地铁盾构下穿高速铁路桥梁结构安全性评估研究-《高速铁路技术》

文章信息/Info

Title:: Study on Structural Safety Assessment of Subway Shield underneath Passing High-speed Railway Bridge

摘要:: 随着我国高速铁路和轨道交通基础设施的大规模发展，新建地铁采用盾构形式下穿高速铁路桥梁的情况越来越多，需对既有高速铁路桥梁变形和结构进行安全评估。文章以某地铁盾构下穿高速铁路为例，介绍了对既有高速铁路桥梁结构安全性进行评估的思路：以规范为依托，以数值分析为手段，从桩基强度、桩基承载力、桥墩变形三个方面计算盾构施工对既有桥梁桩基的附加影响，进而对既有桥梁结构的安全性进行评估，得出评估结论及建议。

Abstract:: With the large-scale development of China’s high-speed railway and rail traffic infrastructure, there are more and more new subways underneath passing the high-speed railway bridges with shield construction method, so it is necessary to assess the existing high-speed railway bridge deformation and structure. Taking a certain subway shield underneath passing the high-speed railway as an example, the thought of safety assessment of the existing high-speed railway bridge structure is introduced in this paper, and the additional impacts of shield construction on the existing bridge pile foundations are calculated from three aspects of pile base strength, pile base bearing capacity and the pier deformation by means of numerical analysis relying on the specification, and then the security of the existing bridge structure is assessed and conclusions and the recommendations are obtained.