城市轨道交通隧道下穿既有高架线风险评估

The Risk Assessment of the Urban Rail Transit Tunnel Engineering under Viaduct Structure

对北京地铁15号线矿山法隧道工程下穿既有地铁5号线高架结构进行风险评估,明确了该高架结构的重要性等级为Ⅰ级。根据高架结构现状调查和结构检测,评定其安全性等级为良好。通过三维数值模拟,研究既有高架结构的受影响程度,评定为严重。该既有线高架结构风险发生的可能性为可能发生,其工程环境风险等级为一级。施工过程严格执行相关方案,监测结果表明高架结构和轨道结构的变形满足控制要求,既有线安全运营未受到影响。该工程既有高架结构的风险评估和控制工作,可作为类似工程的参考。

The project of Beijing subway Line 15 tunnel engineering under viaduct structure is given to risk assessment.The importance grade of the viaduct structure is Grade I.According to the investigation and the structure inspection,its safety grade is good.By the three-dimensional numerical simulation,its affected grade is assessed as serious level.There is the possible risk in the existing viaduct structure.Its environmental risk grade is Grade I.The construction scheme is taken strictly during the construction process.The monitoring results show that the deformation of viaduct and rail are in the control.The safety operation of existing line is not affected.The risk assessment and control of the viaduct structure can be used as a reference in similar engineering