长江漫滩地区盾构磨桩穿越河堤影响性评价

Evaluation of the Impact of Shield Grinding Pile Crossing River Embankments in the Yangtze River Floodplain Area

文章针对南京地铁9号线白云亭站至三汊河站区间盾构磨桩穿越河堤的案例,采用数值模拟的方法对盾构磨桩穿越河堤进行影响性评价,提出精细化掘进控制措施,并对盾构掘进后河堤监测数据进行对比分析。结果表明:对河堤进行高压旋喷桩预加固,在盾构磨桩下穿河道期间对掘进参数、出土量和注浆措施提出精细化管控是有效的,最大沉降为10.2 mm,盾构磨桩穿越对河堤堤防影响较小。

In response to the case of shield grinding pile crossing river embankments between Baiyunting Station and Sanchahe Station on Nanjing Metro Line 9,numerical simulation was used to evaluate the impact of shield grinding pile crossing river embankments,propose refined excavation control measures,compare and analyze the monitoring data of the river embankments after shield tunneling.The results indicate that it is effective to pre-reinforce the river embankment with high-pressure rotating pile,and to propose refined control measures for excavation parameters,excavation volume,and grouting measures during the period of shield grinding pile crossing the river.The maximum settlement is 10.2 mm,and the impact of shield grinding pile crossing on the river embankment is relatively small.