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台后预顶技术是指为了减少拱桥桥台水平位移而在拱桥施工过程中预先在桥台台后进行预顶的一项技术。通过预顶,使拱脚及群桩基础向河心侧预偏一定位移,从而改善主拱圈结构受力,以及增大群桩基础抗水平推力的能力;同时使阻滑板抗推结构向台后预位移,从而增强了阻滑板抗推能力的发挥。土体蠕变效应是影响该技术使用效果的主要因素,本文主要针对土体蠕变效应问题进行研究。研究过程中,通过监测阻滑板和桥台位移,得到拱桥阻滑板基础下土体蠕变位移值;并采用Burgers体模型拟合观测数据,预测未来土体蠕变量,计算阻滑板剩余推力。研究结果表明,阻滑板剩余的水平推力较大。从现有研究结果来看,台后预顶技术运用于该类型拱桥效果较好。
Pre-stage technology behind the stage is in order to reduce the horizontal displacement of the arch bridge abutment in the arch bridge construction in advance in the bridge abutment after a pre-top technology. Through the pre-top, the base of the arch foot and the group pile are pre-deflected to the center of the river to improve the stress of the main arch ring structure and increase the ability of the pile foundation to resist the horizontal thrust. At the same time, Displacement, thereby enhancing the anti-sliding skateboarding ability to play. Soil creep effect is the main factor that affects the use effect of this technology. This paper mainly studies the creep effect of soil. In the process of research, the creep displacement of soil mass under the skid plate of the arch bridge was obtained by monitoring the displacement of the skid plate and the abutment. The Burgers body model was used to fit the observed data to predict the future soil creep and to calculate the residual thrust of the skid plate. The results show that the remaining level of skateboard thrust greater thrust. Judging from the existing research results, the application of Taiwan’s top pre-top technology to this type of arch bridge works well.