地铁区间下穿成绵乐高铁设计方案研究

Design of Subway Section Crossing under Chengdu-MianyangLeshan Intercity High Speed Railway

通过对地铁区间下穿高铁无砟轨道方案的研究,分析了地铁区间下穿未运营的高铁无砟轨道线路的可行性。以成都地铁4号线二期东延线万年场站—东三环站矿山法施工区间下穿即将运营的成绵乐城际高速铁路(无砟轨道)为例,通过与同类工程进行类比,并结合理论计算分析,综合评估了地铁下穿施工对高铁的影响。经与实际监测结果比较,证明设计方案是合理的,计算具有较高的可靠度。提出了对高铁的具体保护措施及沉降控制标准,为今后类似工程设计提供借鉴及参考。

The plan of subway section crossing under the bal- lastless track of high-speed railway is introduced, the feasibil- ity of this plan for not yet operated high-speed railway is an- alyzed. Based on the phase II of Chengdu Subway Line 4, the mining method adopted at the interval from Wannian Station to Dongsanhuan Station on the cast extension line is studied, which crosses under the ballastless track of Chengdu- Mianyang-Leshan Intercity High-speed Railway. Through comparison with similar projects and combined with theoreti- cal calculation, the impact of subway over the high-speed railway during its construction is comprehensively assessed. Compared with the actual monitoring data, it shows that the design plan is reasonable, the calculation has high reliability. Finally, specific protective measures and setlcment control standards are proposed for the high-speed railway, to provide a reference for the design of similar projects.