限界精确计算在地铁工程设计及施工处理中的应用研究

Research on the application of precise clearance calculation in metro engineering design and construction process

GB 50157-2013《地铁设计规范》与TB 10003-2016《铁路隧道设计规范》均适用于地铁缓和曲线地段限界加宽计算。通过研究2种规范中缓和曲线地段限界加宽值的差异及变化规律,可知GB 50157-2013《地铁设计规范》对缓和曲线地段限界加宽计算结果更为精确。结合工程实际,在应用GB 50157-2013《地铁设计规范》中的缓和曲线计算办法时,提出在缓和曲线地段限界设计中采用分段加宽方法,以便设计施工。在施工处理中,建议按缓和曲线精确计算结果进行现场核对,从而进一步减少施工整改工程量及难度。此外,针对圆曲线与直线直接相连线路工况下的限界加宽办法,文章提出采用线性插值法计算,并在施工处理中得到良好的应用效果,通过对限界精确计算研究,为后续工程建设提供参考。

The GB 50157-2013"Code for Design of Metro"and TB 10003-2016"Code for Design of Railway Tunnel"are both applicable to the calculation of clearance widening in metro transitional curve sections.By studying the differences and variation patterns of the clearance widening values in the transitional curve section between two standards,it can be concluded that GB 50157-2013"Code for Design of Metro"provides more accurate calculation results for the clearance widening in the transitional curve section.Based on engineering practice,when applying the transitional curve calculation method in GB 50157-2013"Code for Design of Metro",it is proposed to use segmented widening in the clearance design of transitional curve sections for design and construction purposes.In construction processing,it is recommended to accurately calculate the results according to the transitional curve for on-site verification,in order to further reduce the amount and difficulty of construction re-work.In addition,for the widening method of the clearance under the condition of directly connecting situations between circular curves and straight lines,the article proposes the use of linear interpolation method for calculation,and has achieved good application results in construction processing.Through accurate calculation research of the clearance,it provides reference for subsequent engineering construction.