大型渡槽桩土相互作用振动台试验研究

Shaking Table Test on Soil-pile Interaction of Large Aqueducts

为了对南水北调中线工程中的洺河大型渡槽下部结构型式及优化设计各备选方案进行初步的评估,总结其地震反应的规律,获得必要的动力反应设计参数,分别对等长桩、不等长桩以及旋喷加固等长桩进行了振动台试验研究。根据所得试验数据,对等长桩和不等长桩2种不同设计方案下的动力反应特性进行了分析,对使用旋喷加固方法对桩基动力反应的影响进行了初步的判断,并对试验中使用的木-橡胶模型箱进行了评估。试验结果表明:采用长短桩设计方案比不等长桩更具优越性;使用旋喷加固方法能在一定程度上提高桩基动力反应的安全性;试验中所使用的木-橡胶模型箱在土的边界模拟上是合理和可行的。

Shaking table tests were carried out for Minghe River Aqueduct in South-to-North Water Diversion Central Line Project. Based on the data of the tests, dynamic response characteristics were analyzed for two different design alternatives, which were equal length pile foundation and Unequal length pile foundation. The effect was initially estimated on the dynamic response of pile foundation when circle spray reinforcement was used. And wood-rubber model box was objectively evaluated in the tests. It is shown that unequal length pile design alternative is more appropriate than equal length pile. Moreover, circle spray reinforcement can improve the behavior of dynamic response of pile foundation and wood-rubber model box is rational and feasible.