗渗试验及抗弯承载力试验,并分析不同装配形式及止水板构造下的渗水规律及抗渗效果。研究表明:止水钢板的构造能满足防水防渗要求,且对极端灾害裂缝发展后的防水防渗有一定限制作用,但是增加现有规范规定的止水钢板长度300~400 mm,对抗渗性能无明显提升影响;初裂荷载与峰值荷载的比值越大,渗透深度与初始裂缝的比值越大,两者存在一定线性相关关系。

In order to study the impermeability of the prefabricated composite pipe gallery joints after the disaster,the pipe gallery joint specimens with different composite assembly forms and different stagnant water steel plates were made.The three-point bending cracking test,the balanced permeability test and the flexural bearing capacity test were carried out.Moreover,the seepage law and anti-seepage effect of different assembly forms and stagnant water steel plate structures were analyzed.The study shows that the structure of stagnant water steel plate can meet the requirements of waterproof and seepage control,and has a certain limit on the waterproof and seepage control after the development of extreme disaster cracks,but increasing the length of stagnant water steel plate specified in the existing specifications 300 mm to 400 mm,the anti-seepage performance has no significant impact.The greater the ratio of initial crack load to peak load,the greater the ratio of penetration depth to initial crack,and there is a certain linear correlation between them.