京沪高速铁路南京大胜关长江大桥桥墩局部冲刷及岸坡防护研究

Research of Pier Local Scouring and Bank Slope Protection for Nanjing Dashengguan Changjiang River Bridge on Beijing-Shanghai High Speed Railway

京沪高速铁路南京大胜关长江大桥南岸坡度在1∶2左右,处于长江沿岸稳定边坡的临界状态。通过建立1∶100大比例尺正态局部河段物理模型,研究了桥墩局部冲刷坑大小尺寸,特别是南辅助墩冲刷范围,以及桥墩局部冲刷对南岸岸坡稳定产生的影响。结果表明:南辅助墩岸坡处于不稳定状态,需进行防护。同时对防护方案进行了分析。

The south bank slope of Nanjing Dashengguan Changjiang River Bridge on Beijing- Shanghai High Speed Railway is in the ratio of about 1：2 and is in a critical state of stable slopes along banks of the River. In this paper, by setting up a 1：100 large scale normal physical model of local stream segment, the sizes of the local scouring pits around the Bridge piers have been researched, particularly the scouring range of the south auxiliary piers and influences of the pier lo cal scouring on the south bank slope stability. The results show that the bank slope near the south auxiliary piers are in the state of unstable conditions, the slope needs to be protected and meanwhile, the protection scheme for the slope is analyzed.